3856/4 (ISO International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAA OPTAHM3AUWA NO CTAHAAPTW3AUMWORGANISATION INTE RNATIONALE DE NORMALISATION Paints and varnishes - Determination of "soluble" metal content Part 4: Determination of cadmium content -- Flame atomic absorption spectrometric method and polarographic method Peintures et vernis -- Determination de la teneur en métaux 《 solubles) -- Partie 4: Détermination de la teneur en cadmium Methode par spectrometrie d'absorption atomique dans la flamme etmethode polarographique Second edition -- 1984-11-01 ISO 3856/4-1984 (E) UDC 667.6 : 543.422 : 546.48 Ref. No. ISO 3856/4-1984 (E) Descriptors: paints, varnishes, printing inks, pigments, chemical analysis, determination of content, soluble matter, cadmium, spectrochemical analysis, polarographic methods. Price based on 6 pages Copyright International Organization for Standardization 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 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 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. They are approved in accordance with IsO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 3856/4 was prepared by Technical Committee ISO/TC 35, Paints and varnishes. Is0 3856/4 was first published in 1980. This second edition cancels and replaces the first edition, of which it constitutes a thorough revision. ? International Organization for Standardization,1984 Printed in Switzerland Copyright International Organization for Standardization from IHS Not for Resale ISO 3856/4-1984 (E) INTERNATIONAL STANDARD Paints and varnishes -- Determination of ""soluble" metal content - Part 4: Determination of cadmium content - Flame atomic absorption spectrometric method and polarographic method O Introduction 3 Flame atomic absorption spectrometric method This International Standard is a part of ISO 3856, Paints and varnishes --- Determination of "soluble" metal content. 3.1 Principle Aspiration of the test solution into an acetylene/air flame 1 Scope and field of application Measurement of the absorption of the selected spectral line emitted by a cadmium hollow-cathode or cadmium discharge This part of ISO 3856 describes two methods for the deter lamp, in the region of 228,8 nm. mination of the cadmium content of the test solutions prepared according to ISO 6713 or other suitable International Stan- 3.2 Reagents and materials dards. During the analysis, use only reagents of recognized analytical grade and only water of at least grade 3 purity according to mium contents in the range of about 0,05 to 5 % (m/ m). ISO 3696. The flame atomic absorption spectrometric method (AAS) (clause 3) should be used as the referee method in cases of 3.2.1 Hydrochloric acid, c(HCl) = 0,07 mol/t. dispute. Other methods can be used by agreement between the Use the hydrochloric acid, identical to that used for the interested parties. A polarographic method is given in clause 4. preparation of the test solutions in accordance with Iso 6713. (See 3.4.2.) References 2 3.2.2 Acetylene, commercial grade, in a steel cylinder. Burettes Part 1: ISO385/1, Laboratory glassware General requirements. 1) 3.2.3 Compressed air. iso 648, Laboratory glassware - One-mark pipettes. 3.2.4 Cadmium, standard stock sotution containing 1 g of Iso 1042, Laboratory glassware Cd per litre. One-mark volumetric flasks. Either