6227 International Standard (ISo INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION+MEKAYHAPOAHAA OPTAHW3ALMA NO CTAHAAPTM3AWW-ORGANISATION INTE RNATIONALE DE NORMALISATION Chemical products for industrial use - General method for determination of chloride ions - Potentiometric method Produits chimiques a usage industriel -- Methode generale de dosage des ions chlorure - - Methode potentiometrigue First edition - 1982-09-01 UDC 661 : 543.257.1 : 546.131 Ref. No. ISO 6227-1982 (E) Descriptors , chemical analysis, determination, ions, chlorine, potentiometric analysis, industrial products. chemicalcompounds, Price based on 8 pages Copyright International Organization for Standardization IsefromIHS Notfor Resale Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (Iso member bodies). The work of developing inter- national Standards is carried out through iso technical committees. Every member body interested in a subject for which a technicat committee has been set up has the 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 6227 was developed by Technical Committee ISO/TC 47, Chemistry, and was circulated to the member bodies in August 1981. It has been approved by the member bodies of the following countries : Austria India South Africa, Rep. of Belgium Italy Switzerland China Korea, Rep. of Thailand Egypt, Arab Rep. of Netherlands United Kingdom France Poland USSR Germany, F. R. Portugal Hungary Romania No member body expressed disapproval of the document. ? International Organization for Standardization, 1982 Printed in Switzerland Copyright International Organization for Standardization from IHS Not for Resal ISO 6227-1982 (E) INTERNATIONAL STANDARD Chemical products for industrial use - General method for determination of chloride ions Potentiometric method Scope 4. Reagents This International Standard specifies a general potentiometric During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivatent purity. method for the determination of chloride ions in solutions prepared from chemical products for industrial use. 4.1 Acetone. The preparation of the test solution and any modifications to the general procedure should be dealt with in the specific Inter- 4.2 Nitric acid, 1,40 g/ml, about approximately national Standard for the chemical product to which the 68 % (m/m) solution. method is to be applied. 4.3 Potassium nitrate, solution saturated at room temperature. Field of application 2 4.4 Silver nitrate, solution, c(AgNO3) = 0,1 mol/t approx- The method is applicable to test solutions having chloride ion imately. concentrations, expressed in milligrams per litre, of between 1 and 1 500. The method may be used to determine the total Dissolve 8,5 g of silver nitrate in a 500 ml one-mark volumetric chlorine contained in chemical products after transforming it, if flask, dilute to the mark and mix. necessary, into chloride ions by a suitable process. The method has an absolute error, expressed as milligrams of chlorine, of Store the solution in a dark glass bottle. 0,1 to 1 mg, according to the concentration of the standard volumetric solution used. 4.5 Silver nitrate, solution, c(AgNO3) =- 0,01 or 0,004 mol/l approximately. Under certain conditions, it is possible to determine bromide and iodide ions either simultaneously or separately. If chloride Select the appropriate solution according to the information in only is to be determined, bromide and iodide may be eliminated the table relating to 6.1. by the method described in annex C. Prepare the selected solution at the time of use from the silver Cyanides, sulphides, thiocyanates, 'ammonium and iron(l) nitrate soluti