Reference number
ISO 2072:1981
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
1981-08
Retirada
Resumen
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
Informaciones generales
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Estado: RetiradaFecha de publicación: 1981-08Etapa: Retirada de la Norma Internacional [95.99]
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Edición: 1Número de páginas: 5
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Comité Técnico :ISO/TC 226ICS :71.100.10
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