自制PEG-20M固相微萃取装置分离分析蔬菜中残留扑草净

Detection of Prometryne in Vegetable by Custom-made SPME Apparatus

利用溶胶-凝胶法制备出PEG-20M的固相微萃取头(SPME Head fiber),将自制的微萃取装置与气相色谱(GC)联用,用于蔬菜样品中残留扑草净的分析。固相微萃取条件主要讨论了萃取时间和搅拌条件的影响,解析条件主要考虑了解析温度、解析时间等因素,通过实验获得了优化的固相微萃取和SPME/GC的主要操作参数。以扑草净为分析对象,以自制的PEG-20M萃取装置分离富集蔬菜中残留扑草净,结果表明PEG-20M萃取头对三嗪类农药扑草净具有较好的分离富集作用。

Solid-phase microextraction （ SPME ） head was made of polyethylene glycol 20000 （ PEG- 20M） coating. The custom-made SPME setup was applied for analysis and detection of prometryne in vegetable combined with SPME/GC. Operating parameters in SPME and SPME/GC, such as extraction time, extraction temperature, stirring conditions and adsorption temperature, were discussed in detail. Optimized operation parameters were obtained. Separation and enrichment of prometryne in vegetables could be achieved with a PEG-20M SPME head combined with GC detection. The results showed that the PEG-20M SPME head was quite effective for separation and enrichment of triazine pesticides.