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Sodium hydroxide for industrial use -- Sampling -- Test Sample -- Preparation of the main solution for carrying out certain determinations
Indicates the conditions under which the test sample shall be prepared and relates to particular properties which require particular precautions: the samples shall be taken rapidly in a dry atmosphere, storage in an airtight bottle.
The bottle shall be made from an inert material such as polyethylene.
Preparation of the main solution with distilled carbonate-free water.
If the silica content is to be determined, the test portion shall be dissolved in a container made from silica-free material such as polyethylene or silver.
Cancels and replaces ISO Recommendations R 977/1969 and R 978/1969.
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