4851903 0026941 62-E9E International Standard (ISO 3634 C- 89-/5 Vegetable products -- Determination of chloride content Produits dérives deslegumes-Determination dela teneuren chlorures First edition -- 1979-07-15 UDC 635 : 543.848 Ref. No.ISO 3634-1979 (E) 634-1979 (E) Descriptors :vegetableproducts, chemicalanalysis,chiorides,determinationofcontent. Standardizatior Price based on 3 pages bZ-hEgE 2h69200 E06T59h Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes (Iso member bodies). The work of developing Interna- tional 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 3634 was developed by Technical Committee ISO/TC 34, Agricultural food products, and was circulated to the member bodies in May 1978. Australia Iran South Africa, Rep. of Bulgaria Israel Spain Canada Malaysia Thailand Czechoslovakia Netherlands Turkey France Peru USA Germany, F.R. Poland Yugoslavia Hungary Portugal India Romania No member body expressed disapproval of the document. Copyrighfinternational Organization ior Standardization'on for Standardization, 1979 Not for Resale PrintedinSwitzerland ISO3634-1979 (E) INTERNATIONALSTANDARD b2-hE9E Eh69200 E06T59h T Vegetable products - Determination of chloride content Scope and field of application Dissolve 9,72 g of potassium thiocyanate (KSCN) in water and dilute to1000 ml ina volumetric flask. This International Standard specifies a method for the deter- mination of the chioride content of vegetable products. Standardize this solution with the silver nitrate solution (4.3) in the presence of the ammonium iron() sulphate solution (4.5). 1.1 Special case 4.5 Ammoniumiron(lll)sulphate, If the product contains natural anthocyanin pigments, the [(NH4)2SO4.Fe2(S04)3.24H20], saturated aqueous solution, method is applicable with the modifications specified in clause 8. 1,42 g/ml, per 100 ml of the solution). 2 Definition 5 Apparatus chloride content of vegetable products : The total chloride content determined according to the method specified and ex- Usual laboratory apparatus, and in particular : pressedasapercentagebymass ofsodium chloride. 5.1 Homogenizer, or mortar [for thick, pasty or solid pro- ducts (6.1.3)). Principle 5.2 Beaker, 250 ml. Precipitation of chloride by the addition of an excess of a stan- dard volumetric silver nitrate solution and titration of this 5.3Volumetric flask, 250 ml, complying with Iso 1042 excessof silvernitratewithastandardvolumetricpotassium thiocyanate solution. 5.4 Pipettes, one-mark, to deliver respectively 1 - 3 - 5 - 20 ml, complying with ISO 648. 4 Reagents 5.5 Conical flask, 200 ml. All reagents shall be of recognized analytical grade. The water used shall be distilled water or water of at least equivalent puri- 5.6 Burettes, 25 mi, complying with ISO/R 385. ty. 6 Procedure 4.1 Nitrobenzene. 6.1 Preparation of test sample 4.2 Nitric acid, about 4 N solution. 6.1.1 Products containing distinct solid and liquid Mix one volume of nitric acid (02o 1,39 to 1,42 g/ml) with three phases volumes of water. If a specification exists, carry out the determination on the 4.3 Silver nitrate, 0,100 0 N standard volumetric solution. phase indicated in the specification. If there is no specification, and in the case of freshly prepared products, mix the laboratory Dry silver nitrate (AgNO3) for 2 h at 150 °C and allow to cool in samplethoroughly and carry out the determinationonthe a desiccator. Dissolve 16,989 0 g of the dried silver nitrate in h