Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters
Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters
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DOI：
10.1021/es971138t
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发表时间：
1998-06-01
影响因子：
11.4
通讯作者：
Barcelo, D
中科院分区：
文献类型：
--
作者：
Kalkhoff, SJ;Kolpin, DW;Barcelo, D
从整个爱荷华州的88个市政威尔斯在夏季收集水样，并每月收集在东部爱荷华州的12个流站点从1996年3月至12月，研究乙草胺，甲草胺和异丙甲草胺的磺酸和草酰苯胺代谢物的发生。磺酸和草酰苯胺代谢物存在于近75%的地下水样品中，并且通常比其母体化合物的频率高3至45倍。在地下水中，乙草胺、甲草胺和异丙甲草胺的总浓度的中位值小于0.05微克/升，六种代谢物的总浓度的中位值为1.2微克/升。所有地表水样本都含有至少一种可检测的代谢物化合物。单个代谢产物的检出频率是母体化合物的2倍至100倍以上。在地表水中，三种母体化合物总浓度的中位值为0.13 μ g/L，六种代谢物总浓度的中位值为6.4 μ g/L。这些数据表明了分析母体化合物和代谢物的重要性，以更充分地了解除草剂在水文系统中的环境命运和运输。
Water samples were collected from 88 municipal wells throughout Iowa during the summer and were collected monthly at 12 stream sites in eastern Iowa from March to December 1996 to study the occurrence of the sulfonic and oxanilic metabolites of acetochlor, alachlor, and metolachlor. The sulfonic and oxanilic metabolites were present in almost 75% of the groundwater samples and were generally present from 3 to 45 times more frequently than their parent compounds. In groundwater, the median value of the summed concentrations of acetochlor, alachlor, and metolachlor was less than 0.05 mu g/L, and the median value of the summed concentrations of the six metabolites was 1.2 mu g/L. All surface water samples contained at least one detectable metabolite compound. Individual metabolites were detected from 2 to over 100 times more frequently than the parent compounds. In surface water, the median value of the summed concentrations of the three parent compounds was 0.13 mu g/L, and the median value of the summed concentrations of the six metabolites was 6.4 mu g/L. These data demonstrate the importance of analyzing both parent compounds and metabolites to more fully understand the environmental fate and transport of herbicides in the hydrologic system.