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不少文献报导,在光度分析中,运用了水—有机介质,使某些显色反应的灵敏度和选择性得到提高,从而大大改善了光度分析的特性。 在水介质中锆与偶氮氯膦Ⅲ的显色反应及在溴化十六烷基三甲基铵存在下,锆与偶氮氯膦Ⅲ的显色反应已有所研究。 本文研究了在大量乙醇存在下,锆与偶氮氯膦Ⅲ的显色反应。实验结果表明,在2.1～2.7N盐酸酸度下,锆与偶氮氯膦Ⅲ形成1:3的络合物,其络合物的最大吸收在675nm,较之水相紫移15nm,摩尔吸光系数等于6.5×10~4,相当于水相的2～3倍,1～12Jg/25ml范围内从服比尔定律。并对共存离子干扰及掩蔽进行了试验,拟定了铝合金中酸溶性锆的测定方法。实践证明,此方法简便,快速,灵敏度高,选择性好。
It has been reported in many literatures that in the photometric analysis, the water-organic medium is used to improve the sensitivity and selectivity of certain color-forming reactions, thereby greatly improving the characteristics of photometric analysis. The chromogenic reaction of zirconium with chlorophosphonazo Ⅲ in aqueous medium and the chromogenic reaction of zirconium with chlorophosphonazo Ⅲ in the presence of cetyltrimethylammonium bromide have been studied. In this paper, the color reaction of zirconium with chlorophosphonazo Ⅲ in the presence of a large amount of ethanol was studied. The experimental results showed that the complex of zirconium and chlorophosphonazo Ⅲ formed 1: 3 under the acidity of 2.1 ~ 2.7N, the maximum absorption of the complex was 675nm, the molar extinction coefficient Equal to 6.5 × 10 ~ 4, equivalent to 2 to 3 times the aqueous phase, 1 ~ 12Jg / 25ml from the service Bill’s law. The coexisting ion interference and masking were tested, and the determination method of acid soluble zirconium in aluminum alloy was proposed. Practice has proved that this method is simple, fast, high sensitivity, good selectivity.