Rocha Cleonice, Pappas Elizabeth A, Huang Chi-hua
Catholic University of Goiás, Av. Universitária, 1440 S. Universitário, Cx, Brazil.
Environ Pollut. 2008 Mar;152(1):239-44. doi: 10.1016/j.envpol.2007.04.029. Epub 2007 Jul 13.
Solid-phase microextraction coupled with gas chromatography-mass spectrometry (SPME-GC-MS) was used to analyze two triazine (atrazine and simazine) and three chloroacetamide herbicides (acetochlor, alachlor, and metolachlor) in water samples from a midwest US agricultural drainage ditch for two growing seasons. The effects of salt concentration, sample volume, extraction time, and injection time on extraction efficiency using a 100-mum polydimethylsiloxane-coated fiber were investigated. By optimizing these parameters, ditch water detection limits of 0.5 microgL(-1) simazine and 0.25 microgL(-1) atrazine, acetochlor, alachlor, and metolachlor were achieved. The optimum salt concentration was found to be 83% NaCl, while sample volume (10 or 20 mL) negligibly affected analyte peak areas. The optimum extraction time was 40 min, and the optimum injection time was 15 min. Results indicated that atrazine levels in the ditch water exceeded the US maximum contaminant level for drinking water 12% of the time, and atrazine was the most frequently detected among studied analytes.
采用固相微萃取-气相色谱-质谱联用技术（SPME-GC-MS）对美国中西部一条农业排水沟两个生长季节的水样中的两种三嗪类（阿特拉津和西玛津）和三种氯乙酰胺类除草剂（乙草胺、甲草胺和异丙甲草胺）进行了分析。研究了盐浓度、样品体积、萃取时间和进样时间对使用100μm聚二甲基硅氧烷涂层纤维萃取效率的影响。通过优化这些参数，实现了对排水沟水中西玛津的检测限为0.5μg/L，阿特拉津、乙草胺、甲草胺和异丙甲草胺的检测限为0.25μg/L。发现最佳盐浓度为83%氯化钠，而样品体积（10或20mL）对分析物峰面积的影响可忽略不计。最佳萃取时间为40分钟，最佳进样时间为15分钟。结果表明，排水沟水中阿特拉津的含量有12%的时间超过了美国饮用水的最大污染物水平，并且在所研究的分析物中，阿特拉津是最常检测到的。
