| 工业污染场地土壤苯系物的检测方法比较研究 |
| 摘要点击 3059 全文点击 3093 投稿时间：2010-06-05 修订日期：2010-09-01 |
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| 中文关键词 污染场地 土壤 苯系物 静态顶空 吹扫捕集 |
| 英文关键词 contaminated site soil BTEX static headspace purge-and-trap |
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| 中文摘要 |
| 以工业污染场地为研究对象，比较和分析了静态顶空、吹扫捕集和固相微萃取等3种前处理方法对土壤中苯系物的气相色谱检测结果差异.结果表明，静态顶空和吹扫捕集两种方法均可对土壤苯系物进行定性定量分析，固相微萃取因土壤有机污染物对萃取探头造成溶解损害而不能检测.静态顶空法检测苯系物各组分的回收率为95.2%～98.2%，吹扫捕集法检测各组分的回收率为99.2%～101.3%.当土壤中苯系物总量较低时(均小于60 mg/kg)，吹扫捕集法检测结果比静态顶空法高12.6%～37.6%，而当土壤中苯系物浓度较高时，静态顶空法检测结果要远高于吹扫捕集法.静态顶空和吹扫捕集前处理样品的检测结果都显示，苯系物各组分与总量之间呈显著相关，其中苯、间对二甲苯和苯系物总量的相关趋势线接近，均可用二次函数很好地拟合. |
| 英文摘要 |
| In order to ascertain BTEX measurements of soils from industrial contaminated sites,static headspace,purge-and-trap and solid phase microextraction (SPME) combined gas chromatography were selected to determine BTEX in the soils.This method of SPME could not be used to analyze BTEX isomers in soils from highly contaminated sites because the high concentration of organic contaminants eroded the SPME probe head.The recoveries for added standard ranged from 95.2%-98.2% for static headspace-GC and 99.2%-101.3% for purge-and-trap-GC.When the soil samples contained low concentrations of BTEX (<60 mg/kg),the concentration determined by purge-and-trap-GC was 12.6%-37.6% higher than the value from static headspace-GC.For soil samples containing high concentrations of BTEX,the static headspace-GC result was higher than that from purge-and-trap-GC.The correlation trend lines of individual BTEX isomers to total BTEX were similar for both static headspace-GC and purge-and-trap-GC results. |
