coal concepts proficiency testing general analysis … · coal concepts proficiency testing general...

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COAL CONCEPTS PROFICIENCY TESTING

GENERAL ANALYSIS SAMPLE

REPORT – ONE HUNDRED AND TWO

Revision 00

Final report

DATE ISSUED: 30 APRIL 2020

PARTICIPANT

SCHEME COORDINATOR: K MUNSAMY

SIGNATURE

CHECKED BY: R BABOOLAL (SCHEME MANAGER)

Disclaimer: Opinions and interpretations expressed herein are outside the scope of SANAS accreditation *Moisture in the analysis sample is not included in the SANAS schedule of accreditation as robust statistics cannot be applied.

Chlorine, Fluorine, Quick ash, ASTM ash and ASTM Volatiles is not included in the scope of accreditation.

THINKING QUALITY, QUALITY THINKING

REGISTRATION NUMBER: 2006/149731/23 (RMB INDUSTRIAL STATIONERS cc t/a)

81 CERAMIC CURVE, ALTON, RICHARDS BAY 3900 l TEL: +27(0)35 751 2446 l CEL: +27(0)83 6500151 l FAX: 0862605793

E-MAIL: [email protected] l [email protected]

LABORATORY CODE:

mailto:[email protected]

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EXECUTIVE SUMMARY

1. One hundred and ten samples were sent to participants with 87 timeous result submissions

2. The total number of outliers found were as follows (dry base):

• ISO Ash x 4

• ISO volatile matter x 4

• Calorific value x 1

• Total sulphur x 2

• Phosphorous in coal x 3

• Total Carbon x1

• Nitrogen x 1

• Ash fusion (softening) x 1

• Ash fusion (hemisphere) x 1

3. Chlorine, Fluorine, ASTM Ash, ASTM Volatile Matter, Carbon, Hydrogen and Nitrogen participants were insufficient to

warrant robust statistical calculations. 4. Trending for your laboratory is as follows:

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TABLE OF CONTENTS

ITEM

PAGE NUMBER

Letter to participant

4

List of participants

5

Type of sample used

6

Preparation of sample

6

Homogeneity check

6

Stability check

7

ISO Ash data

8

ISO Ash z-score trend

9

Quick Ash data 10

Quick Ash trend 11

ISO Volatile matter data

12

ISO Volatile matter z-score trend

13

Calorific value data

14

Calorific value z-score trend

15

Total sulphur data

16

Total sulphur z-score trend

17

Phosphorous data and Z-Score trend

18

Carbon data / Hydrogen data / Nitrogen data

19

AFT data and z-scores

20

ASTM Ash and ASTM Volatile matter, Chlorine & Fluorine 20

Conclusion

21

Terms & Conditions 22

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Dear Participant

RE: PROFICIENCY TESTING RESULTS FOR THE MONTH OF APRIL 2020 Thank you for your participation in the Coal Concepts proficiency testing scheme.

Your laboratory code is as per the cover page.

All results are totally confidential. Any results in Bold, Italics and Underlined are outliers. Where applicable, the most

extreme outliers have been eliminated from calculations using the Grubbs estimate for outliers. Robust statistics has

been applied where possible. Analysis results have been reported on air dry and dry base. The dry base results have

been used to calculate the z-scores.

Please take note of the following:

1. Z-scores between -1 and +1 is deemed acceptable

2. Z-scores between -2 and -3 should serve as a warning that the analysis result could get worse

3. Z-scores between +2 and +3 should also serve as a warning that analysis results could get worse.

4. Z- scores lower than -3 and exceeding +3 should warrant an investigation

5. Compare your result to the robust average which will be the assigned value. The measurement of uncertainty (UoM)

of the results is also stated.

6. All calculations can be made available upon request

The Coal Concepts scheme adheres to the requirements of ISO/IEC 17043:2010 – Conformity assessment – General

requirements for proficiency testing.

Statistical analysis has been carried out using ISO/IEC 13528:2015-Statistical methods for use in proficiency testing by

interlaboratory comparisons

Please find results attached together with Z-score trends.

Best Regards

R Baboolal

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LIST OF PARTICIPANTS IN ALPHABETICAL ORDER

Arcelor Mittal - Vanderbijl Park Arcelor Mittal - Newcastle

Anglo SOC - Goedehoop Colliery South Plant Anglo SOC - Goedehoop Colliery North Plant

Anglo SOC - Kleinkopje Colliery Anglo SOC - Greenside Colliery

Afrisam - Dudfield Alfred H Knight -Richards Bay Laboratory

Afrisam - Ulco AquaSpecto

Botswana Power Corporation - Morupule B Power Station Bureau Veritas Inspectorate Laboratories - Middelburg

Bureau Veritas – Moatize, Vale Bureau Veritas - Nacala

Bureau Veritas Inspectorate Laboratories - Tendele Bureau Veritas Inspectorate Laboratories - Beira

Bureau Veritas Inspectorate Laboratories - Alton Bureau Veritas Testing & Inspection SA - Pretoria

Bureau Veritas Inspectorate Laboratories - Belfast Cotecna South Africa - Nasonti

Cotecna South Africa - Lurco Cotecna South Africa - Phola

Cotecna South Africa – Tselentis Cotecna South Africa - Kangala

Cotecna South Africa - Middelburg Cotecna Ubumbene(Pty)Ltd - Umlabu

- Umlabu Cotecna South Africa - Mimosa Cotecna South Africa - VDD

Cotecna South Africa - Droogvallei Cotecna South Africa - AMR

Delmas Coal Eyethu Coal Mooifontein

Eyethu Coal Wilge Eskom Holdings SOC Ltd - Matimba Power Station

Eskom Holdings SOC Ltd – Kendal Power station Eskom Holdings SOC Ltd - Duvha Power Station

