【摘要】 目的 探讨并改进催化还原分光光度法测定水中碘化物（I-）的操作步骤与实验条件。方法 室温条件代替水浴恒温;“三管法”预测样品中碘化物含量以选择相应的标准系列（1～10μg/L或10～100μg/ L）;目视观测高铈离子（Ce4+）减色程度以确定催化还原反应的终止时间;logE0/Ei（E0-空白管吸光度,Ei-标准管吸光度）直线回归方程替代吸光度非线性标准曲线图。结果 分析质量控制（AQC）盲样与分析质量控制机构反馈的该样品含量真值[（4.00±0.20）μg/L]高度符合。以logE0/Ei计算标准系列回归方程,y=0.062x+0.018,r=0.999,呈直线相关。结论 改进后的方法在仪器设备和操作步骤上得以简化,适用于普通实验室。更多还原

【Abstract】 ve To explore and improve the procedures of operation and experimental conditions of deter-mination of iodide in drinking water by catalytic reducing spectrophotometry. Methods The improved assay was carried out at room temperature instead of constant temperature water bath. The standard solution series [1~10μg/L or 10-100μg/L iodine(I-) ] were selected based on the contents of iodide in water samples estimated by "three-tube method" . The duration of catalytic reducing reaction was defined based on the decolorant intensity of Ce4+ observed by visual method. The linear regression equation of Ig E0/Ef ; (Eo: blank absorbance; Ei : standard absorbance) was used to replace the nonlinear standard curve of absorbance. Results The contents of iodide in blind water sample of analytical quality control determined by this method highly accorded with its ture value [(4.00±0.20)mg/L]provided by institution of analytical quality control. The linear regression equation of standard solution series was calculated by lg E0/Ei as y = 0.062x + 0.018(r = 0.999) . Conclusion The improved assay simplifying analytical instruments and operations was suitable for determination of iodide in drinking water in common laboratories.更多还原