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目的:改进2007年7月1日实施的《生活饮用水标准检验方法-消毒剂指标》中的3种二氧化氯检测方法,并评价改进后现场应用效果。方法:比较方法改进前后的精密度、稳定性及最低检出限,用3种改进后的方法对饮用水水样检测。结果:方法改进后精密度和准确性均提高,DPD法和碘量法的最低检出限降低,3种方法改进后加标回收率为80.00%~104.80%,对水样的检测结果较一致。结论:方法改进有意义,改进后3种方法均可满足饮用水中出厂水的检测需求。
OBJECTIVE: To improve the detection method of 3 chlorine dioxide in “Standard Test Method for Drinking Water - Disinfectant Index” implemented on July 1, 2007 and to evaluate the improved field application effect. Methods: The precision, stability and minimum detection limit before and after the method improvement were compared. Three improved methods were used to test drinking water samples. Results: The precision and accuracy of the improved method were all improved. The lowest detection limits of DPD method and iodometric method were reduced. The recoveries of the three methods were 80.00% ~ 104.80%, which were consistent with the results of water samples . Conclusion: The improvement of methods is significant. After the improvement, all the three methods can meet the detection needs of the factory water in drinking water.