偶氮氯磷-mN直接光度法测定矿石中铈族稀土元素

Direct Spectrophotometric Determination of Microamount of Cerium-Group Rare Earths in Minerals and Rocks with Chlorophosphonazo-mN

本文研究了偶氮氯膦-mN在磷酸—草酸—焦磷酸钠体系中以锌-EDTA二乙酯作缓冲掩蔽剂在钇族稀土和常见元素存在下,不经分离,直接测定铈族稀土元素的可能性。一、实验部分偶氮氯膦-mN:0.05%水溶液(上海师大)。Zn-EDTA二乙酯0.15%水溶液:称取EDTA二乙酯15克;乙酸锌15克溶于1000毫升水中,摇均。混合铈组稀土标准:用光谱纯的稀土氧化物按La∶Ce∶Pr∶Nd:Sm等于50∶30∶20∶10∶10配成每毫升含10微克的酸性稀土溶液(0.1N盐酸)。混合钇族稀土标准:按Y∶Ho∶Yb∶Lu等于66∶4∶18∶6配制成每毫升10微克的标准溶液(0.1N盐酸)。

This paper presents a direct rapid spectrophotometric method to determine the cerium-group rare earth elements in minerals and rocks with chlorophosphonazo-mN as a developing reagent.Oxalic acid,phosphoric acid and sodium pyrophosphate were used as masking agents for yttriums-group earths and Zn-EDTA-diethylester as masking agent for other foreign ions.