连续流动分析测定饮水中挥发酚的方法探讨

Determination of Volatile Phenols in Drinking Water by Continuous Flow Analysis

目的研究连续流动分析测定饮水中挥发酚的方法。方法通过绘制标准曲线、测定方法的检出限、准确度、精密度、有证标准物质、加标回收以及与国家标准方法(GB/T 5750.4-2006)进行比对。结果在0～50μg/L范围内线性关系良好,r=0.999 8;检出限0.072μg/L,检测限0.14μg/L;测定有证标准物质(GSBZ50003-88,批号:200345,46.9±3.6μg/L),结果在44.0μg/L～49.1μg/L之间,均值为47.6μg/L,再现性精密度RSD为3.1%(n=15);加标回收率在95%～103%之间;水样检测结果与国家标准方法比较,t=0.429<t(0.05,3)=3.182,P>0.05,差异无统计学意义。结论本法简便、快速、准确、样品用量少、检出限低,可满足日常监测大批量饮水样品中挥发酚的测定。

Objective To evaluate the method to determine volatile phenols in drinking water by using a Continuous Flow Analyzer(CFA). Methods A comparison to the method in national standard GB Method(GB/T 5750.4-2006)was made by plotting the standard curve, measuring the limit of detection, accuracy and precision, analyzing certified reference material(CRM) and carrying out spiked recovery test. Results The linearity was good in the range of 0-50 μg/L(r=0.999 8);LOD was 0.072 μg/L,LOQ was 0.14 μg/L;the analytical results of CRM(GSBZ50003-88 Batch:200345, 46.9 ± 3.6 μg/L) were between 44.0 and 49.1 μg/L, and the average was 47.6 μg/L;reproducibility RSD was 3.1%(n=15);spiked recoveries were beteween 95% and 103%. The difference from the national standard method was statistically insignificant(t=0.429<t(0.05,3)=3.182,P>0.05). Conclusion This method is simple, fast and accurate with a low sample demand and a low limit of detection. It can meet the need for daily monitoring of volatile phenols in drinking water.