吹扫捕集-气相色谱-质谱法快速测定生活饮用水中82种挥发性有机物

王璐; 蔡德玲; 梁宁; 黄晶; 杨滨银

doi:10.13421/j.cnki.hjwsxzz.2024.06.009

吹扫捕集-气相色谱-质谱法快速测定生活饮用水中82种挥发性有机物

Rapid determination of 82 kinds of volatile organic compounds in drinking water by purge-trapping-GC-MS

摘要

摘要:
目的建立吹扫捕集-气相色谱-质谱联用(P&T-GC-MS)法测定生活饮用水中三氯甲烷、四氯化碳等82种挥发性有机物(volatile organic compounds, VOCs)的分析方法。
方法生活饮用水经吹扫捕集技术进行富集，经DB-624色谱柱分离，GC-MS选择扫描模式进行分析，以保留时间和特征离子定性，内标法定量。
结果 82种VOCs在1.0~20.0 μg/L浓度范围内的线性关系良好，R²均大于0.990(1, 1-二氯丙酮为0.988除外)，方法检出限为0.02~2.69 μg/L，定量限为0.07~8.95 μg/L，回收率72.3%~122.6%，相对标准偏差为0.29%~11.48%。应用该方法测定80份不同水样，结果检出8种痕量VOCs。
结论本方法灵敏、准确，操作简便，适用于生活饮用水中82种VOCs的同时检测。

Abstract:
Objective To develop a method for rapid determination of 82 kinds of volatile organic compounds (VOCs) including chloroform and carbon tetrachloride in drinking water by gas chromatography-mass spectrometry with the purge-traping technique (P&T-GC-MS).
Methods Drinking water was enriched by purge-traping technique, separated by DB-624 column, and then analyzed by GC-MS with scanning mode. Retention time and characteristic ions were adopted for qualitative analysis, and the internal standard method was conducted for quantitative analysis.
Results There were good linear relationships between 82 VOCs within 1.0-20.0 μg/L, with all R² values greater than 0.990 (except that the R² values for 1, 1-Dichloro-2-propanone was 0.988). The detection limit was 0.02-2.69 μg/L. The limit of quantification was 0.07-8.95 μg/L. The recovery rate was 72.3%-122.6%. The relative standard deviation was 0.29%-11.48%. The method was applied to determine 80 different water samples, and 8 trace VOCs were detected.
Conclusion The method is sensitive, accurate, and simple, and is suitable for simultaneous determination of 82 kinds of VOCs in drinking water.

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