固相萃取-气相色谱法快速分析水中硝基苯类化合物

Fast Analysis of Nitrobenzene Compounds in Water by Solid Phase Extraction-Capillary Gas Chromatography

建立了固相萃取-气相色谱定量分析水中硝基苯类化合物的分析方法,详尽地叙述了水样预处理过程。对固相萃取,水样预处理和色谱分离条件做了试验并予以优化。采用ODS-C18固相萃取柱将样品浓缩富集后,以DB-17色谱柱(30 m×0.32 mm×0.25μm)为分离柱,以ECD和FID检测。方法检出限在0.12～90μg/L之间,低于GB13194-91和GB/T 13194-92的规定;加标回收率在81.3%～117%之间,相对标准偏差(n=6)于0.9%～5.8%之间,准确度和精密度符合相关质量控制要求。研究结果表明:该方法灵敏度高、选择性好,适用于水中硝基苯类化合物的分离分析。

A method for the determination of nitrobenzene compounds in water was established by solid phase extraction（SPE）-capillary gas chromatography.The pretreatment of water sample was studied.Conditions of pretreatment of water sample,solid phase extraction and separation by liquid chromatography were tested and optimized.Nitrobenzene in sample was enriched on ODS-C18 column,and separated on DB-17 column（30 m×0.32 mm×0.25 μm） with ECD and FID.The minimal detection concentration was between 0.12～90 μg/L,lower than those of GB13194-91 and GB/T13194-92.The recoveries of the compound were between 81.3% and 117%,relative standard deviation ranged from 0.9% to 5.8%,with accuracy and precision in accordance with the related quality control regulations.Results showed that the method which has advantages over high sensitivity,good selectivity was suitable for determining nitrobenzene compounds in water samples.