Eskom Holdings SOC Ltd – Lethabo Power Station Eskom Holdings SOC Ltd - Komati Power Station

Eskom Holdings SOC Ltd - Tutuka Power Station Eskom Holdings SOC Ltd - Grootvlei Power Station

Eskom Holdings SOC Ltd - ERID Eskom Holdings SOC Ltd - Kriel Power Station

Eskom Holdings SOC Ltd - Hendrina Power Station Eskom Holdings SOC Ltd – Majuba Power Station

Eskom Holdings SOC Ltd - Arnot Power Station Exxaro Resources - Grootegeluk Mine

Eskom Holdings SOC Ltd - Matla Power Station Eskom Holdings SOC Ltd – Medupi Power Station

Exxaro Resources - Matla Mine G&W Base & Industrial Minerals

Glencore Wonderkop Glencore -Rustenburg Smelter

Glencore Boshoek Smelter Glencore -Lydenburg Smelter

Glencore Lion Smelter Hwange Colliery – Zimbabwe

HighVeld Laboratories Idwala Lime

Intertek Mozambique Kangra Coal (Pty) Ltd

Jindal Mining SA Pty Ltd – Kiepersol Colliery Mpumamanzi Group CC

Khwezela Colliery - Landau Mafube Colliery Mine PTY (Ltd)

Lafarge Industries SA (Pty) Ltd - Lichtenburg Mitra SK South Africa (PTY) Ltd

Morupule Coal Mine - Botswana Noko Analytical Services CC - Welgemeend

Msobo Coal PTY Ltd Noko Analytical Services CC - Twistdraai

M L Coal PTY Ltd Quality Ensure Eastside Laboratory

Noko Analytical Services CC - Hakahno Ronewa Lab Middelburg

Noko Analytical Services CC - Witbank Ronewa Lab Ubuntu

Richards Bay Minerals Seriti - New Vaal Colliery

RSA Labs Siza Coal Services - Vlakfontein

Seriti - Kriel Colliery Siza Coal Services - Kinross

Siza Coal Services - Wescoal Siza Coal Services - NCC

Siza Coal Services - Botswana Siza Coal Services - Mooiplaats

Siza Coal Services - Middelburg Siza Coal Services - Sasolburg

Siza Coal Services - Carolina Siza Coal Services - NBC

Siza Coal Services - Wildfontein South 32 – Khutala Colliery

Siza Coal Services - Umlalazi Sibonisiwe Coal Laboratory Services CC - West Coal Processing

Sibonisiwe Coal Laboratory Services CC - Vaalbult Sibonisiwe Coal Laboratory Services CC – Mzimkhulu

Sibonisiwe Coal Laboratory Services CC SABS Commercial SOC Ltd Richards bay

Sibonisiwe Coal Laboratory Services CC – Elandsfontein SABS Commercial SOC Ltd Secunda

SABS Commercial SOC Ltd CSIR SABS Commercial SOC Ltd Springlake

SABS Commercial SOC Ltd Uitkomst UIS Analytical Services

SPTE Lab - Middelburg Umzamo Analytical Services - Witbank

Tata Steel – Wales Lab, Europe Umzamo Analytical Services - Sudor

Umzamo Analytical Services - Overlooked Colliery Zululand Anthracite Colliery

Umzamo Analytical Services - Doornrug

Vitrovian Analytical Services DELMAS

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1. TYPE OF SAMPLE USED

The coal used in this proficiency testing round was bituminous coal

2. PREPARATION OF SAMPLE

Approximately 1000kg’s of sample with an approximate topsize of 50mm was sourced. This was crushed to -

4mm using a jaw crusher. The -4mm material was reduced to -212um using a cross beat pulveriser. The 212

material was sieved using a 212um screen. Any +212um material was pulverised and sieved until all material

passed through the 212 um sieve.

All the -212um material was then mixed in a mixing drum for 4 hours.

3. HOMOGENEITY CHECK

There were 110 participants in this round, 10 portions of sample were randomly extracted. These were

packaged in their final form i.e. in 200ml sample bottles. The bottles were labelled 1 to 10. The results were as

follows:

SAMPLE NO.

TEST PORTION 1

TEST PORTION 2

sample av (Xt) range (Wt) range sqd

1 26,90 26,91 26,91 0,01 0,0001

2 26,88 26,79 26,84 0,09 0,0081

3 26,82 26,74 26,78 0,08 0,0064

4 26,74 27,03 26,89 0,29 0,0841

5 26,78 26,88 26,83 0,10 0,0100

6 26,76 26,98 26,87 0,22 0,0484

7 26,83 26,84 26,84 0,01 0,0001

8 26,84 26,76 26,80 0,08 0,0064

9 26,90 26,81 26,86 0,09 0,0081

10 26,95 26,92 26,94 0,03 0,0009

GENERAL AVERAGE 26,85 STANDARD DEVIATION 0,047 WITHIN SAMPLE STANDARD DEVIATION 0,093

BETWEEN SAMPLE STANDARD DEVIATION 0,046

The between sample standard deviation must be ≤ 0.3 x ơ

(ơ = std deviation for the proficiency assessment)

Ơ = 2% of the mean was used, which is the repeatability for ISO ash (Ash % > 10%)

Hence 0.3 x 0.537 = 0.161

Since 0.046 < 0.161, the samples are homogenous

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4. STABILITY CHECK Samples were retained for sales as reference material. Ten of them were randomly chosen for stability testing.

In order for the proficiency testing samples to be declared stable the general average from the homogeneity

check and that of the stability check the difference in the general average should not differ by more than 0.3 X

precision.

