3856/6 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION·MEKAYHAPOAHAA OPTAHW3ALMA NO CTAHAAPTW3AUMM-ORGANISATION INTERNATIONALE DE NORMALISATION ANsl Intarnar Doc sec Paints and varnishes - Determination of "soluble" metal content Part 6: Determination of total chromium content of the liquid portion of the paint -- Flame atomic absorption spectrometric method Peintures et vernis--Détermination de la teneur en metaux《solubles) -Partie6:Determinationdelateneurtotaleenchrome delafractionliquidedelapeinture--Methodepar spectrometried'absorption atomiquedans la flamme Second edition -- 1984-11-01 ISO 3856/6-1984 (E) UDC 667.6 : 543.422 : 546.76 Ref.No.ISO3856/6-1984(E) Descriptors: paints, varnishes,printing inks,pigments, chemical analysis, determination of content,solublematter,chromium,atomic absorption spectrometry. Price based on 3 pages Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through iSo technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with so, 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. They are approved in accordance with iSO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 3856/6 was prepared by Technical Committee ISO/TC 35, Paints andvarnishes. IS0 3856/6 was first published in 1980. This second edition cancels and replaces the first edition, of which it constitutes a thorough revision. C International Organization for Standardization, 1984 Printed in Switzerland Copvriaht International Oroanization for Standardizatior ISO3856/6-1984(E) INTERNATIONALSTANDARD Paints and varnishes - Determination of "soluble" metal content Part 6: Determination of total chromium content of the liquid portion of the paint t - Flame atomic absorption spectrometric method o Introduction 3 Principle This International Standard is a part of Iso3856, Paints and Aspiration of the test solution into a dinitrogen monoxide/ varnishes--Determination of"soluble"metal content. acetyleneflame.Measurement of the absorption of the selectedspectral line,emittedbyachromiumhollow-cathode lamp or chromium discharge lamp, in the region of 357,9 nm. Scope and field of application This part of ISo 3856 describes a flame atomic absorption 4 Reagents and materials spectrometric (AAS) method for the determination of the total chromium contentofthe liquid portionofthepaint,prepared in During the analysis, use only reagents of recognized analytical accordance with sub-clause 9.3 of Iso 6713 or other suitable grade and only water of at least grade 3 purity according to International Standards. ISO 3696. The method is applicable to paints having total chromium con- tents in the liquid portion in the range of about 0,05 to 5 % 4.1 Hydrochloric acid, c(HCI) = 0,07 mol/1. (m/m). Use the hydrochloric acid, identical to that used for the Other methods can be used by agreement between the preparation of the test solutions in accordance with ISo 6713. interested parties but this AAS method is the referee method in (See 6.2.) cases of dispute. 4.2 Acetylene, commercial grade, in a steel cylinder. References 4.3 Dinitrogen monoxide, commercial grade, in a steel cylinder. Iso 385/1,Laboratory glassware Burettes Part 1: General requirements. 1) 4.4 Chromium, standard stock soiution containing 100 mg ISo 1042,Laboratory glassware of Cr per litre. One-markvolumetric flasks. Either ISO 3696, Water for laboratory use - Specifications.2) a) transfer the contents of an ampoule of sta