3363 NTERNATIONAL STANDARD TSO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKIYHAPOIHA OPTAHW3ALWA HIO CTAHIAPTH3ALIWW·ORGANISATION INTERNATIONALE DE NORMALISATION Fluorochlorinated hydrocarbons for industrial use - Determination of acidity -- Titrimetric method Hydrocarbures fluorochlores a usage industriel-Determination de I'acidite -- Methodetitrimetrique First edition - 1976-09-01 SE31976 UDC 661.723-13/-16:543.241.5 Ref. No. ISO 3363-1976 (E) Descriptors :fluorochiorinated hydrocarbons,chemical analysis,determination of content,acidity,volumetric analysis Price based on 3pages FOREWORD ISO (the International Organization for Standardization) is a worldwide 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 StandardsbytheIsoCouncil. International Standard ISO 3363 was drawn up by Technical Committee ISO/TC 47, Chemistry, and circulated to the Member Bodies in February 1974. It has been approved by the Member Bodies of the following countries : Austria Hungary South Africa, Rep.of Belgium India Spain Bulgaria Ireland Switzerland Chile Israel Thailand Czechoslovakia Italy Turkey Egypt, Arab Rep. of Netherlands United Kingdom France Portugal U.S.S.R. Germany Romania No Member Body expressed disapproval of the document. ?InternationalOrganizationforStandardization,1976 Printed in Switzerland ISO3363-1976(E) INTERNATIONAL STANDARD Fluorochlorinated hydrocarbons for industrial use -- Determination of acidity -- Titrimetric method 1 SCOPEANDFIELDOFAPPLICATION 1% (V/V) of the bromocresol green solution (5.3) and neutralize with the sodium hydroxide solution (5.2)until This International Standard specifies a titrimetric method the colour changes to clear blue. for the determination of the acidity of fluorochiorinated hydrocarbons for industrial use. 5.2 Sodium hydroxide, 0,01N standard volumetric The method is applicable to products of which the acidity solution. is in the range 2 to 200 μmol of univalent acid per kilo- Standardize this solution with 0,01 N standard volumetric gram. hydrochloric acid solution under the conditions of the Two procedures are given; one applicable to products determination that are liquid at ordinary temperatures (R 11, R 113, etc.), and the other to products that are gaseous at ordinary 5.3 Bromocresol green, 1 g/l solution in 95% (V/V) temperatures (R12,R22,R114etc.). ethanol. 2 REFERENCES hydrocarbons for 6 APPARATUS ISO/R1393, Liquid halogenated industrial use - Determination of acidity. Ordinary laboratory apparatus and is0 2209, Liquid halogenated hydrocarbons for industrial 6.1 For products gaseous at ordinary temperatures use-Sampling. ISO3427， Gaseous halogenated hydrocarbons (liquefied See the figure for the arrangement of apparatus. gases) -- Taking of sample. 6.1.1 Needle valve, of any convenient type,with screw-thread union for connection to the sample cylinder. 3PRINCIPLE Extractionoftheacidityinthe fluorochlorinated 6.1.2 Bubble indicator, of glass, capacity about 15 ml. hydrocarbonbywater NOTE - The bubble indicator is used empty to check complete Titration of the acidity of the aqueous phase with a vaporization of the test portion. standard volumetric sodium hydroxide solution in the presence of bromocresol green as indicator. 6.1.3 Three tall-form Drechsel-type gas washing bottles, of capacity 100 ml, fitted with sintered glass disks. 4 SAMPLING 6.2 For both liquid and gaseous products. The laboratory sample of liquid products shall be collected by the method specified i