ISO 2072:1981
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Aluminium oxide primarily used for the production of aluminium Determination of zinc content PAN photometric method
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09-05-2019
English, French
01-08-1981
The 1-(2-pyridilazo)-2-naphthol method is applicable to products having zinc contents in the range between 0,002 % (m/m) and 0,12 % (m/m). Alkaline fusion of a test portion, and dissolution of the fused mass in nitric acid. Separation of the zinc in the form of its thiocyanate by extraction with 4-methylpentan-2-one. Re-extraction of the zinc with an aqueous hydrochloric acid solution. Formation of the PAN-zinc complex, at pH 7,5, in the presence of tartaric acid, sodium thiosulphate and 1-nitrose-2-naphthol-3,6-du
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