This test has been carried out about a month after the samples were received by the participating laboratories

SAMPLE NO.

TEST PORTION 1

TEST PORTION 2

sample av (Xt) range (Wt) range sqd

1 26,74 26,90 26,82 0,16 0,0256

2 26,99 26,84 26,92 0,15 0,0225

3 26,63 26,96 26,80 0,33 0,1089

4 26,82 26,76 26,79 0,06 0,0036

5 26,88 26,84 26,86 0,04 0,0016

6 26,98 26,89 26,94 0,09 0,0081

7 26,98 26,77 26,88 0,21 0,0441

8 26,92 26,45 26,69 0,47 0,2209

9 26,84 26,93 26,89 0,09 0,0081

10 26,94 26,88 26,91 0,06 0,0036

GENERAL AVERAGE 26,85 STANDARD DEVIATION 0,076 WITHIN SAMPLE STANDARD DEVIATION 0,149

BETWEEN SAMPLE STANDARD DEVIATION 0,074

(Ơ = 0.566 was used)

For this report 0.3 x 0.537 = 0.161

Absolute value of (26.85– 26.85) = 0.0

Since 0.0 < 0.161 the proficiency testing samples were stable

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COAL CONCEPTS - PROFICIENCY TESTING -APRIL 2020

ANALYTICAL PARAMETER : ISO ASH (%)

LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (%) DRY BASE (%) Z-SCORE (DRY BASE)

1a 3,95 27,01 28,12 0,93

6a 3,24 27,04 27,95 -0,15

7a 3,41 27,25 28,21 1,50

9a 3,99 26,75 27,86 -0,66

10a 3,70 26,90 27,93 -0,22

12a 4,20 26,90 28,08 0,68

13a 3,80 26,70 27,75 -1,32

18a 3,63 27,06 28,08 0,68

21a 4,45 26,80 28,05 0,48

23a 3,38 26,93 27,87 -0,60

28a 4,09 26,90 28,05 0,48

30a 4,11 26,69 27,83 -0,84

33a 4,00 26,80 27,92 -0,33

35a 3,76 26,90 27,95 -0,11

36a 3,80 26,90 27,96 -0,04

37a 4,28 26,83 28,03 0,37

38a 4,29 26,42 27,60 -2,25

42a 4,09 27,12 28,28 1,89

49a 3,70 27,16 28,20 1,44

58a 3,51 27,01 27,99 0,14

59a 3,28 27,04 27,96 -0,08

60a 4,16 26,76 27,92 -0,30

66a 3,37 20,04 20,74 -44,57

71a 4,10 26,90 28,05 0,50

74a 3,63 27,00 28,02 0,29

76a 4,00 26,93 28,05 0,51

78a 1,71 26,15 26,60 -8,41

79a 3,91 26,96 28,06 0,54

80a 3,80 26,70 27,75 -1,32

82a 3,80 26,95 28,01 0,3

83a 3,80 27,00 28,07 0,60

91a 4,00 26,50 27,60 -2,25

92a 3,60 26,53 27,52 -2,77

95a 3,39 27,10 28,05 0,50

96a 3,98 27,09 28,21 1,5

97a 4,09 26,84 27,98 0,09

99a 3,70 27,00 28,04 0,42

100a 4,17 26,59 27,75 -1,37

101a 4,12 26,87 28,02 0,3

106a 3,95 26,83 27,93 -0,22

110a 4,02 27,00 28,13 0,99

112a 3,70 26,90 27,93 -0,22

117a 3,65 27,10 28,13 0,97

124a 3,78 26,78 27,83 -0,85

135a 3,65 27,12 28,15 1,10

145a 4,23 26,90 28,09 0,73

151a 3,77 27,08 28,14 1,06

161a 4,10 26,80 27,95 -0,15

162a 4,40 26,75 27,98 0,07

167a 3,60 27,00 28,01 0,24

169a 3,92 27,01 28,11 0,88

170a 4,10 26,80 27,95 -0,15

171a 1,80 26,04 26,52 -8,95

173a 3,96 27,60 28,74 4,74

177a 3,01 26,80 27,63 -2,08

179a 4,00 27,00 28,13 0,96

180a 3,60 26,87 27,87 -0,59

184a 3,40 27,15 28,11 0,84

190a 4,30 26,60 27,80 -1,07

191a 4,50 26,70 27,96 -0,07

192a 4,20 26,50 27,66 -1,90

195a 4,04 26,74 27,87 -0,64

198a 3,50 27,17 28,16 1,15

201a 4,10 26,73 27,87 -0,60

Number of results - 64 64 64 -

OUTLIERS - - 4 4 -

AVERAGE - 3,78 26,89 27,97 -

STD DEVIATION - - 0,18 0,16 -

MEDIAN 26,90 27,99

ROBUST AVERAGE - - 26,89 27,97 -

ROBUST STD DEVIATION - - 0,20 0,17 -

UoM 0,03 0,03

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-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

Z-SC

OR

E

LABORATORY ID

ISO ASH Z-SCORE TREND

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ANALYTICAL PARAMETER : QUICK ASH (%)

LAB ID

MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (%) DRY BASE (%)

Z-SCORE (DRY BASE)

