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间羧基偶氮氯膦(简称CPA—mk)曾用于钢中铈族稀土的测定。本文研究了试剂与钪形成有色络合物的条件。在0.12～0.48mol/L盐酸介质中,于610和660nm处有两个吸收峰,摩尔吸光系数为4.0×10~4,Sc:CPA-mk为1:2,25毫升中0～10微克Sc_2O_3符合比尔定律。室温28°以下可稳定24小时。比偶氮氯膦mA法灵敏度高,稳定性好。用PMBP萃取分离干扰元素后,可测定矿石和岩石中1×10~(-4)～0.1％Sc_2O_3的含量。
Carboxylazo chlorophosphonazoles (CPA-mk for short) have been used for the determination of cerium rare earths in steel. In this paper, the conditions for the formation of colored complex with scandium have been studied. In 0.12 ~ 0.48mol / L hydrochloric acid medium, there are two absorption peaks at 610 and 660nm, the molar absorptivity is 4.0 × 10 ~ 4, Sc: CPA-mk is 1: 2,25 ml in 0 ~ 10 μg Sc_2O_3 In line with Bill’s law. Room temperature below 28 ° for 24 hours. Than the chlorophosphonazo mA method high sensitivity, good stability. The content of 1 × 10 ~ (-4) ~ 0.1% Sc_2O_3 in ore and rock can be determined by PMBP extraction and separation of interfering elements.