ISO INTERNATIONAL STANDARD 11212-1 First edition 1997-03-15 Starch and derived products -- Heavy metals content - Part 1: Determination of arsenic content by atomic absorption spectrometry Amidons, fécules et produits dériveés -- Teneur en metaux lourds - Partie 1: Détermination de la teneur en arsenic par spectrométrie d'absorption atomique ISO Referencenumber ISO 11212-1:1997(E) No reproduction or networking permitted without license from IHS Not for Resale ISO 11212-1:1997(E) 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 rightto be represented on that committee. International organizations, governmental and non- governmental, in liaison with Iso, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 11212-1 was prepared by Technical Committee ISO/TC 93, Starch (including derivatives and by-products). IsO 11212 consists of the following parts, under the general title Starch and derived products - Heavy metals content: Part 1: Determination of arsenic content by atomic absorption spectrometry Part 2: Determination of mercury content by atomic absorption spectrometry Part 3: Determination of lead content by atomic absorption spectrometry with electrothermal atomization Part 4: Determination of cadmium content by atomic absorption spectrometry with electrothermal atomization Annex A of this part of iSO 11212 is for information only. ISO1997 All rights reserved.Unless otherwisespecified,nopartofthispublication may bereproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International OrganizationforStandardization Case postale 56. CH-1211 Geneve 20 . Switzerland Internet [email protected] X.400 C=ch; a=400net; p=iso; 0=isocs; S=central Printed in Switzerland ii Copyright International Organization for Standardization Not for Resale ISO 11212-1:1997(E) INTERNATIONAL STANDARD ISO Starch and derived products - Heavy metals content - Part 1: Determination of arsenic content by atomic absorption spectrometry 1 Scope This part of isO 11212 specifies a method for the determination of the arsenic content of starch, including derivatives and by-products, by atomic absorption spectrometry with hybride generation. The hybride generators currently available use very different techniques; it is thus impossible to propose a comprehensive method likely to ensure the attainment of satisfactory results on all types of apparatus. Each analyst should therefore optimize the conditions of use of his/her own apparatus on the basis of general or particular instructions. 2 Definition For the purposes of this part of IsO 11212, the following definition applies. 2.1 arsenic content: Quantity of arsenic determined in accordance with the conditions specified in this method and expressed as arsenic (As), in micrograms per kilogram of the product as received. 3Principle Measurement of the absorbance at a wavelength of 193,7 nm. Determination of the concentration of arsenic in the sample by means of a calibration curve. 4 Reagents Use only reagents of recognized analytical grade and distilled water or water of equivalent purity. 4.1 Nitric acid (P20 = 1,38 g/ml). 4.2 Hydrogen peroxide, 30 % (V/M) solution. nal Organization for Standardization Not for Res