固相萃取—气相色谱—质谱法测定饮用水中百菌清含量不确定度评定

杨欢春; 魏秋宁; 安晶晶; 朱铭洪

doi:10.13421/j.cnki.hjwsxzz.2020.03.014

固相萃取—气相色谱—质谱法测定饮用水中百菌清含量不确定度评定

Uncertainty of Determination of Chlorothalonil in Drinking Water by SPE-GC-MS

摘要

摘要:
目的对固相萃取—气相色谱—质谱法测定水中百菌清含量的不确定度进行评定。
方法依据《测量不确定度评定与表示》（JJF 1059.1-2012），建立生活饮用水中百菌清测定的数学模型，分析和识别不确定度来源。运用不确定度传播律对生活饮用水中百菌清固相萃取—气相色谱—质谱法进行不确定度评定。
结果饮用水中百菌清的测量不确定度的主要来源依次是回收率、测量重复性以及线性回归产生的不确定度，分别为2.00%、1.97%和1.50%。按数学模型计算水样中百菌清含量的扩展不确定度为0.06 μg/L，校正后检测结果为（0.8±0.06）μg/L。
结论该方法适用于固相萃取—气相色谱—质谱法测定水中百菌清含量的不确定度评定，为水中半挥发性有机物分析过程的不确定度评定提供了一定参考。

Abstract:
Objectives To evaluate the uncertainty of determination of chlorothalonil in water by solid phase extraction-gas chromatography-mass spectrometry (SPE-GC-MS).
Methods Build mathematical model of chlorothalonil in drinking water to analyze and identify the source of uncertainty by JJF1059.1-2012 Evaluation and Expression of Uncertainty in Measurement. The uncertainty of chlorothalonil in drinking water determined by solid phase extraction-gas chromatography-mass spectrometry was assessed using law of propagation of uncertainty.
Results The study showed that the rate of recovery (2.00%), repeated measurements (1.97%) and linear regression(1.50%)were key factors influencing the reliability of result from determination of chlorothalonil in water. The expanded uncertainty of chlorothalonil in water was 0.06 μg/L according to mathematical model established in the present study. After correction, the test result was(0.8±0.06) μg/L.
Conclusions This method was applicable for the uncertainty evaluation of determination of chlorothalonil in water. It provided an important reference for the uncertainty evaluation for the semi volatile organic compounds determination in water.

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