依据H₂O₂优先和Zr⁴⁺络合的原理，以偶氮胂Ⅲ为显色剂，建立了La³⁺、Zr⁴⁺共存下La³⁺含量的分光光度测试方法。结果显示，在高质量浓度Zr⁴⁺存在下，以H₂O和H₂O₂的体积比为9：1的溶液为溶剂，可实现对Zr⁴⁺的掩蔽；在最佳实验条件下，La³⁺离子工作曲线方程式为：A=0.396 9c+0.039 54，相关系数R=0.999 1，线性范围为0.2~1.6 μg/mL，回收率在100%~101%之间。

On account of H₂O₂ preferentially complexing with Zr⁴⁺,a new spectrophotometric detection method is established to determine the content of La³⁺ accompanied by Zr⁴⁺.In this method,arsenazo Ⅲ is used as chromogenic reagent.The results reveal that Zr⁴⁺ is efficiently sheltered by using a solution that the volume ratio of H₂O and H₂O₂ is 9:1,with the presence of high concentration of Zr⁴⁺.Under the optimum experimental conditions,the working curve equation for lanthanum ions is A=0.396 9c+0.039 54(c:μg·mL^-1),with a correlation coefficient of 0.999 1.The relationship between concentration and absorption for lanthanum ions is linear in the range of 0.2-1.6 μg·mL^-1,and the recovery rate is between 100% and 101%.

吴彩云(1990-),女,硕士研究生,研究方向为固体电解质合成及其应用,1013983911@qq.com