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利用过氧化氢氧化丽春红褪色,以Eu3+为催化剂,建立一种新的测定铕的动力学分光光度法。在6.0×10-2mol/L的盐酸介质中,Eu3+-H2O2-丽春红体系的最大吸收峰位于450nm,Eu3+量在0～22μg/25mL范围内与吸光度差值△A呈良好的线性关系,其回归方程为△A=0.0221C+0.0241(C=μg/25mL),相关系数r=0.9968,方法检出限为2.42μg/L。本方法用于水样中铕的测定,13次测定相对标准偏差为0.49%～1.76%,加标回收率为95.20%～101.3%。
The use of hydrogen peroxide oxidation Ponceau fading Eu3 + as a catalyst to establish a new kinetic spectrophotometry for the determination of europium. In 6.0 × 10-2mol / L hydrochloric acid medium, the maximum absorption peak of Eu3 + -H2O2-Li Chunhong system is at 450nm, and the range of 0 ~ 22μg / 25mL of Eu3 + shows a good linear relationship with the absorbance difference △ A, The regression equation was △ A = 0.0221C + 0.0241 (C = μg / 25mL), the correlation coefficient was 0.9968, and the detection limit was 2.42μg / L. The method was applied to the determination of europium in water samples. The relative standard deviations (RSDs) of 13 determinations were 0.49% ~ 1.76%, and the spiked recoveries were 95.20% ~ 101.3%.