碳纳米管对敌敌畏和甲胺磷的富集与检测

利用多壁碳纳米管作为固相萃取剂，对一定浓度的有机磷农药水溶液进行富集，然后用洗脱剂对富集后的碳纳米管进行洗脱，使用气相色谱仪测定洗脱液中有机磷农药的含量并计算回收率．在室温条件下，确定最佳的富集时间；使用乙酸乙酯作为洗脱剂，在中性条件下研究了洗脱温度、时间等条件的影响，确定了较高回收率的洗脱条件．结果表明：在室温下，碳纳米管对敌敌畏的富集在3h时达到100％．碳纳米管对甲胺磷的富集效果不佳．在中性条件下，60℃洗脱3h，敌敌畏的回收率为75．9％，碳纳米管可以用于实际水样中敌敌畏的富集与检测．

Enrichment and Detection of Dichlorvos and Methamidophos on Carbon Nanotubes

Multi-walled carbon nanotubes were used as solid phase extraction materials. Organophosphorus pesticide aqueous solution in a given concentration was enriched by carbon nanotubes and then eluted with eluant. The content of organophosphorus pesticide in the eluent was evalutated with gas chromatograph and calculates recovery. At room temperature, the best enrichment condition was determined according to the enrichment time. By using ethyl acetate as eluent, elution conditions for higher recovery were determined according to the eluting temperture and time under neutral conditions. The results showed that carbon nanotubes for dichlorvos enrichment approached 100% in weight after 3 hours, but only had limited influence on the enrichment of methamidophos. Under neutral conditions of 60 ℃ and elution for 3 hours, dichlorvos recovery rate reached 75.9%. Therefore, carbon nanotubes can be used for dichlorvos extraction and analysis in actual water samples.