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本文应用武汉大学研制的新型显色剂-对乙酰基偶氮胂,针对江西稀土矿的特点,采用酸浸溶样,草酸掩蔽重稀土及铁、铝等共存元素,双波长法直接测定稀土矿中的轻稀土,而不进行分离,经与碱熔-萃取-偶氮氯膦Ⅲ法和偶氮胂Ⅲ法对照,结果良好。采用回归分析法处理数据,相关系数γ=0.9994。一、实验部分 1.主要仪器及试剂:721型分光光度计;0.1％对乙酰基偶氮肿水溶液;pH2.24盐酸-醋酸钠缓冲液;0.2％草酸溶液;轻稀土标准溶液:10μg/ml,以氧化物计,其中La:
In this paper, a new color reagent developed by Wuhan University - acetylarsenazo arsenic, for the characteristics of Jiangxi rare earth ore, acid leaching samples, oxalic acid concealment of heavy rare earth and iron, aluminum and other coexisting elements, dual wavelength method for the determination of rare earth ore In the light of rare earth, without separation, by alkali fusion - extraction - chlorophosphonazo Ⅲ method and arsenazo Ⅲ method control, the result is good. Regression analysis of data processing, correlation coefficient γ = 0.9994. First, the experimental part 1. The main instruments and reagents: 721 spectrophotometer; 0.1% azoacid solution; pH2.24 hydrochloric acid - sodium acetate buffer; 0.2% oxalic acid solution; light rare earth standard solution: 10μg / ml , Calculated as oxide, where La: