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本文研究了水中稀土的测定条件,用PMBP-醋酸丁酯在pH5.5时萃取分离稀土元素,继以0.1NHCl-0.03％8-羟基喹啉溶液反萃取稀土元素,用三溴偶氮胂双波长分光光度法测定,以试剂吸收峰波长525nm为参比波长,络合物吸收峰波长650nm为测量波长,可将灵敏度提高65％左右。本文对双波长法提高灵敏度的原因进行了新的理论解释。一、实验部分 (一)仪器和主要试剂: 1.721型分光光度计、pHS-2型酸度计。 2.稀土标准溶液:La_2O_3:CeO_2:Nd_2O_3:Y_2O_3=30:40:20:10.贮备液1mg/ml,使
In this paper, the determination of rare earth in water conditions, with PMBP-butyl acetate extraction and separation of rare earth elements at pH5.5, followed by 0.1NHCl-0.03% 8-hydroxyquinoline solution stripping rare earth elements, with tribromoarsenazo bis Wavelength spectrophotometric determination of the reagent absorption peak wavelength of 525nm as the reference wavelength, the complex absorption peak wavelength of 650nm for the measurement wavelength, the sensitivity can be increased about 65%. In this paper, a new theoretical explanation is given for the reasons why the dual wavelength method enhances the sensitivity. First, the experimental part (A) of the instrument and the main reagents: 1.721 spectrophotometer, pHS-2-type pH meter. 2. Rare earth standard solution: La_2O_3: CeO_2: Nd_2O_3: Y_2O_3 = 30: 40: 20: 10. The stock solution 1mg / ml, so that