Reference number
ISO 2072:1981
© ISO 2024
ISO 2072:1981
Aluminium oxide primarily used for the production of aluminium — Determination of zinc content — PAN photometric method
Edition 1
1981-08
Withdrawn
Withdrawn (Edition 1, 1981)

Abstract

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

General information

  • Status
     : Withdrawn
    Publication date
     : 1981-08
    Stage
    : Withdrawal of International Standard [95.99]
  • Edition
     : 1
    Number of pages
     : 5
  • Technical Committee :
    ISO/TC 226
    ICS :
    71.100.10 
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