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    气相色谱-质谱法测定饮用水源中的痕量酚类物质

    Determination of Trace Phenols in Sources of Drinking Water by GC-MS

    • 摘要: 采用PSD小柱固相萃取-气相色谱-质谱法同时测定饮用水源中的8种痕量酚类污染物。水样中加入替代物溶液后,采用PSD固相萃取小柱富集待测物,以乙酸乙酯进行洗脱。洗脱液经氮气吹至近干后,用丙酮-正己烷(4+96)溶液定容。待测物在DM-35MS毛细管色谱柱上分离,质谱分析中选择电子轰击离子源和选择离子监测模式。8种酚类物质的质量浓度在2.0~1 000 μg·L-1范围内与其峰面积呈线性关系,检出限(3S/N)在0.43~1.03 μg·L-1之间。加标回收率在85.8%~96.7%之间,测定值的相对标准偏差(n=6)小于5.0%。实际水样分析发现,饮用水源中的苯酚残留量最大,为酚类污染物的代表物质。

       

      Abstract: GC-MS combined with solid phase extraction (SPE) by PSD column was developed for simultaneous determination of 8 trace phenols in sources of drinking water. The sample was mixed with substitute solution, and the analytes was extracted and enriched from the solution by a PSD SPE column with ethylacetate as eluant. The eluent was dried by nitrogen blowing and the analytes were resolved in a mixture of acetone and hexane. DM-35MS capillary column was selected to separate the phenols. EI and SIM were adopted in MS analysis. Linear relationships were found between the peak areas and the mass concentrations of 8 phenols in the range of 2.0-1 000 μg·L-1, with detection limits (3S/N) in the range of 0.43-1.03 μg·L-1. Recovery rates obtained by standard addition method were in the range of 85.8%-96.7% and RSDs (n=6) were less than 5.0%. Results of sample analysis showed that phenol was the largest residue in the source of drinking water.

       

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