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实验证明,在测Si条件下,CV-SiMo、CV-PMo和CV-AsMo的吸光度具加和性。据此拟定了在非离子表面活性剂存在下,于水相测定痕量Si、P和As的分光光度法,测Si、P和As的表观摩尔吸光系数分别为1.45×10~5、1.70×10~5和1.69×10~5l·mol~(-1)·cm~(-1)。方法用于水、合金等样品的测定,结果令人满意。在此基础上,进一步讨论了离子缔合物CV-SiMo的组成比对酸度的依赖关系,不同杂多酸生成酸度间的差异及利用;进一步明确指出:离子缔合物的光度性质和摩尔吸光系数依赖于碱性染料的光度性质和摩尔吸光系数。
Experiments show that under the conditions of measuring Si, CV-SiMo, CV-PMo and CV-AsMo absorbance with additive. Based on this, the spectrophotometric method for the determination of trace Si, P and As in aqueous solution in the presence of nonionic surfactants was developed. The apparent molar absorptivities of Si, P and As were 1.45 × 10 ~ 5 and 1.70 × 10 ~ 5 and 1.69 × 10 ~ 5l · mol ~ (-1) · cm ~ (-1) respectively. The method is applied to the determination of water, alloy and other samples with satisfactory results. On this basis, we further discussed the dependence of the composition ratio of the ion-association compound CV-SiMo on the acidity, the differences and utilization of the acidity of the different heteropoly acids, and further pointed out that the photometric properties and the molar absorptivity The coefficient depends on the photometric properties of the basic dye and the molar extinction coefficient.