ISO INTERNATIONAL STANDARD 78-2 Second edition 1999-03-01 Chemistry Layouts for standards - Part 2: Methods of chemical analysis ChimiePlans de normes - Partie 2: Méthodes d'analyse chimique Tso Reference number ISO 78-2:1999(E) THS under Not for Resale ISO 78-2:1999(E) Foreword ISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(lSO 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 liaison with isO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. General methods. changes in Part 3 of the ISO/IEC Directives. Part 2: Methods of chemical analysis 一 Part 3: Standard formolecularabsorption spectrometry Part 4: Standard for atomic absorption spectrometric analysis NOTE Part 1 was planned but never published Annex A forms an integral part of this part of ISO 78. Annexes B and C are for information only. @ISO1999 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic nternationalOrganizationforStandardization Case postale 56. CH-1211 Geneve 20· Switzerland nternet [email protected] Printed in Switzerland ional Organization for Standardizatior @ ISO ISO78-2:1999(E) Introduction ISO/lEC Directives for the technical work of ISO, which gives general guidance, and using the layout of which details are given on the following pages. It should always be remembered, in making use of this layout, that it is for guidance only. It should be adapted to suit any special requirements. There may be no need for all the subdivisions provided: those not required should be disregarded. With the object of helping to solve problems of drafting and layout which arise in drawing up standards for methods of chemical analysis, ISO/TC 47 has established a series of standard layouts: layout for a standard method of chemical analysis, with notes on its application (IsO 78-2); standard layouts for instrumental analyses, with notes on their application (IsO 78-3 and IsO 78-4) A standard for a chemical product should form a consistent whole. In addition to specifying the characteristics analysis(testmethod)maybeincorporatedinthetextofastandardforachemicalproduct.Testmethodsmaybe a separate standard if it is likely to be referred to in a number of other standards. This will shorten the text of the standard for the chemical product; and, if a general method of chemical analysis applicable to the product exists, the standard for the product may merely refer to it. The adoption of a standard form of layout and drafting ensures: that no important point is overlooked in the preparation of the standard; that the various items of information to be included in the standard are always given in the same order; that any desired clause may be found rapidly, whatever the origin or scope of the standard (this is particularly that each International Standard or other international document prepared in this field is drafted in terms which are as clear as possible. ili