ISO 2072:1981 主要用于制铝的氧化铝.锌含量的测定.过氧硝酸乙酰酯（PAN）光度法

标准编号：ISO 2072:1981

中文名称：主要用于制铝的氧化铝.锌含量的测定.过氧硝酸乙酰酯（PAN）光度法

英文名称：Aluminium oxide primarily used for the production of aluminium — Determination of zinc content — PAN photometric method

发布日期：1981-08

标准范围

1-（2-吡啶偶氮）-2-萘酚法适用于锌含量在0002%（m/m）和0.12%（m/m）之间的产品。试样的碱性熔融，以及熔融物在硝酸中的溶解。用4-甲基戊烷-2-酮萃取分离硫氰酸盐形式的锌。用盐酸水溶液重新萃取锌。在酒石酸、硫代硫酸钠和1-亚硝基-2-萘酚-3,6-du存在下，在pH 7,5下形成泛锌络合物

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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