ISO 1983:1977
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Nitric acid for industrial use Determination of sulphated ash Gravimetric method
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05-10-2019
English, French
11-01-1977
The principle of the method consists inevaporation of a test portion in a platinum dish, conversion of the residue to sulphates by treatment with sulphuric acid; ignition in an electric furnace, controlled at (800 +- 25) C, and weighing. Replaces ISO Recommendation R 1983-1971.
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