化学学报 ›› 1983, Vol. 41 ›› Issue (8): 709-714. 上一篇    下一篇

研究论文

分光光度法同时测定两个干扰组份的研究 I.多波长数据线性回归法及其应用于同时测定微量锰和锌的探讨

王保宁;李占双   

  1. 中国科学院长春应用化学研究所
  • 发布日期:1983-08-15

Investigations on simultaneous spectrophotometric determination of two-interfering-component systems i. The linear regression method of multi-wavelength data and study on application to the simultaneous determination of microamounts of manganese and zinc

WANG BAONING;LI ZHANSHUANG   

  • Published:1983-08-15

关键词: 分光光度法, 锌, 计算, 锰, 回归分析, 线性回归

In this paper, a linear regression method of multiwavelength data is proposed. The method, based on the difference of molar absorptivity between two coloured chelates at murti-wavelengths, can be applied to simultaneous spectrophotometric determination of two-interfering-component systems in the visible region. As an example, the availability as well as the optimum condition for simultaneous determination of Mn and Zn with 5-Br-PADAP in the presence of nonionic surfactant Triton X-100 have been studied. Measure the absorbance at 15 wavelengths over the range of 540-584 nm and treat the data with the suggested method, the linear correlation coefficients (γ) are found to be 0.998 in the synthetic mixtures containing microamounts of Mn and Zn with the concentration ratio from 1:10 to 10:1. The recoveries of both elements are 95-120% with the relative standard deviations (N=5) less than 17%. the method has been successfully used for direct determination of Mn and Zn in tap water. The new method proposed in this work is simple, fast and can be used for the analysis of two-interfering-component systems.

Key words: SPECTROPHOTOMETRY, ZINC, CALCULATION, MANGANESE, REGRESSION ANALYSIS, LINEAR REGRESSION

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