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Trisodium Phosphate [CHD 1: Inorganic Chemicals]

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Trisodium Phosphate [CHD 1: Inorganic Chemicals] इंटरनेट मानक 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. “जान का अधकार, जी का अधकार” “परा को छोड न 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 573 (1992): Trisodium phosphate [CHD 1: Inorganic Chemicals] “ान $ एक न भारत का नमण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “ान एक ऐसा खजाना > जो कभी चराया नह जा सकताह ै”ै Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 573 : 1992 (Reaffirmed 2010) Indian Standard TRISODIUM PHOSPHATE — SPECIFICATION (Fourth Revision) Second Reprint OCTOBER 2001 UDC 661.833.455.3 © BIS 1992 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADU R SHAH ZAFAR MARG NEW DELHI 110002 June 1992 Price Group 5 AMENDMENT NO. 1 JULY 1993 TO IS 573 : 1992 TRISODIUM PHOSPHATE — SPECIFICATION ( Fourth Revision) ( Page 2, Table 1 ) — Add the following note at the end of Table 1: 'NOTE — The requirements for soluble silica ( as SiO2 ) and chloride ( as Cl ) for trisodium phosphate, technical, dodecahydrate grade shall be special requirements only for the material intended to be used for softening water and for prevention of hard boiler scale.' ( CHD 003 ) Printed at New India Printing Press, Khurja, India General Inorganic Chemicals Sectional Committee, CHD 003 FOREWORD This Indian Standard ( Fourth Revision ) was adopted by the Bureau of Indian Standards, after the draft finalized by the General Inorganic Chemicals Sectional Committee had been approved by the Chemical Division Council. This standard was originally published in 1954 and then subsequently revised in 1964, 1973 and 1985. In the original standard, three types of trisodium phosphate, namely, anhydrous, monohydrate and dodecahydrate were covered. These were retained in the first revision. However, in the second revision, the monohydrate type of trisodium phosphate was deleted as it was not being manufactured in the country. In the second revision, analytical reagent grade of trisodium phosphate was added and a new requirement of free sodium hydroxide was incorporated. During the third revision, a new requirement of free alkalinity was prescribed for dodecahydrate type of trisodium phosphate, deleting the requirements of carbonates and free sodium hydroxide for this type. In this revision, new requirements of insolubles, soluble silica and chloride contents have been prescribed for trisodium phosphate, dodecahydrate along with the relevant test methods. Also, the methods for determination of carbonate alkalinity, phosphate, carbonate, free sodium hydroxide and total alkalinity have been suitably modified. When stored under ordinary conditions, the dodecahydrate may lose some water of crystallization. Any loss in water will result in an assay of more than 100 percent trisodium phosphate on the basis of the assay of sodium phosphate dodecahydrate but will not appreciably affect determination of the relative amount of other characteristics. 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 shall be the same as that of the specified value in this standard. IS 573 : 1992 Indian Standard TRISODIUM PHOSPHATE — SPECIFICATION ( Fourth Revision ) 1 SCOPE 4.2 The analytical grade shall be of dodecahydrate This standard prescribes requirements and methods of type only. sampling and test for trisodium phosphate. 5 REQUIREMENTS 2 REFERENCES 5.1 Description The Indian Standards listed below are necessary adjuncts to this standard: The material shall be in the form of white crystalline powder or in the form of easily friable small lumps. IS No. Title 5.2 The material shall comply with the requirements 264 : 1976 Nitric acid ( second revision ) given in Table 1 when tested according to the methods prescribed in Annex A. Reference to the relevant 265 : 1987 Hydrochloric acid (third revision ) clauses of Annex A is given in col 6 of the table. 915 : 1975 One-mark volumetric flask (first revision ) 6 PACKING AND MARKING 1070 : 1977 Water for general laboratory use 6.1 Packing ( second revision ) 2088 : 1983 Methods for determination of arsenic The material shall be packed as agreed to between the ( second revision) purchaser and the supplier. 