真空碳酸钾法脱硫废液中S_2O_3^(2-)和SCN-的测定

Determination of S_2O_3^(2-) and SCN-in the desulfurization waste water of vacuum potassium carbonate method

通过碘量法和分光光度法分别测定了脱硫废液中S2O2-3与SCN-的含量,并排除了实验中的干扰因素,S2O2-3、SCN-的质量浓度分别为15 989.1mg/L、7 543.0mg/L,误差分析后,S2O2-3的标准偏差为2.7~6.9,相对标准偏差为1.7%~2.3%,回收率为99.8%~100.2%;SCN-的标准偏差为4.06~11.68,相对标准偏差为5.4%~6.3%,回收率为99.5%~103.8%。

The content of S 2 O 3^2- and SCN-in the desulfurization waste water is determined by iodime-try and spectrophotometric method,and the interference factors are eliminated during experiment . The mass concentration of S 2 O3^2- and SCN-is 15 989.1mg/L and 7 543.0mg/L respectively.Error analysis shows that the standard deviation of SS2O3 ^2-is 2.7-6.9,relative standard deviation is 1.7%-2.3%, and recovery rate is 99.8%-100.2%;the standard deviation of SCN-is 4.06-11.68,rela-tive standard deviation is 5.4%-6.3%, and recovery rate is 99.5%-103.28%.