21a 4,45 26,98 28,24 1,37

22a 3,50 25,98 26,92 -3,75

23a 3,38 27,01 27,95 0,27

35a 3,76 26,90 27,95 0,25

36a 3,80 26,90 27,96 0,30

37a 4,28 26,80 28,00 0,44

39a 4,10 26,33 27,46 -1,68 41a 4,00 26,60 27,71 -0,69 49a 3,70 27,01 28,05 0,63 50a 3,59 27,21 28,22 1,31 59a 3,28 26,90 27,81 -0,29 74a 3,63 26,93 27,94 0,23 77a 4,20 26,70 27,87 -0,06 92a 3,60 26,45 27,44 -1,75 94a 3,97 26,68 27,78 -0,40 101a 4,12 26,95 28,11 0,87 102a 4,00 26,60 27,71 -0,69 130a 3,60 26,90 27,90 0,07 133a 4,33 26,33 27,52 -1,42 140a 4,38 26,90 28,13 0,96 145a 4,23 26,50 27,67 -0,84 153a 3,88 26,70 27,78 -0,42 160a 3,88 26,70 27,78 -0,42 161a 4,10 26,60 27,74 -0,58 162a 4,40 26,75 27,98 0,37 163a 4,50 27,20 28,48 2,32 169a 3,92 26,95 28,05 0,64 176a 4,40 27,20 28,45 2,21 178a 3,05 26,93 27,78 -0,42 179a 4,00 26,80 27,92 0,12 181a 4,10 26,50 27,63 -0,98 182a 3,90 26,90 27,99 0,41 184a 3,40 26,90 27,85 -0,15 185a 4,40 26,73 27,96 0,29 187a 3,68 26,78 27,80 -0,32 188a 4,03 26,93 28,06 0,68 189a 4,69 26,83 28,15 1,03 190a 4,30 26,30 27,48 -1,57 191a 4,50 26,50 27,75 -0,53 192a 4,20 26,10 27,24 -2,50 198a 3,50 26,98 27,96 0,28 199a 3,76 27,00 28,05 0,66 Number of results - 42 42 42 - OUTLIERS - - 0 1 -

AVERAGE - 3,97 26,76 27,89 -


MEDIAN 26,82 27,92



UoM 0,06 0,05

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-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

Z-SC

OR

E

LABORATORY ID

QUICK ASH Z-SCORE TREND

of 22 COAL CONCEPTS - PROFICIENCY TESTING -APRIL 2020

ANALYTICAL PARAMETER : ISO VOLATILE MATTER (%)

LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE

Z-SCORE (DRY BASE)

