ISO INTERNATIONAL STANDARD 21438-1 Second edition 2022-05 Workplace atmospheres : Determination of inorganic acids by ion chromatography Part 1: Non-volatile acids (sulfuric acid and phosphoric acid) Air des lieux de travail - Détermination des acides inorganiques par chromatographie ionique Partie 1: Acides non volatils (acide sulfurique et acide phosphorique) Reference number IS0 21438-1:2022(E) ISO @IS02022 IS0 21438-1:2022(E) COPYRIGHT PROTECTED DOCUMENT IS02022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may the internet or an intranet, withoutpriorwrittenpermission.Permission can be requested from eitherIso at the addressbelow or Iso's member body in the country of the requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214Vernier,Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org PublishedinSwitzerland i @ IS0 2022 - All rights reserved