用对氯偶氮氯膦分光光度法同时测定铈与钇

Simultaneous Spectrophotometric Determination of Cerium and Yttrium with Chlorophosphonazo-p-Cl(CPApC)

本文提出了用对氯偶氮氯膦(CPApC)在0.2mol/L盐酸溶液中,于λ=678nm处测定铈与钇总量,而在同样酸度及草酸——焦磷酸钠联合掩蔽下测定铈量,由此可分别求得铈与钇的含量.测定铈与钇的表观摩尔吸光系数分别为:1.07×10~5,7.83×10~4.用此方法经过萃取分离后测定了镍基合金中的铈与钇,获得满意的结果.

A new method for simultaneous determination of Ce and Y with Chloropho-sphonazo-p-Cl has been developed.In the presence of ethanol, the total absorbances of Ce and Y complexes are measured at 678nm in 0.2mol/L hydrochloric acid solution, while the absorbance of Ce complex is measured at the same condition by masking Y with a mixture of oxalic acid and sodium pyrophosphate.The apparent molar absorptivities are found to be 1.07×10~5 for Ce and 7.83×10~4 for Y.The method has been used successfully for simultaneous determination of Ce and Y in nickel based alloys.