is 2797 (1998): potassium bromide - · pdf file 2018. 11. 14. · potassium bromide...

Click here to load reader

Post on 29-Jan-2021

0 views

Category:

Documents

0 download

Embed Size (px)

TRANSCRIPT

  • Disclosure to Promote the Right To Information

    Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

    इंटरनेट मानक

    “!ान $ एक न' भारत का +नम-ण” Satyanarayan Gangaram Pitroda

    “Invent a New India Using Knowledge”

    “प0रा1 को छोड न' 5 तरफ” Jawaharlal Nehru

    “Step Out From the Old to the New”

    “जान1 का अ+धकार, जी1 का अ+धकार” Mazdoor Kisan Shakti Sangathan

    “The Right to Information, The Right to Live”

    “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है” Bhartṛhari—Nītiśatakam

    “Knowledge is such a treasure which cannot be stolen”

    “Invent a New India Using Knowledge”

    है”ह”ह

    IS 2797 (1998): Potassium bromide [CHD 1: Inorganic Chemicals]

  • IS 2797 : 1998

    POTASSIUM BROMIDE - SPECIFICATION

    ( Third Revision )

    ICS 7 I .060.50

    0 BIS I998

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

    NEW DELHI 110002

    September 1998 Price Group 7

  • Acids, Alkalies and Halides Sectional Committee. CHD 2

    FOREWORD

    This Indian Standard (Third Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Acids. Alkalies and Halides Sectional Committee had been approved by the Chemical Division Council.

    Potassium bromide is used in medicine, preparation of other bromides and special soaps, in photography, and as a reagent in laboratories. In photography, this material is used for processing photographic films and in the preparation of photographic emulsions.

    This standard was originally published in 1964 and subsequently revised in 1982 and 1994 deleting Grade I of the material suitable for photographic industry, as a separate standard, namely, IS 13106 : 1991 ‘Potassium bromide, photographic grade’ covers requirement of the material used in photographic industries. Also the requirements for nitrogen and sulphides have been deleted.

    In this revision, titrimetric method for determination of chlorides, calorimetric method of heavy metals and iron and turbidimetric method for determination of sulphate have been incorporated as an alternate method.

    The composition of the committee responsible for the formulation of this standard is given in Annex C

    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 (rerpised)‘. 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 2797 : 1998

    Indian Standard

    POTASSIUM BROMIDE - SPECIFICATION

    ( Third Revision )

    1 SCOPE galvanized iron drums lined with polyethylene or in

    This standard prescribes requirements and methods of glass bottles.

    sampling and test for potassium bromide. 5.2 Marking

    2 REFERENCES

    The Indian Standards listed below contain provisions which through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties 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.

    264 : 1976

    323 : 1959

    1070 : 1992

    2088 : 1983

    4161 : 1967

    3905 : 1968

    Title

    Nitric acid (second revision)

    Rectified spirit (revised)

    Reagent grade water (third re%on)

    Methods for determination of arsenic (second revision)

    Nessler cylinders

    Methods for random sampling

    The containers shall be marked with the following details:

    a) Name and grade of the material,

    b) Indication of the source of manufacture,

    c) Mass of the material in the container,

    d) Batch number, and

    e) Date of manufacture.

    5.2.1 The containers of Grade I material shall also be labelled with the analytical data for the characteristics given in col 3 of Table 1.

    Table 1 Requirements for Potassium Bromide (Clauses 4.2 and 5.2.1)

    SI No. Characteristic Requirement for Method of Test

    /‘Grade 1 A , (Ref to Cl No.

    Grade 2 of Annex A)

    (1) (2) (3) (4) (3 i) Potassium bromide, 99 0 98.5 A-2

    3 GRADES

    The material shall be of two grades as given below:

    percent by mass of dried material, Min

    ii) pH ofaqueous solution 6.0 to 7.5 6.0 to 7.5 A-3

    C;KI& I - Analytical reagent grade, and iii) Chlorides (as Cl), 0.2 0.4s

    percent by mass, MUX

    Crude 2 - Pure grade suitable for the chemical iv) Bromates (as B&3), 0.001 0.00 I

    industry. percent by mass. MUX v) Iodides To pass test -

    4 REQUIREMENTS

    4.1 Description

    The material shall be in the form of colourless, transparent or opaque crystals, or a white granular powder, free from foreign matter and visible impurities.

