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IS 5057 (1997): Potassium Nitrite, Food Grade [FAD 8: FoodAdditives]

IS 5057 : 1997

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Indian Standard

POTASSIUM NITRITE, FOOD GRADE - SPECIFICATION

( First Revision )

ICS 67.220.20; 71.060.50

0 BIS 1997

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

September 1997 Price Group 1

Food Additives Sectional Committee, FAD 8

FOREWORD

This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards after the draft finalized by the Food Additives Sectional Committee had been approved by the Food and Agriculture Division Council.

With the increased production of processed foods, manufacturers have started adding a large number of substances, generally in small quantities, to improve the appearance, flavour, texture or storage properties and in some cases to enhance the nutritive values of the processed foods. As certain impurities in these substances have been found to be harmful, it is necessary to have strict quality control of these food additives. A series of standards was, therefore, prepared by this Bureau to coverpurity and identification of these substances. These standards would help in checking purity which requires to be checked at the stage of manufacture, for it is extremely difficult (and in many cases impossible) to detect the impurity once these substances have been added to the processed foods. Besides, these standards are intended to guide the indigenous manufacturers in making their product conform to specifications that are accepted by scientists, health authorities and international bodies, and its consumer industries to use it within the levels permitted by the health authorities.

Potassium nitrite is permitted as a food preservative under the Pmwention ofFood Adulteration Rules, 1955.

Chemical Name and Formula - The recognized chemical name is potassium nitrite. Chemical formula is &X02. Its molecular weight is 85.11.

The standard was first published in 1969. It is being revised to incorportate the following chan- ges/modifications:

a) to provide a separate clause for description including the solubility property to keep it~in line with food chemical codex NRC.

b) to provide additional requirement for heavy metals.

c) to provide instruction for storage and expiry/best before date under marking clause.

In the preparation of this standard, considerable amount of assistance has been derived from the following publications:

Food chemical Codex (FCC), Third Edition, 1981, National Academy of Science, National Research Council, Washington D.C., USA

Compendium of Food Additive Specifications, Volume 2, Joint FAO/WHO Expert committee on food Additives JECFA, 1992.

This standard is harmonized with the specification of FCC. However, the standard deviates from the FAO/WHO specification, in that the requirement ofpH is not specified in this standard.

For the purpose of deciding whether a particular requirement of this standard is complied with the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values (revised)‘. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

IS 5057 : 1997

Indian Standard

POTASSIUM NITRITE, FOOD GRADE - SPECIFICATION

( First Revision )

1 SCOPE 4.1.1.1 Testforyotmsiunl

1.1 This standard prescribes the requirements and the methods of sampling and test for potassium nitrite, food grade.

2 REFERENCES

When to then neutral 10 percent solution of the material sodium bitartarate is added, a white precipitate shall beformed. This precipitate shall be soluble in ammonia and in solution of alkali hydroxides or carbonates.

The following Indian Standards contain provisions which through reference in this text, constitute provision of this standard. At the time of publica- tion, the editions indicated were valid. All sland- ards are subject to revision and partics to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:

IS No. Title

1070 : 1992 Reagent grade water (third revision)

4.1 .L.2 Test for nitrite

To a 10 percent solution of the material add a few drops of potassium iodide and a few drops of dilute sulphuricacid; iodine shall be libcratcd which shall turn starch solution to blue.

4.2 The material shall also conform to the require- men ts given in Table 1.

Table 1 Requirements for Potassium Nitrite _ (Clause 4.2)

Sl Chnracteristic Kequircmcnt hlell~od crfl‘esl No.

1699 : 1995 Methods of sampling and test for synthetic food colours (secorzd -revision) (2)

4447 : 1994 Sodium benzoate, food grade (first revision)

(1) 9

ii)

3 DESCRIPTION

3.1 Potassium nitrite shall be in the form of small white or yellowish deliquesccnt granules or cylindrical sticks. It is very soluble in water but is sparingly soluble in alcohol.

