2- 26 2 695h200 E06T5h S2-2EEE NTERNATIONAL STANDARD .ISO 3332 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION·ME)KAYHAPOIHAA OPIAHW3ALIWIO CTAHJIAPTW3ALIWW·ORGANISATION INTERNATIONALE DE NORMALISATION Ammonium sulphate for industrial use - Determination of ammoniacal nitrogen content -- Titrimetric method after distillation Sulfate d'ammonium a usage industriel -- Dosage de I'azote ammoniacal -Methode titrimetrique apres distillation First edition -- 1975-07-15 ISO 3332-1975 (E) Ref.No.ISO3332-1975 (E) UDC 661.522 : 546.171 : 543.24 Descriptors : ammonium sulphate, chemical analysis, determination of content, nitrogen, volumetric analysis. Price based on 4 pages COPYRIGHT 2oo0 International Organization For Standardization Information Handling Services, 2oo0 A 3332-75 025h200 FOREWORD Iso (the international Organization for Standardization) is a woridwide federation of national standards institutes (IsO Member Bodies). The work of developing International Standards is carried out. through ISO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the iSO Council. International Standard iSO 3332 2wasdrawnup byTechnical Committee ISO/TC 47, Chemistry, and circulated to the Member Bodies in March 1974. It has been approved by the Member Bodies of the following countries : Hungary Austria South Africa, Rep. of Belgium India Spain Switzerland Bulgaria Ireland Chile Israel Thailand Turkey Czechoslovakia Italy Egypt, Arab Rep. of Netherlands United Kingdom New Zeatand U.S.S.R. France Poland Germany Yugoslavia NoMemberBodyexpresseddisapprovalofthedocument. InternationalOrganizationforStandardization,1975 PrintedinSwitzerliand COPYRIGHT 2000 International Organization For Standardization Information Handling Services, 2000 ISO3332-1975(E) INTERNATIONAL STANDARD 52-2EEE T25h200 E0659h Ammonium sulphate for industrial use - Determination of ammoniacal nitrogen content -- Titrimetric method after distillation 1 SCOPEANDFIELDOFAPPLICATION 4.1.2 Splash head (B), with male joints and parallel inlet and outiet into which is fused a cylindrical dropping funnel This International Standard specifies a titrimetric method, (C),capacity 50 ml. after distillation, for the determination of the ammoniacal nitrogen content of ammonium sulphate for industrial use. 4.1.3 Liebig condenser (D), effective length about 400 mm, fitted with a female joint at the inlet and a male joint at the outlet. 2 PRINCIPLE 4.1.4 Conical flask (E), capacity 500 ml, with a female Distillation of the ammonia after displacement by an alkali joint, fitted with two side bulbs. solution;absorptioninanexcessofstandardvolumetric sulphuric acid solution and back-titration with standard 4.1.5 Spring clamps (F). volumetric sodium hydroxide solution in the presence of an indicator. 5 PROCEDURE1) 5.1 Test portion 3 REAGENTS Weigh, to the nearest 0,001 g, about 10g of the test During the analysis, use only reagents of recognized sample. analytical reagent grade and only distilled water or water of equivalent purity. 5.2 Blank test 3.1 Sodium hydroxide, 450 g/1 solution. Carry out a blank test at the same time as the determination, following the same procedure and using the 3.2 Sulphuric acid, 0,5 N standard volumetric solution. same quantities of all the reagents as used for the determination. 3.3 Sodium hydroxide, 0,5 N standard volumetric sol- 5.3 Determination ution. 5.3.1 Preparation of the sample solution 3.4Mixedindicator,ethanolic solution Place the test portion (5.1) in a 500 m! one-mark Dissolve 0,1 g of methyl red in about 50 ml of 95 % (V/V) volumetric flask, dissolve in water, dilute to the