    4.2 The material shall also comply with the requirements given in Table 1 when tested according to the methods specified in Annex A. Reference to the relevant clauses of Annex A is given in col 5 of the table.

    vi) Heavy metals (as Pb).

    percent by mass, MU

    vii) Iron (as Fe), percent

    by mass, MUX

    viii) Sulphates (as SO&

    percent by mass, Ma_t

    ix) Moisture. percent by

    mass, MUX

    x) Alkaline earth metals (as Mg). percent by mass, Max

    xi) Sodium (X Nn),

    percent by mass, Max

    xii) Arsenic (as As203).

    ppm, Mm

    xiii) Barium

    xiv) Matter insoluble in

    0.00 I 0.00 I

    0.001 0.008

    0.01 0.06

    0.5 I.0

    0.005 0.01

    0.05

    5 PACKING AND MARKING

    5.1 Packing

    5 10

    To pass test

    0.005 -

    A-4

    A-S

    A-6

    A-7

    A-X

    A-9

    A-10

    A-l 1

    A-12

    A-l?

    A-14

    A-15

    Unless otherwise agreed to between the purchaser and the supplier, the material shall be packed in clean

    1

    water, percent by

    mass. Max

  • IS 2797 : 199x

    5.3 BIS Certification Marking useofstandard Mark may be granted to manufacturers

    The containers may also be marked with the Standard or producers may be obtained from the Bureau of

    Mark Indian Standards,

    5.3.1 The use of the Standard Mark is governed by the 6 SAMPLING

    provisions of Bureau ctf ltdm Standards Act, i 986 6.1 The method of drawing representative samples of and the Rules and Regulations made thereunder. The the material and the criteria l’or conformity sh;111 hc as details of conditions under which the licence for the prescribed in Annex B.

    ANNEX A

    (Clause 4.2, and Table 1)

    METHODS OF TEST FOR POTASSIUM BROMIDE

    A-l QUALITY OF REAGENTS

    A-l.1 Unless specified otherwise, pure chemicals and distilled water (XP IS 1070) shall be used in tests.

    NOTE - ‘Pure chemicals‘ shnll mean chemicals that do not cnntan impurities which affect the results ofnnnlysis.

    A-2 DETERMINATION OF POTASSIUM BROMIDE

    A-2.1 Reagents

    A-2.1.1 Stuntlard Silver Nitrate Solution - 0.1 N.

    A-2.1.2 Concenrrated Nitric Acid - See IS 264.

    A-2.1.3 Nitrohenz,ene

    A-2.1.4 Ferric Alum Indicator Solution

    saturated solution.

    A-2.1.5 Srundard Ammonium Thiocyanate Solution

    0.1 N.

    A-2.2 Procedure

    Dry the material to constant mass at 105 f 2’C. Weigh accurately about 0.4 g of the dried material and dissolve in 50 ml of water. Add with a pipette 50 ml of standard silver nitrate solution, 2 ml of concentrated nitric acid, I.5 ml of nitrobenzene and finally 2 ml of ferric alum indicator solution. Titrate the solution with standard ammonium thiocyanate solution to the first persistent colour change.

    A-2.3 Calculation

    Potassium bromide (as KBr), percent by mass, of dried material

    = 1.19 (50- v)

    M

    where V = volume in ml of standard ammonium

    thiocyanate solution used in the titration, and

    M = mass in g of the dried material taken for the test.

    NOTE - Presence of chlorides increases the results for

    potassium bromide and the results shall therefore be corrected.

    One gram of chloride (as Cl) is equivalent to 3.3.5 g of potassium bromide.

    A-3 DETERMINATION OF pH OF AQUEOUS SOLUTION

    A-3.1 Procedure

    Dissolve 5.0 g of the material in 100 ml of freshly

View more