1a 3,95 19,51 20,31 0,04

6a 3,24 19,38 20,03 -0,76

7a 3,41 17,31 17,92 -6,73

9a 3,99 19,75 20,57 0,77

10a 3,70 19,70 20,46 0,45

12a 4,20 18,90 19,73 -1,61

13a 3,80 19,20 19,96 -0,96

18a 3,63 19,17 19,89 -1,15

21a 4,45 19,45 20,36 0,16

22a 3,50 19,67 20,38 0,24

23a 3,38 19,54 20,22 -0,21

28a 4,09 19,80 20,64 0,98

30a 4,11 19,20 20,02 -0,78

33a 4,00 19,05 19,84 -1,29

35a 3,76 19,80 20,57 0,78

36a 3,80 19,20 19,96 -0,96

37a 4,28 19,60 20,48 0,50

38a 4,29 20,09 20,99 1,95

39a 4,10 19,40 20,23 -0,20

41a 4,00 19,90 20,73 1,22

42a 4,09 19,71 20,55 0,71

49a 3,70 19,47 20,22 -0,23

50a 3,59 19,74 20,48 0,50

58a 3,51 19,85 20,57 0,77

59a 3,28 19,74 20,41 0,31

60a 4,16 18,97 19,79 -1,43

66a 3,37 27,07 28,01 21,80

71a 4,10 19,90 20,75 1,28

74a 3,63 19,48 20,21 -0,24

76a 4,00 18,70 19,48 -2,32

77a 4,20 19,50 20,35 0,16

78a 1,71 22,57 22,96 7,53

79a 3,91 19,63 20,43 0,37

80a 3,80 19,30 20,06 -0,67

82a 3,80 19,41 20,18 -0,35

83a 3,80 20,30 21,10 2,27

91a 4,00 20,20 21,04 2,10

92a 3,60 19,44 20,17 -0,38

94a 3,97 21,47 22,35 5,81

95a 3,39 19,38 20,06 -0,67

96a 3,98 19,39 20,19 -0,30

97a 4,09 19,66 20,50 0,56

99a 3,70 19,50 20,25 -0,14

100a 4,17 19,95 20,82 1,47

101a 4,12 19,70 20,55 0,70

102a 4,00 20,10 20,94 1,80

106a 3,95 19,67 20,48 0,51

110a 4,02 19,46 20,28 -0,07

112a 3,70 19,60 20,35 0,15

117a 3,65 19,33 20,06 -0,67

124a 3,78 18,94 19,68 -1,74

130a 3,60 19,50 20,23 -0,2

133a 4,33 19,18 20,04 -0,72

135a 3,65 19,12 19,84 -1,28

140a 4,38 19,53 20,42 0,36

145a 4,23 19,60 20,47 0,47

151a 3,77 19,60 20,37 0,20

161a 4,10 19,90 20,75 1,28

162a 4,40 19,64 20,54 0,69

167a 3,60 19,60 20,33 0,09

169a 3,92 18,70 19,46 -2,36

170a 4,10 19,50 20,33 0,10

173a 3,96 20,19 21,02 2,05

179a 4,00 19,00 19,79 -1,43

180a 3,60 19,90 20,64 0,97

181a 4,10 19,50 20,33 0,10

182a 3,90 19,80 20,60 0,86

184a 3,40 19,60 20,29 -0,03

187a 3,68 19,48 20,22 -0,23

188a 4,03 19,13 19,93 -1,03

189a 4,69 18,93 19,86 -1,24

190a 4,30 19,10 19,96 -0,96

191a 4,50 19,00 19,90 -1,14

192a 4,20 19,10 19,94 -1,02

195a 4,04 19,60 20,43 0,36

198a 3,50 19,60 20,31 0,03

199a 3,76 19,76 20,53 0,66

201a 4,10 19,40 20,23 -0,20

NUMBER OF RESULTS - 78 78 78 -

OUTLIERS - - 4 4 -

AVERAGE - 3,88 19,50 20,30 -

STD DEVIATION - 0,34 0,35 -

MEDIAN 19,51 20,32



UoM - - 0,05 0,06

of 22

-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

7a 169a

76a

124a

12a

179a

60a

33a

135a

189a

18a

191a

188a

192a

190a

13a

36a

30a

6a 133a

95a

117a

80a

92a

82a

96a

74a

49a

187a

23a

130a

39a

201a

99a

110a

184a

198a

1a 167a

170a

181a

112a

77a

21a

151a

22a

59a

140a

195a

79a

10a

145a

50a

37a

106a

97a

199a

162a

101a

42a

9a 58a

35a

182a

180a

28a

41a

71a

161a

100a

102a

38a

173a

91a

83a

94a

78a

66aZ-

SCO

RE

LABORATORY ID

VOLATILE MATTER Z-SCORE TREND

of 22 COAL CONCEPTS - PROFICIENCY TESTING -APRIL 2020

ANALYTICAL PARAMETER : CALORIFIC VALUE (MJ/kg)

LAB ID

MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (MJ/kg) DRY BASE (MJ/kg)

Z-SCORE (DRY BASE)

1a 3,95 21,57 22,46 -0,85

6a 3,24 21,76 22,49 -0,75

9a 3,99 21,58 22,48 -0,79

10a 3,70 21,78 22,62 -0,32

12a 4,20 21,71 22,66 -0,17

18a 3,63 21,74 22,56 -0,51

21a 4,45 21,60 22,61 -0,36

23a 3,38 21,85 22,61 -0,33

28a 4,09 22,46 23,42 2,33

30a 4,11 21,83 22,77 0,17

33a 4,00 21,88 22,79 0,26

35a 3,76 21,78 22,63 -0,27

36a 3,80 21,92 22,79 0,24

37a 4,28 21,57 22,53 -0,59

38a 4,29 22,62 23,63 3,05

39a 4,10 21,55 22,47 -0,80

42a 4,09 22,48 23,44 2,40

49a 3,70 21,79 22,63 -0,29

50a 3,59 21,74 22,55 -0,54

58a 3,51 21,73 22,52 -0,64

60a 4,16 21,69 22,63 -0,27

66a 3,37 21,90 22,66 -0,17

71a 4,10 21,63 22,55 -0,53

74a 3,63 21,72 22,54 -0,58

76a 4,00 22,06 22,98 0,88

77a 4,20 21,93 22,89 0,59

79a 3,91 21,95 22,84 0,43

80a 3,80 21,68 22,54 -0,59

82a 3,80 21,84 22,70 -0,05

83a 3,80 21,93 22,80 0,27

91a 4,00 21,62 22,52 -0,64

92a 3,60 21,33 22,13 -1,95

94a 3,97 21,47 22,35 -1,19

95a 3,39 22,16 22,94 0,74

96a 3,98 21,94 22,85 0,45

99a 3,70 21,67 22,50 -0,70

100a 4,17 21,65 22,59 -0,40

101a 4,12 21,51 22,43 -0,93

102a 4,00 22,36 23,29 1,91

106a 3,95 21,68 22,57 -0,47

110a 4,02 21,71 22,62 -0,31

112a 3,70 21,65 22,48 -0,77

117a 3,65 21,83 22,66 -0,19

124a 3,78 21,76 22,61 -0,33

130a 3,60 21,66 22,47 -0,81

133a 4,33 21,49 22,46 -0,84

135a 3,65 21,78 22,61 -0,36

140a 4,38 21,62 22,61 -0,34

145a 4,23 21,85 22,82 0,34

151a 3,77 21,66 22,51 -0,68

153a 3,88 21,61 22,48 -0,77

160a 3,88 22,01 22,90 0,61

161a 4,10 21,72 22,65 -0,22

162a 4,40 22,88 23,93 4,04

163a 4,50 21,92 22,95 0,79

167a 3,60 21,98 22,80 0,29

169a 3,92 21,70 22,59 -0,43

170a 4,10 21,64 22,57 -0,49

171a 1,80 22,31 22,72 0,02

172a 4,27 21,20 22,15 -1,88

176a 4,40 21,98 22,99 0,92

177a 3,01 22,28 22,97 0,85

179a 4,00 21,70 22,60 -0,36

180a 3,60 21,29 22,09 -2,08

181a 4,10 22,48 23,44 2,41

182a 3,90 22,40 23,31 1,97

184a 3,40 21,99 22,76 0,17

187a 3,68 22,59 23,45 2,45

188a 4,03 22,39 23,33 2,04

189a 4,69 21,55 22,61 -0,34

190a 4,30 21,72 22,70 -0,06

191a 4,50 21,58 22,60 -0,39

192a 4,20 21,87 22,83 0,38

195a 4,04 21,75 22,67 -0,16

198a 3,50 22,13 22,93 0,72

199a 3,76 21,76 22,61 -0,34

201a 4,10 21,83 22,76 0,16

NUMBER OF RESULTS - 77 77 77 -

OUTLIERS - - 0 1 -

AVERAGE - 3,90 21,84 22,71 -


MEDIAN 21,76 22,62



UoM - - 0,05 0,05 -

of 22

-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

180a

92a

172a

94a

101a

1a 133a

130a

39a

9a 112a

153a

6a 99a

151a

58a

91a

37a

80a

74a

50a

71a

18a

170a

106a

169a

100a

191a

179a

135a

21a

199a

140a

189a

23a

124a

10a

110a

49a

35a

60a

161a

117a

12a

66a

195a

190a

82a

171a

201a

184a

30a

36a

33a

83a

167a

145a

192a

79a

96a

77a

160a

198a

95a

163a

177a

76a

176a

102a

182a

188a

28a

42a

181a

187a

38a

162aZ-SC

OR

E

LABORATORY ID

CALORIFIC VALUE Z-SCORE TREND

of 22


ANALYTICAL PARAMETER : TOTAL SULPHUR (%)

LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE)

1a 3,95 1,25 1,30 0,20

6a 3,24 1,32 1,36 1,05

7a 3,41 0,33 0,34 -12,93

9a 3,99 1,20 1,25 -0,51

10a 3,70 1,16 1,20 -1,13

12a 4,20 1,24 1,29 0,0

13a 3,80 1,05 1,09 -2,68

18a 3,63 1,23 1,28 -0,15

21a 4,45 1,24 1,30 0,15

23a 3,38 1,21 1,25 -0,48

28a 4,09 1,22 1,27 -0,21

30a 4,11 1,23 1,28 -0,06

36a 3,80 1,19 1,24 -0,69

37a 4,28 1,27 1,33 0,54

38a 4,29 1,41 1,47 2,55

39a 4,10 1,20 1,25 -0,49

42a 4,09 1,37 1,43 1,93

49a 3,70 1,28 1,33 0,58

50a 3,59 1,32 1,37 1,12

60a 4,16 1,27 1,33 0,52

66a 3,37 1,32 1,37 1,08

71a 4,10 1,15 1,20 -1,20

74a 3,63 1,19 1,23 -0,72

76a 4,00 1,29 1,34 0,77

78a 1,71 0,96 0,98 -4,25

79a 3,91 1,25 1,30 0,19

80a 3,80 1,21 1,26 -0,40

83a 3,80 1,24 1,29 0,0

91a 4,00 1,31 1,36 1,06

95a 3,39 1,30 1,35 0,80

97a 4,09 1,20 1,25 -0,49

99a 3,70 1,24 1,29 0,0

101a 4,12 1,28 1,34 0,65

106a 3,95 1,29 1,34 0,76

110a 4,02 1,24 1,29 0,07

112a 3,70 1,18 1,23 -0,85

130a 3,60 1,20 1,24 -0,58

133a 4,33 1,22 1,28 -0,16

135a 3,65 1,28 1,33 0,57

140a 4,38 1,24 1,30 0,13

145a 4,23 1,19 1,24 -0,61

151a 3,77 1,25 1,30 0,16

161a 4,10 1,16 1,21 -1,06

162a 4,40 1,22 1,28 -0,15

167a 3,60 1,44 1,49 2,83

169a 3,92 1,24 1,29 0,0

172a 4,27 1,23 1,28 -0,03

173a 3,96 1,21 1,26 -0,37

177a 3,01 1,19 1,23 -0,82

179a 4,00 1,13 1,18 -1,51

180a 3,60 1,09 1,13 -2,14

181a 4,10 1,26 1,31 0,37

184a 3,40 1,17 1,21 -1,04

188a 4,03 1,14 1,19 -1,36

189a 4,69 1,35 1,42 1,77

190a 4,30 1,19 1,24 -0,60

191a 4,50 1,19 1,25 -0,56

192a 4,20 1,19 1,24 -0,62

198a 3,50 1,34 1,39 1,39

199a 3,76 1,25 1,30 0,16

201a 4,10 1,24 1,29 0,00

NUMBER OF RESULTS 61 61 61 -

OUTLIERS - - 2 2 -

AVERAGE - 3,88 1,24 1,29

MEDIAN - 1,24 1,29

STD DEVIATION - - 0,07 0,07



UoM - - 0,01 0,01

of 22

-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

7a 78a

13a

180a

179a

188a

71a

10a

161a

184a

112a

177a

74a

36a

192a

145a

190a

130a

191a

9a 97a

39a

23a

80a

173a

28a

133a

162a

18a

30a

172a

12a

201a

99a

83a

169a

110a

140a

21a

199a

151a

79a

1a 181a

60a

37a

135a

49a

101a

106a

76a

95a

6a 91a

66a

50a

198a

189a

42a

38a

167aZ-

SCO

RE

LABORATORY ID

TOTAL SULPHUR Z-SCORE TREND

of 22


ANALYTICAL PARAMETER : PHOSPHOROUS IN COAL (%)

LAB ID

MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE

Z-SCORE (DRY BASE)

1a 3,95 0,048 0,050 0,25

7a 3,41 0,070 0,072 6,55

12a 4,20 0,047 0,049 0,0

13a 3,80 0,043 0,045 -1,23

18a 3,63 0,021 0,022 -7,65

21a 4,45 0,041 0,043 -1,73

23a 3,38 0,044 0,045 -1,02

38a 4,29 0,083 0,086 10,40

74a 3,63 0,045 0,047 -0,67

78a 1,71 0,049 0,050 0,22

99a 3,70 0,050 0,052 0,80

112a 3,70 0,052 0,054 1,38

114a 3,88 0,053 0,055 1,70

169a 3,92 0,049 0,051 0,54

172a 4,27 0,049 0,051 0,59

173a 3,96 0,044 0,046 -0,92

177a 3,01 0,048 0,049 0,00


OUTLIERS - - 3 3 - AVERAGE - 3,70 0,047 0,049 -

STD DEVIATION - - 0,003 0,004 -

MEDIAN - 0,048 0,050

ROBUST AVERAGE - - 0,047 0,049 ROBUST STD DEVIATION - - 0,004 0,004

UoM - - 0,001 0,001

-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

18a 21a 13a 23a 173a 74a 12a 177a 78a 1a 169a 172a 99a 112a 114a 7a 38a

Z-SC

OR

ES

LAB ID

PHOSPHOROUS IN COAL Z-SCORES

of 22


ANALYTICAL PARAMETER : TOTAL CARBON (%)

