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偶氮氯膦Ⅲ作为稀土元素的显色剂,人们已作了很多研究,而应用于其他元素的研究则较少。在试验中,我们发现该试剂对钙和铅的反应也很灵敏,对钙的研究已有报导,本文对偶氮氯膦Ⅲ作铅的显色剂进行了初步探讨。 在PH4.7～5.5时,偶氮氯膦Ⅲ和铅形成3:1的蓝色络合物,在620和670nm处有两个吸收峰,ε_(620)=2.85×10~4。试样经氢氧化钠分离后,用过量亚铁氰化钾掩蔽锌,可测定黄铜、青铜中的铅。
Chlorophosphonazo Ⅲ as a rare earth element developer, people have made a lot of research, and applied to other elements of the less. In the experiment, we found that the reagent is very sensitive to the reaction of calcium and lead, and the study of calcium has been reported. In this paper, chlorophosphonazo Ⅲ as the lead developer is discussed. At pH4.7 ~ 5.5, the chlorophosphonazo Ⅲ forms a 3: 1 blue complex with lead and has two absorption peaks at 620 and 670 nm with ε 620 (620) = 2.85 × 10 -4. After the sample is separated by sodium hydroxide, zinc is masked with an excess of potassium ferrocyanide to determine lead in brass and bronze.