Engebretson J, Hall G, Hengel M, Shibamoto T
Department of Environmental Toxicology, University of California at Davis, One Shields Avenue, Davis, California 95616, USA.
J Agric Food Chem. 2001 May;49(5):2198-206. doi: 10.1021/jf010048b.
Pendimethalin [N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine], in the formulation of Prowl (a commercial herbicide), was applied to various crops. Analysis of pendimethalin and its metabolite [4(1-ethylpropyl)amino-2-methyl-3,5-dinitrobenzyl alcohol] was accomplished by utilizing liquid-liquid partitioning, gel permeation chromatography (GPC) for nuts and mint, solid-phase extraction (SPE) cleanup, and gas chromatography (GC) with a nitrogen--phosphorus detector (NPD). Method validation recoveries for fruits, nuts, vegetables, grass, and mint are given for both compounds. Pendimethalin average recoveries ranged from 71% to 126% over two levels of fortification. Pendimethalin metabolite average recoveries ranged from 69% to 123% over two levels of fortification. The quantitation limit for all crops except mint was 0.050 ppm. The quantitation limit for mint and mint oil was 0.10 ppm. Residues greater than the limit of quantitation were found for pendimethalin in apple pomace, fresh and dry fig, grass screenings, mint oil, almond hulls, green onion, and tomato pomace (wet and dry). Residues greater than the limit of quantitation were found for pendimethalin metabolite in grass screenings, grass straw, and almond hulls. All other crop analyses for pendimethalin and its metabolite were below the limit of quantitation.
二甲戊灵[N-(1-乙基丙基)-3,4-二甲基-2,6-二硝基苯胺]以“普乐宝”（一种商用除草剂）制剂形式施用于各种作物。通过液-液分配、针对坚果和薄荷的凝胶渗透色谱法（GPC）、固相萃取（SPE）净化以及配备氮磷检测器（NPD）的气相色谱法（GC）对二甲戊灵及其代谢物[4-(1-乙基丙基)氨基-2-甲基-3,5-二硝基苄醇]进行分析。给出了两种化合物在水果、坚果、蔬菜、草和薄荷中的方法验证回收率。二甲戊灵在两个加标水平下的平均回收率在71%至126%之间。二甲戊灵代谢物在两个加标水平下的平均回收率在69%至123%之间。除薄荷外，所有作物的定量限为0.050 ppm。薄荷和薄荷油的定量限为0.10 ppm。在苹果渣、新鲜和干无花果、草屑、薄荷油、杏仁壳、青葱以及番茄渣（湿和干）中发现二甲戊灵残留量高于定量限。在草屑、稻草和杏仁壳中发现二甲戊灵代谢物残留量高于定量限。二甲戊灵及其代谢物的所有其他作物分析结果均低于定量限。
