5664 (ISO International Standard INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAH OPrAHM3ALWH RO CTAHAAPTW3ALWW+ORGANISATION INTE RNATIONALE DE NORMALISATION Water quality - Determination of ammonium - Distillation and titration method Qualite de I'eau -- Dosage de I'ammonium -- Methode par distillation et titrimetrie First edition - 1984-05-15 UDC 543.342 : 543.24 Ref. No. 1SO 5664-1984 (E) Descriptors : water, tests, determination of content, ammonium ion, distllation method, titration. Price based on 3 pages permitted without license from IHS Not for Resale Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (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 authorized 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 5664 was developed by Technical Committee ISo/TC 147, Water quality, and was circulated to the member bodies in December 1982. It has been approved by the member bodies of the following countries: France Australia New Zealand Austria Hungary Poland Belgium India Romania Iran South Africa, Rep. of Canada Iraq Spain China Italy Sweden Czechoslovakia Japan Switzerland Denmark Korea, Dem. P. Rep. of Thailand Egypt, Arab Rep. of Mexico United Kingdom Finland Netherlands USSR The member body of the following country expressed disapproval of the document on technical grounds: Germany, F.R. @ International Organization for Standardization, 1984 Printed in Switzerland Copyright international Organization for Standardization ng permited without license from IHS Not for Resale ISO 5664-1984 (E) INTERNATIONAL STANDARD Water quality - Determination of ammonium Distillation and titration method Scope Water, ammonium-free, prepared by one of the follow- 4.1 ing methods. This International Standard specifies a distillation and titration method for the determination of ammonium in raw, potable 4.1.1 lon exchange method and waste water. Pass distilled water through a column of strongly acidic cation- 2 Field of application exchange resin (in the hydrogen form) and collect the eluate in a glass bottle provided with a well-fitting glass stopper. Add about 10 g of the same resin to each litre of eluate for storage Range 2.1 purposes. An ammonium nitrogen content of up to 10 mg in the test por- tion may be determined. Using a 10 ml test portion, this cor- 4.1.2 Distillation method responds to a sample concentration of up to gn = 1 000 mg/l. Add 0,10 ± 0,01 m! of sulfuric acid solution (α = 1,84 g/ml) to 1. 000 ± 10 ml of distilled water and redistil in an all glass ap- 2.2 Limit of detection paratus. Discard the first 50 ml of distillate, and then collect the distillate in a glass bottle provided with a well-fitting glass stop- A practically determined (4 degrees of freedom) limit of detec- per. Add about 10 g of strongly acidic, cation exchange resin tion, using a 250 ml test portion, is gn = 0,2 mg/l. (in the hydrogen form), to each litre of collected distillate. 2.3 Sensitivity 2Hydrochloric acid, g =- 1,18 g/ml. 4.2 Using a 100 ml test portion 1,0 ml of 0,02 mol/1 hydrochloric acid is equivalent to Qn = 2,8 mg/l. 4.3 Hydrochloric acid, standard volumetric solution, c(HCI) = 0,10 mol/1. 2.4 Interferences Prepare this solution by diluting the hydrochloric acid (4.2). The main possible interference arises from urea which, under the conditions specified, will distil as ammonia thus causing commercial solutions of guaranteed concentration may be high results. Interference will al