LAB ID


Z-SCORE (DRY BASE)

1a 3,95 56,18 58,49 0,00

9a** 3,99 57,18 59,56 1,17

12a 4,20 55,70 58,14 -0,38

18a 3,63 56,02 58,13 -0,40

21a** 4,45 56,86 59,51 1,12

66a** 3,37 57,80 59,82 1,45

99a 3,70 55,50 57,63 -0,94

145a 4,23 55,27 57,71 -0,85

173a 3,96 61,23 63,75 5,77

177a** 3,01 55,70 57,43 -1,16


OUTLIERS - - 1 1 -

AVERAGE - 3,85 56,25 58,49 -

MEDIAN - - 56,02 58,14 -


REPRODUCIBILITY

UPPER LIMIT - - - 59,49 -

LOWER LIMIT - - - 57,49 -


ANALYTICAL PARAMETER : HYDROGEN (%)

LAB ID


Z-SCORE (DRY BASE)

1a 3,95 2,98 3,10 0,38

9a 3,99 2,00 2,08 -2,01

12a 4,20 3,03 3,16 0,52

18a 3,63 2,74 2,84 -0,23

21a 4,45 2,84 2,97 0,07

36a** 3,80 2,56 2,66 -0,66

99a** 3,70 3,10 3,22 0,65

177a** 3,01 3,38 3,48 1,27

Number of results 8 8 8

OUTLIERS - - 0 0 -

AVERAGE - 3,84 2,83 2,94 -

MEDIAN - 2,91 3,04 -


REPRODUCIBILITY

UPPER LIMIT - - 3,19 -

LOWER LIMIT - - - 2,69 -


ANALYTICAL PARAMETER : NITROGEN(%)

LAB ID


Z-SCORE (DRY BASE)

1a 3,95 1,36 1,42 0,64

9a** 3,99 11,24 11,71 81,97

12a** 4,20 1,54 1,61 2,15

18a** 3,63 1,11 1,15 -1,45

99a 3,70 1,37 1,42 0,69

177a 3,01 1,31 1,35 0,12

Number of results 6 6 6 -

OUTLIERS - - 1 1 -

AVERAGE - 3,75 1,34 1,34 -

MEDIAN - 1,36 1,38 -

STD DEVIATION - - 0,15 0,13 - REPRODUCIBILITY UPPER LIMIT - - - 1,49 - LOWER LIMIT - - - 1,19 -

of 22


ANALYTICAL PARAMETER : ASH FUSION TEMPERATURES (oC)

LAB ID DEFORMATION SOFTENING HEMISPHERE FLOW

1a 1442 1475 1497 1500

9a 1500 1500 1500 1500

10a 1480 1500 1500 1500

18a 1440 1460 1490 1500

21a 1500 1500 1500 1500

23a 1388 1456 1484 1500

28a 1450 1468 1500 1500

38a 1500 1500 1500 1500

49a 1390 1450 1500 1500

60a 1397 1453 1500 1500

80a 1430 1450 1480 1500

95a 1450 1470 1500 1500

99a 1500 1500 1500 1500

151a** 1360 1390 1440 1500

Number of results 14 14 14 14

Outliers 0 1 1 0

AVERAGE 1445 1476 1496 1500

MEDIAN 1446 1470 1500 1500

STDEV 48 21 7 0

REPRODUCIBILITY

UPPER LIMIT 1500 1500 1500 1500

LOWER LIMIT 1365 1416 1436 1420

Z-SCORES

LAB ID DEFORMATION SOFTENING HEMISPHERE FLOW

1a -0,06 -0,03 0,11 0

9a 1,16 1,14 0,54 0

10a 0,74 1,14 0,54 0

18a -0,10 -0,72 -0,90 0

21a 1,16 1,14 0,54 0

23a -1,19 -0,91 -1,76 0

28a 0,11 -0,35 0,54 0

38a 1,16 1,14 0,54 0

49a -1,15 -1,19 0,54 0

60a -1,00 -1,05 0,54 0

80a -0,31 -1,19 -2,33 0

95a 0,11 -0,26 0,54 0

99a 1,16 1,14 0,54 0

151a -1,78 -3,99 -8,09 0


ANALYTICAL PARAMETER : CHLORINE (ppm)


12a 4,20 56 58 -

177a 3,01 53 55 -


OUTLIERS - - - - -

AVERAGE - 3,61 55 57 -

STD DEVIATION - - 2 3 -

MEDIAN - - 55 57 -


ANALYTICAL PARAMETER : FLUORINE (ppm)


12a 4,20 130 136 -

177a 3,01 224 231 -


OUTLIERS - - - - -

AVERAGE - 3,61 177 183 -

STD DEVIATION - - 66 67 -

MEDIAN - - 177 183 -


ANALYTICAL PARAMETER : ASTM ASH (%)


1a 3,95 27,07 28,18 -

172a 4,27 27,06 28,27 -


OUTLIERS - - - - -

AVERAGE - 4,11 27,07 28,23 -


MEDIAN - - 27,07 28,23 -


ANALYTICAL PARAMETER : ASTM VOLS (%)


1a 3,95 20,22 21,05 -

172a 4,27 19,27 20,13 -


OUTLIERS - - - - -

AVERAGE - 4,11 19,75 20,59 -


MEDIAN - - 19,75 20,59 -

of 22

CONCLUSION

1. The overall ISO Ash determination trend is evenly distributed. The average, robust average and median are similar. Four outliers were detected.

