离子选择电极法测定生活饮用水中氟化物

Determination of Fluoride in Drinking Water by Ion Selective Electrode Method

采用离子选择电极法对生活饮用水中氟化物浓度进行了测定。讨论了水样中pH值、温度、响应时间对测定结果的影响。在最佳条件下，方法的线性范围为0．10～3．0mg／L，相关系数为0．9999，检出限为0．05mg／L，实际水样加标回收率为97％～106％，相对标准偏差（n=5）为0．04％～0．65％。方法简单快速，干扰小，重现性好，加标回收率令人满意，能进行生活饮用水中氟化物浓度的有效测定。

A potentiometric method using a ion selective electrode was established for determination of fluoride in drinking water. The effects of pH, temperature, and response time on the measurement were discussed. Under the optimum conditions, the calibration curve has good linearity in the range of 0.10 to 3.0 mg/L with a correlation coefficient of 0. 999 9. The limit of detection was 0.05 mg/L. The recoveries of real water samples were 97% - 106% with the relative standard deviation of 0.04% -0. 65% （n= 5）. The proposed method has simplicity, rapidity, small interference, satisfactory recovery, and good reproducibility, suggesting that it can be successfully applied for the determination of fluoride in drinking water.