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本文报导,笔者在试验中发现,在pH=0.7的硝酸介质中,铋与偶氮氯膦Ⅲ(简称CPAⅢ)生成紫色络合物(λmax=685nm)。并且系统地研究了络合物的生成条件及其在测定中的应用,试验表明,铋与CPAⅢ生成的紫色络合物在乙醇溶液的增敏作用下,具有较高的灵敏度,摩尔吸光系数高达8.4×10~4以上,在方法的选择性方面,选用抗坏血酸和乳酸作掩蔽剂,除RE总量外(即稀土元素有部分干扰),绝大部分
This article reports that the author found in the experiment, bismuth and chlorophosphonazo Ⅲ (referred to as CPA Ⅲ) purple complex (λmax = 685nm) in pH = 0.7 nitric acid medium. The formation conditions of the complex and its application in the determination were systematically studied. The experimental results show that the purple complex formed by bismuth and CPA Ⅲ has higher sensitivity under the sensitization of ethanol solution and the molar absorption coefficient is as high as 8.4 × 10 ~ 4, in the method of selectivity, the choice of ascorbic acid and lactic acid as a masking agent, in addition to the total amount of RE (ie, rare earth elements have some interference), the vast majority