ISO INTERNATIONAL STANDARD 3696 First edition 1987-04-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXKAYHAPOAHAR OPIAHM3ALMR NO CTAHAAPTM3AWN Water for analytical laboratory use -- Specification and test methods Eau pour laboratoire a usage analytique - Specification et methodes d'essai Reference number ISO 3696:1987 (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 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 3696 was prepared by Technical Committee ISO/TC 47, Chemistry. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. International Organization for Standardization, 1987 Printed in Switzerland Coovriaht International Oraanization for Standardizatior ISO3696:1987(E) INTERNATIONAL STANDARD Water for analytical laboratory use --- Specification and test methods Scope and field of application 0,2 μm to remove particulate matter or redistillation from a fused silica apparatus). This international Standard specifies the requirements and cor- responding test methods for three grades of water for laboratory use for the analysis of inorganic chemicals. Grade 2 It is not applicable to water for organic trace analysis,to water Very low in inorganic, organic or colloidal contaminants and for the analysis of surface active agents, or to water for suitable for sensitive analytical purposes, including atomic biological or medical analysis. absorption spectrometry(AAS)andthe determination of con- NOTE -- For some purposes (for example for certain analytical stituents in trace quantities; should be produced, for example, by multiple distillation, or by deionization or reverse osmosis methods or for tests in which the water is required to be sterile or followed by distillation. pyrogen-free or of specified surface tension), additional specific tests and further purification or other treatment may be necessary. Grade 3 2 Description Suitableformostiaboratorywetchemistryworkandprepara- The materiai shall be aclear,colourlessliquid as assessed by tionofreagentssolutions; shouldbeproduced,forexample,by visualinspection. single distillation, by deionization, or by reverse osmosis. Unless otherwise specified, it should be used for ordinary analytical work. Classification NOTE -- It is assumed that the initial feed stock water ispotable and This International Standard covers three grades of water as reasonably pure.If it is heavily contaminated in any respect, some follows : pretreatment maybenecessary. Grade 1 Essentially free from dissoived or colloidal ionic and organic contaminants and suitable for the most stringent analytical 4 Requirements requirements including those of high-performance liquid chromatography; should be produced by further treatment of The material shall comply with the appropriate requirements of grade 2 water (for example reverse osmosis or deionization the table. Testing for compliance shall be carried out by means followedbyfiltrationthrougha membranefilterofporesize ofthemethodsspecified inclause7. 1
ISO 3696 1987 Water for analytical laboratory use — Specification and test methods
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