2263: 1979 Methods of preparation of indicator 6.2 Marking solutions for volumetric analysis (first revision ) The packages shall be legibly marked with the follow• 2316:1990 Methods of preparation of ing information: standard solutions for colorimetric a) Name, grade and type of the material; and volumetric analysis ( second revision) b) Mass of the material; 4905 : 1968 Methods for random sampling c) Indication of the source of manufacture; d) Year of manufacture; and 3 GRADES e) Lot number in code or otherwise to enable the batch of manufacture to be traced from The material shall be of the following two grades: records. a) Technical (Tech) - For use in detergent mix• 6.2.1 In case of analytical reagent grade, the analysis tures, softening water, prevention of hard boiler of the material in respect of the characteristics laid scale, tanning of leather, clarifying sugar, laun• down in col 5 of Table 1 shall also appear on the dering, manufacture of paper, in photographic developers, and in kier boiling; and label. b) Analytical (AR) - For use as a reagent in 6.2.2 The packages may also be marked with the laboratory. Standard Mark. 4 TYPES 7 SAMPLING 4.1 The technical grade material shall be of two types, The method of drawing representative samples of namely: the material, number of tests to be performed and the criteria for finding the conformity of the material to a) Dodecahydrate, and the requirements of this specification shall be as b) Anhydrous. prescribed in Annex B. 1 IS 573 : 1992 Table 1 Requirements for Trisodium Phosphate (Clause 5.2) Sl Characteristic Requirement for Grade Method of No. Test (Ref (Tech) (AR) to Cl No. Dodeca- in Annex A ) Dodeca- Anhy- hydrate hydrate drous (2) (1) (3) (4) (5) (6) i) Matter insoluble in 0.20 0.50 0.01 A-2 water, percent by mass, Max 1) ii) Phosphates (as P2O3), 17.50 41.0 18.3 A-3 or percent by mass, Min A-42) 2.0 iii) Carbonates (as Na2CO3), - - A-4 percent by mass, Max iv) Carbonate alkalinity 3.00 — – A-4 (as NaOH), percent by mass, Max v) Free sodium hydroxide — 3.2 2.5 A-4 (as NaOH), percent by mass, Max vi) Total alkalinity 4.5 — — A-4 (as NaOH), percent by mass, Max vii) Soluble iron compounds 0.009 0.02 0.001 A-5 (as Fe), percent by mass, Max viii) Nitrogen compounds - - 0.001 A-6 (as N), percent by mass, Max ix) Sulphates (as SO4), - - 0.01 A-7 percent by mass, Max x) Arsenic (as As2O3), - - 0.000 5 A-8 percent by mass, Max xi) Heavy metals (as Pb), - - 0.001 A-9 percent by mass, Max xii) Soluble silica (as SiO2), 0.1 - 0.05 A-10 percent by mass, Max xiii) Chloride (as Cl), 0.1 - 0.05 A-11 percent by pass, Max 1)On dry ??? at 400°C. 2)The method prescribed at A-4 is reommended for routine analysis, is case of dispute, the method prescribed at A-3 shall be referee method. 2 IS 573 : 1992 ANNEX A (Clause 5.2) METHODS OF TEST FOR TRISODIUM PHOSPHATE A-3.1.2 Citro-Molybdate Reagent A-1 QUALITY OF REAGENTS Prepare the citro-molybdate reagent according to the Unless specified otherwise, 'pure chemicals' and dis• following procedure: tilled water (see IS 1070: 1977) shall be employed in tests. a) Dissolve 150 g of sodium molybdate (Na MoO . 2H O) in 400 ml of water. NOTE — 'Pure chemicals' shall mean chemicals that do not 2 4 2 contain impurities which affect the results of analysis. b) Dissolve 250 g of citric acid in 250 to 300 ml of water and 280 ml of concentrated hydro• A-2 DETERMINATION OF MATTER chloric acid (see IS 265 : 1987). To this pour INSOLUBLE IN WATER with stirring the solution prepared in (a), cool and filter through a filter pad. A slight green• A-2.1 Procedure ish colour is obtained on mixing, which may Weigh accurately about 10 to 20 g of the material and deepen when exposed to sunlight. Add in dissolve in about 150 ml of water. Filter the insoluble drops a 0.5 percent (m/v) solution of potas• matter, if any, through a tared filter paper or a sintered sium bromate to discharge the colour. Store glass crucible (G. No. 4) or a Gooch crucible. Wash the the solution in coloured, air-tight, stoppered residue thoroughly with water till it is free from all glass bottles in the dark. soluble compounds and dry at 105°C to 110°C. Cool in a desiccator and weigh to constant mass. A-3.1.3 Mixed Indicator Solution Mix 3 volumes of alcoholic phenolphthalein solution A-2.2 Calculation and 1 volume of alcoholic thymol blue solution (see Table 3 of IS 2263: 1979).
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