地表水中硅酸盐两种测定分析方法的比对研究

Comparison of two methods for determination of silicate in surface water

应用硅钼蓝分光光度法和连续流动分析法测定地表水中硅酸盐,分别进行精密度和准确度试验。试验结果表明,相关系数均在0.999以上,方法检出限分别为0.015mg/L和0.012mg/L,分光光度法加标回收率为94.0~105%,RSD为0.6~2.1%;连续流动法加标回收率为93.5~108%,RSD为0.4~4.6%。使用t检验法对两种分析方法的结果进行差异化检验,结果表明二者无显著性差异。

The silicate in surface water was determined by silicon molybdenum blue spectrophotometry and continuous flow analysis. The precision and accuracy tests were carried out respectively. The results showed that their correlation coefficient were all over 0. 999, the detection limits were 0. 015 mg/L and 0. 012 mg/L,the relative recoveries were 94.0 %- 105 % and 93.5 %- 108 %, with RSD of 0.6 %- 2.1 and 0.4 %- 4.6 % （n = 6）, respectively. Compared with T-test, there was no significant different between them.