2. The overall ISO volatile determination trend is evenly distributed. Four outliers were detected. The outliers

seemed to be due to a combination of analytical and calculation errors.

3. Calorific value graph is negatively biased. One outlier was detected.

4. The z-score trend for sulphur had almost equal negative and positive results. The median, robust average

and mean are the same at 1.29% dry base. Two outliers were detected by Grubbs estimate.

5. Three outliers were detected on phosphorous analysis. The median, robust average and mean compared

well with each other indicating that the extreme values did not affect the centralized values.

6. Carbon, Hydrogen and Nitrogen analysis was generally well done, with one outlier on Carbon and Nitrogen

7. AFT: One outlier was detected on the Softening and Hemisphere stages.

8. Assessment criterion for homogeneity check

8.1 Comparison of the between sample standard deviation with the standard deviation for proficiency

testing Standard deviation for ISO ash =0.18 Check value = 0.18 x 0.3 = 0.054

Between sample standard deviation = 0.046 The between standard deviation is less than the check value for the criterion assessment for

homogeneity, therefore the proficiency test samples were homogeneous.

of 22

COAL CONCEPTS: Terms and Conditions

Return of results: Laboratories participate in proficiency testing programs on the understanding that they will be sharing their results and information anonymously with other laboratories performing the same analysis. No return of results compromises the spirit of the programs, and reports will not be sent to laboratories unless they return results. Payment in full is required from all laboratories enrolling whether they return results or not. Errors in Participant Proficiency Testing Results: Proficiency testing reports should reflect the level of accuracy that a regular testing client would receive. If a participant finds an error in their proficiency testing results, they may notify us in writing and change their submission PRIOR to the due date for return. Changes after this time will not be accepted. Coal Concepts’ reports results as submitted by participants. On occasion, it seems as though participants have mixed up the samples or not processed the samples according to the instructions. Coal Concepts cannot make assumptions of this nature and change results 'to suit'. We also cannot compromise the integrity of the programs by suggesting to some participants that they should review their results prior to the due date. (This is unfair to other participants) It is the responsibility of the participants to check all aspects of the program, including sample identification, preparation, testing instructions, calculations and reporting of the results prior to results submission. If samples are not in good condition on arrival to the participant laboratory, Coal Concepts must be notified in writing IMMEDIATELY, as often samples can be replaced in good time. Claims about samples received in bad condition will not be accepted after the report has been issued. Late Enrolments and Late Results: Late enrolment requests cannot always be accommodated, as sample manufacture must be scheduled well in advance to the shipping date of the program to allow all necessary quality assurance activities to be carried out. Shipping of PT materials and evaluating test results from PTPs out of cycle with the mainstream programs is considerably time consuming and therefore costly. In order not to disadvantage participants able to comply with time frames, Coal Concepts may charge a late fee in the following circumstances: Requests that Coal concepts staff enters results on behalf of participants Requests to record results after the due date Requests for PTP participation that is out of cycle with the scheduled dates Shipping fees and Customs clearance: Costs incurred for shipping samples and clearance of same through customs are the responsibility of the participating laboratory unless otherwise indicated Non-payment of fees: Coal Concepts retains the right to withhold reports and/or test materials and services when invoices are outstanding. Confidentiality of results: All data and information received by Coal Concepts from its clients are considered confidential unless the client has given express permission to pass on information. Definitions: The dictionary definitions of “collusion” and “falsification” are as follows. · Collusion: A secret agreement or cooperation for a fraudulent or deceitful purpose. · Falsification: Deliberately changing something to be false. In proficiency testing terms, collusion is comparing data (and perhaps changing data) to fit in with a believed “correct” result. This is contrary to the spirit of proficiency testing programs, which are issued with the intention of providing an objective comparison of a laboratory’s performance with others. Coal Concepts tries to minimise the occurrence of collusion by being aware that laboratories should be objective when they report their results, and should therefore not know the intended results at the time they are reporting to us. Answers are not provided to clients until results have been submitted. To prevent collusion and falsification our advice to clients is: DON’T confer with others about PT samples or results. DO accept the fact that everyone makes errors. DON’T average the results or opinions of every person in the laboratory before selecting the answer to be submitted. Instead, use one of the answers AS SUBMITTED to you and take advantage of the Coal Concepts internal QA services and submit all answers generated by the technicians. DO have confidence in your own results. Proficiency Testing (PT) is a compulsory part of laboratory accreditation, but it is also an important tool for giving you confidence in your results. “Enhancing” your PT results with assistance from another participant cannot increase confidence in your laboratory’s performance. Coal concepts’ testing staff are not told what the expected results are, nor what we are expecting. We subject ALL results to analysis, even if they are different. The staff have the right to check that the results we enter on their behalf are correctly transcribed. Clients are always welcome to contact Coal Concepts to seek advice or information about collusion or falsification of data. Policy for Participant Appeal of PT Performance Assessment: If participants disagree with their performance assessment in a proficiency report, they should inform Coal Concepts in writing. The response will include Coal Concepts interpretation of the outcome of the reassessment and an explanation of that outcome. (For example, explanation of a calculation, or the rationale for the outcome of the evaluation.) If a mistake has been made by Coal Concepts, it will be dealt with via Coal Concepts’ non-conformance system. Liability In no event shall a party's liability to the other party for direct damages exceed an amount equal to the value of the amount for the PT Programme, under that specific month End of report

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