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  • Status :  Withdrawn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
  • Edition : 1
    Number of pages : 5
  • :
    ISO/TC 226
    Materials for the production of primary aluminium
  • 71.100.10
    Materials for aluminium production

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