Department of Hydrogeology and Analytical Chemistry, University of Almeria, 04120 La Cañada de San Urbano, Almeria, Spain.
J Chromatogr A. 2011 Jul 29;1218(30):4790-8. doi: 10.1016/j.chroma.2011.02.044. Epub 2011 Feb 26.
A multiresidue method was developed for the quantification and confirmation of 70 pesticides in paddy field water. After its filtration, water was injected directly in a liquid chromatograph coupled to a hybrid triple quadrupole-linear ion trap-mass spectrometer (QqLIT). The list of target analytes included organophosphates, phenylureas, sulfonylureas, carbamates, conazoles, imidazolinones and others compounds widely used in different countries where rice is cropped. Detection and quantification limits achieved were in the range from 0.4 to 80 ng L(-1) and from 2 to 150 ng L(-1), respectively. Correlation coefficients for the calibration curves in the range 0.1-50 μg L(-1) were higher than 0.99 except for diazinon (0.1-25 μg L(-1)). Only 9 pesticides presented more than 20% of signal suppression/enhancement, no matrix effect was observed in the studied conditions for the rest of the target pesticides. The method developed was used to investigate the occurrence of pesticides in 59 water samples collected in paddy fields located in Spain and Uruguay. The study shows the presence of bensulfuron methyl, tricyclazole, carbendazim, imidacloprid, tebuconazole and quinclorac in a concentration range from 0.08 to 7.20 μg L(-1).
建立了一种多残留方法，用于定量和确证稻田水中的 70 种农药。水样经过过滤后，直接注入液相色谱-混合三重四极杆-线性离子阱-质谱联用仪（QqLIT）进行分析。目标分析物包括在水稻种植国家广泛使用的有机磷、苯脲、磺酰脲、氨基甲酸酯、苯并咪唑、咪唑啉酮和其他化合物。检测限和定量限分别为 0.4-80ng/L 和 2-150ng/L。在 0.1-50μg/L 范围内，校准曲线的相关系数均高于 0.99，除了敌百虫（0.1-25μg/L）外。只有 9 种农药的信号抑制/增强超过 20%，在研究的条件下，其余目标农药均未观察到基质效应。所建立的方法用于调查西班牙和乌拉圭稻田采集的 59 个水样中农药的存在情况。研究表明，在 0.08-7.20μg/L 的浓度范围内存在甲磺隆甲酯、三环唑、多菌灵、吡虫啉、戊唑醇和喹禾灵。
