ISO-2072 › Aluminium oxide primarily used for the production of aluminium -- Determination of zinc content -- PAN photometric method
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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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71.100.10 (Materials for aluminium production)
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Document Number
ISO 2072:1981
Revision Level
1ST EDITION
Status
Superseded
Publication Date
Aug. 1, 1981
Committee Number
ISO TC 47/SC 7