| Abstract: | From 1992 to 1994, 147 water samples were collected at 5 sites in the Tar-Pamlico drainage basin in North Carolina and analyzed for 46 herbicides, insecticides, and pesticide metabolites as part of the U.S. Geological Survey‘s National Water-Quality Assessment Program. Based on a common adjusted detection limit of 0.01 microgram per liter, the most frequently detected herbicides were metolachlor (84 percent), atrazine (78 percent), alachlor (72 percent), and prometon (57 percent). The insecticides detected most frequently were carbaryl (12 percent), carbofuran (7 percent), and diazinon (4 percent). Although the pesticides with the highest estimated uses generally were the compounds detected most frequently, there was not a strong correlation between estimated use and detection frequency. The development of statistical correlations between pesticide use and detection frequency was limited by the lack of information on pesticides commonly applied in urban and agricultural areas, such as prometon, chlorpyrifos, and diazinon, and the small number of basins included in this study. For example, prometon had the fourth highest detection frequency, but use information was not available. Nevertheless, the high detection frequency of prometon indicates that nonagricultural uses also contribute to pesticide levels in streams in the Tar-Pamlico drainage basin.
Concentrations of the herbicides atrazine, alachlor, and trifluralin varied seasonally, with elevated concentrations generally occurring in the spring, during and immediately following application periods, and in the summer. Seasonal concentration patterns were less evident for prometon, diazinon, and chlorpyrifos. Alachlor is the only pesticide detected in concentrations that exceeded current (2000) drinking-water standards. |
| Genre: | USGS Numbered Series |
| ProdID: | 45114 |
| Citation Author: | Woodside, Michael D.; Ruhl, Kelly E. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | vi, 20 p. : col. ill., col. maps ; 28 cm. |
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| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 2001-4067 |
| Citation Search Results Text: | Pesticides in streams in the Tar-Pamlico drainage basin, North Carolina, 1992-94; 2001; WRI; 2001-4067; Woodside, Michael D.; Ruhl, Kelly E. |
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| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Pesticides in streams in the Tar-Pamlico drainage basin, North Carolina, 1992-94; 2001; WRI; 2001-4067; Woodside, Michael D.; Ruhl, Kelly E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://nc.water.usgs.gov/reports/wri014067/ |
| Date Other: | Fri, 1 Nov 2002 00:00 -0600 |
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