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螯合滴定法分析铸铝合金中的锌,由于大量铝的干扰,通常要进行锌与铝的分离。本文利用铝和锌为两性金属,均能溶解于强碱溶液中的特点,将试样用氢氧化钠和硫酸肼溶解成溶液,加入掩蔽剂和铝阻溶剂后,可消除铝及其它元素的干扰,在PH为10±0.5的碱性溶液中,以铬黑T作指示剂,EDTA标准溶液为螯合剂,直接滴定锌。方法简便、快速、准确,可测定含锌量4％以上的铝合金。
Chelation titration analysis of zinc in cast aluminum alloys, due to the interference of large amounts of aluminum, usually zinc and aluminum separation. In this paper, aluminum and zinc are amphoteric metals, can be dissolved in a strong alkaline solution, the sample with sodium hydroxide and hydrazine sulfate dissolved into a solution, adding masking agent and aluminum solvent, the elimination of aluminum and other elements Interference, in the PH 10 ± 0.5 alkaline solution, chrome black T as an indicator, EDTA standard solution as a chelating agent, direct titration of zinc. The method is simple, rapid and accurate, and can measure the aluminum alloy containing more than 4% zinc.