NOTE - The soluhility is intended only as infomlation regarding approximate solubility and is not to be considered as a quality requirement and is of minor significance as a means of identification or determination of purity, and dependence must be placed on other specifications.

iii)

iv)

v)

Purity (as KN0.2) ou dry basis, percent by mass, Mitl

Loss on drying when dried over silica gel lor four hours, percent by mass, Afar

Arsenic (as As), nigkg, Afar

Lead (as I%), mgkg, Mur

I Ieavy metals (as Pb), mgkg, MUK

5 PACKING, STORAGE AND MARKING

5.1 Packing

4 REQUIRGMENTS

4.1 Identification Test

The material shall be securely packed in well-filled containers with minimum accc.s3 lo light and moisture. The containers shall be such as to preclude contamination of the contentswith metals or other impurities.

4.1.1 A 10 percent solution of potassium nitrite shall be alkaline to litmus and shall give positive test for potassium given in 4.1.1.1 and positive test for nitrite given in 4.1.1.2.

5.2 Storage

The material shall be stored in a cool and dry place so as to avoid excessive exposure to heat.

r \ IW to Cl No. of Annex IS 1699

(3) (3) (5)

97 A -

1 - -

3 - 15

10 - 15

20 B -

1

IS 5057:1997

5.3 Marking

53.1 Each container shall be legibly and indelibly marked with the following information:

a) Name of the material including the words ‘Food Grade’;

b)

C> d) e) 9 g> h)

Type of the material whether ‘anhydrous’ or ‘dihydrate’; Name and address of the manufacture; Net content when packed; Batch or code number; Directions for storage; Expiry/Best before date; and Any other requirements as specified under the Standards of Weights and Measures (Pack- aged Commodities) Rules, 1977JPrevention of Food Adulteration Rules, 1955.

5.3.2 BIS Certification Marking

The product may also be marked with the Standard Mark.

5.3.2.1 The use of the Standard Mark is governed by the provisions of Bureau of Indian Standards Act, 1986 and the Rules and Regulations made there- under. The details of conditions under which the licence for the use of Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standrds.

6 SAMPLING

6.1 The representative samples of the material shall be drawn according to the methods prescribed in 4 of IS 1699.

7 QUALITY OF REAGENTS

Unless specified otherwise, pure chemicals and dis- tilled water (see IS 1070) shall be employed in tests.

NOTE - ‘Pure chemicals shall mean chemicals that do not contain impurities which affect the results of analysis.

ANNEX A

[Tuble 1, SZ No. (i)] DETERMINATION OF PURITY

A-l REAGENTS A-2 PROCEDURE

A-l.1 Pottasium Permanganate Solution

0.1 N.

A-L.2 Sulphuric Acid

94.5 to 95.5 percent.

A-2.1 Transfer about 1.2 g of the material, ac- curately weighed, into a 100 ml volumctricflask, dissolve in water, dilute to volume and mix. Pipette 10 ml of this solution into a mixture of 50 ml of 0.1 N potassium permanganate, 100 ml ofwater and 5 ml of the sulphuric acid, keeping the tip of the pipette well below the surface of the liquid. Warm

A-l.3 Oxalic Acid Solution the solution to 4O”C, allow it to stand for 5 min, and add 25 ml of 0.1 N oxalic acid. Heat the mixture to

0.1 N. about SOY, and titrate with 0.1 N potassium permanganate. Each ml of 0.1 N potassium permanganate is equivalent to 4.255 mg of KNOz

ANNEX B

[Table 1, SZ No. (v)]

TEST FOR EIEAVY METALS

B-l PROCEDURE

Proceed as given in Annex J of IS 4447 except that the first sentence in J-2.2, solution B shall be as

hydrochloric acid and evaporate to dryness on a

follows: steam bath. To the residue add 2 ml of hydrochloric acid, again evaporate to dryness, and dissolve the

‘Dissolve 1 g of the sample in 15 ml of dilute residue in 25 ml ofwater.’

Bureau of Indian Standards

BIS is a statutory institution established under the Bureuu of Indian Standards Act, 198G to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

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Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Handbook’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Dot : No. FAD 8(468).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected -

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