酸度对胶束配合物形成的影响及钨和锆的连续测定

Simultaneous Determination of Tungsten and Zirconium based on the Difference of the Micellar Complex Formimg Acidity

研究了钨和锆水杨基荧光酮及溴化十六烷基三甲基铵在不同酸度时形成三元胶束配合物的差异．在０．１０－０．３０ｍｏ１．Ｌ－１ＨＣｌ介质中，二者形成的胶束配合物吸收曲线严重重叠，且在一定浓度范围内吸光度加合性良好；酸度为０．９６－１．２０ｍｏ１·Ｌ－１ＨＣｌ时，钨配合物吸收曲线无变化，而锆配合物在原波长处基本无吸收．依据这种酸度差异建立了连续测定钨和锆的胶束增溶分光光度法．测定范围分别为２．０－８．０（Ｚｒ）μｇ／２５ｍＬ和４．０－１２．０μｇ（Ｗ）／２５ｍＬ．用本法测定了铝合金及模拟样品中钨和锆的含量，结果满意．

The difference of the trinary micellar complex forming acidity between tungsten/zirconium, Cetyltrimethylammonium bromide and Salicyl fluorone had been studied. In the medium of 0.10-0.30 mol·L -1 HCl, the absorption curves of the trinary micellar complexes of Tungsten and Zirconium are seriously overlapped, and a good additivity of their absorbances can be expected in a certain concentration range. When the HCl concentration is within 0.96-1.20 mol·L -1 , the absorbance of the tungsten micellar complex remains the same, but that of zirconium decreases remarkably, which can be neglected. The simultaneous determination of Tungsten and Zirconium based on the difference of the micellar complex forming acidity has been set up. Linear concentration rages are 2.0-8.0μg(Zr)/25mL and 4.0-12.0μg(W)/25mL, respectively. The contents of tungsten and zirconium in alloy and simulate samples have been determined with satisfactory results.