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期刊名称：JOURNAL AMERICAN WATER WORKS ASSOCIATION ISSN： 0003-150X 版本： SCI-CDE 出版频率： Monthly 出版社： AMER WATER WORKS ASSOC, 6666 W QUINCY AVE, DENVER, CO, 80235   出版社网址： http://www.awwa.org/ 期刊网址： http://ne.water.usgs.gov/html/Nawqa/pubs/abstracts/h2o_supply.htm 影响因子： 0.561(2008) 主题范畴： WATER RESOURCES;    ENGINEERING, CIVIL;     期刊简介(About the journal)    编辑部信息(Editorial Board)    About the journal   John K. Stamer Journal American Water Works Association, v. 88, no. 2, p. 76-85. The temporal distribution of the herbicides alachlor, atrazine, cyanazine, and metolachlor was documented from September 1991 through August 1992 in the Platte River at Louisville, Neb., the drainage of the Central Nebraska Basins. Lincoln, Omaha, and other municipalities withdraw groundwater for public supplies from the adjacent alluvium, which is hydraulically connected to the Platte River. Data were collected, in part, to provide information to managers, planners, and public utilities on the likelihood of water supplies being adversely affected by these herbicides. Three computational procedures- monthly means, monthly subsampling, and quarterly subsampling- were used to calculate annual mean herbicide concentrations. When the sampling was conducted quarterly rather than monthly, alachlor and atrazine concentrations were more likely to exceed their respective maximum contaminant levels (MCLs) of 2.0 礸/L and 3.0 礸/L, and cyanazine concentrations were more likely to exceed the health advisory level of 1.0 礸/L. The US Environmental Protection Agency has established a tentative MCL of 1.0 礸/L for cyanazine; data indicate that cyanazine is likely to exceed this level under most hydrologic conditions.   Editorial Board   U.S. Department of the Interior, U.S. Geological Survey Created and Maintained by: Nebraska Webmaster Team E-mail comments or questions to Ron Zelt, Central Nebraska Basins project chief