在Triton X - 100存在下用肼达唑分光光度法测定锌及其在金属分析中的应用

Spectrophotometric determination of zinc with hydrazidazol in the presence of Triton X-100 and its application in metal analysis.

作者信息

Zhou N, Gu Y X, Lu Z R, Chen W Y

机构信息

Shanghai Research Institute of Materials, MMBI, Shanghai, People's Republic of China.

出版信息

Talanta. 1989 Jul;36(7):739-42. doi: 10.1016/0039-9140(89)80142-0.

DOI:10.1016/0039-9140(89)80142-0

PMID:18964796

Abstract

A new spectrophotometric method for the determination of zinc is proposed. The chromogenic agent Hydrazidazol forms a 1:1 chelate with zinc in the presence of Triton X-100 in a medium containing 20-40% ethanol. The molar absorptivity and conditional formation constant have been found to be 2.7 x 1O(4) l.mole(-1).cm(-1) (at 640 nm) and 10(5.32) respectively. Beer's law is obeyed for zinc over the range of 0.2-0.8 mug/ml with a standard deviation of 0.024 mug/ml. The method can be applied to the determination of zinc in cadmium metal and its oxide after preconcentration by selective extraction of zinc thiocyanate into ethyl acetate in the presence of EDTA and thiosulphate as masking agents.

摘要

提出了一种测定锌的新分光光度法。显色剂肼唑在含有20 - 40%乙醇的介质中，在Triton X - 100存在下与锌形成1:1螯合物。已发现摩尔吸光率和条件形成常数分别为2.7×10⁴ l·mol⁻¹·cm⁻¹（在640 nm处）和10⁵·³²。锌在0.2 - 0.8 μg/ml范围内符合比尔定律，标准偏差为0.024 μg/ml。该方法可应用于镉金属及其氧化物中锌的测定，测定前在EDTA和硫代硫酸盐作为掩蔽剂存在下，通过将硫氰酸锌选择性萃取到乙酸乙酯中进行预富集。