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采用Hg_2Cl_2/HgS离子选择电极和217型饱和甘汞电极,对高纯水中微量Cl~(-1)的测定进行了实验。实验结果表明:电池的电极电位与溶液中Cl~(-1)浓度成线性关系。氯离子浓度在0—125微克/升范围内。浓度和电极电位之间的相关系数是0.9996。通过减少环境对样品溶液的污染,不仅降低了空白,而且提高了测定的灵敏度。 在给定的条件下,所用电极的测定下限是10微克/升,上限是110微克/升;校正曲线的斜率是3毫伏/10微克/升;浓度为10、20、50、80和100微克/升时,标准偏差分别为±1.6、±1.9、±4.1、±3.2和±1.6微克/升。
Hg_2Cl_2 / HgS ion selective electrode and 217 saturated calomel electrode were used to determine trace Cl ~ (-1) in high purity water. The experimental results show that the electrode potential of the battery has a linear relationship with the concentration of Cl ~ (-1) in the solution. Chloride concentration is in the range of 0-125 μg / L. The correlation between concentration and electrode potential was 0.9996. By reducing the environmental contamination of the sample solution, not only reduces the blank, but also increase the sensitivity of the assay. Under the given conditions, the lower limit of determination of the electrode used was 10 μg / L, the upper limit was 110 μg / L; the slope of the calibration curve was 3 mV / 10 μg / L; the concentrations were 10, 20, 50, 80 and 100 The standard deviation was ± 1.6, ± 1.9, ± 4.1, ± 3.2 and ± 1.6 μg / l at micrograms / liter, respectively.