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目的比较两种水中余氯测定方法的特点,以便合理选择与应用。方法分别采用方法 1和方法 2,测定生活饮用水中余氯量,以比较此两种方法的特点。结果方法 1检测结果得到回归方程Y=0.197X+0.00197,相关系数(r)=0.999;平均回收率为99%～101%,RSD分别为3.72%和1.46%;最低检测浓度为0.01 mg/L。方法 2检测结果达到回归方程Y=0.119X-0.00198,相关系数(r)=0.999;平均回收率为95.6%～101%,RSD为1.31%～3.71%;最低检出限为0.03 mg/L。结论以国家标准GB/T 5750.11-2006推荐的方法(即方法 1)综合优点更多一些,且在实际工作中更加易于掌握。
Objective To compare the characteristics of two methods for the determination of residual chlorine in water so as to reasonably choose and apply them. Methods Methods 1 and 2 were used to determine the amount of residual chlorine in drinking water to compare the characteristics of these two methods. The results showed that the regression equation was 0.197X + 0.00197, the correlation coefficient (r) was 0.999, the average recovery was 99% ~ 101% and the RSD was 3.72% and 1.46% respectively. The lowest detection limit was 0.01 mg / L . The results of method 2 reached the regression equation Y = 0.119X-0.00198, the correlation coefficient (r) = 0.999; the average recoveries ranged from 95.6% to 101% and the RSDs ranged from 1.31% to 3.71%. The lowest detection limit was 0.03 mg / L. Conclusion The method recommended by the national standard GB / T 5750.11-2006 (ie, Method 1) has more comprehensive advantages and is easier to grasp in practical work.