| Abstract: | Gas chromatography with isotope dilution mass spectrometry (GC-MS) and enzyme-linked immunosorbent assay (ELISA) were used in regional National Water Quality Assessment studies of the herbicides, 2,4-D and dicamba, in river water across the United States. The GC-MS method involved solid-phase extraction, derivatized with deutemted 2,4-D, and analysis by selected ion monitoring. The ELISA method was applied after preconcentration with solid-phase extraction. The ELISA method was unreliable because of interference from humic substances that were also isolated by solid-phase extraction. Therefore, GC-MS was used to analyzed 80 samples from river water from 14 basins. The frequency of detection of dicamba (28%) was higher than that for 2,4-D (16%). Concentrations were higher for dicamba than for 2,4-D, ranging from less than the detection limit (<0.05 ??g/L) to 3.77 ??g/L, in spite of 5 times more annual use of 2,4-D as compared to dicamba. These results suggest that 2,4-D degrades more rapidly in the environment than dicamba. |
| Genre: | Article |
| ProdID: | 70023593 |
| Citation Author: | Thurman, E. M.; Zimmerman, L. R.; Aga, D. S.; Gilliom, R. J. |
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| Citation End Page: | 198 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | International Journal of Environmental Analytical Chemistry |
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| Citation Number Of Pages: | 14 |
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| Citation Search Results Text: | Regional water-quality analysis of 2,4-D and dicamba in river water using gas chromatography-isotope dilution mass spectrometry; 2001; Article; Journal; International Journal of Environmental Analytical Chemistry; Thurman, E. M.; Zimmerman, L. R.; Aga, D. S.; Gilliom, R. J. |
| Citation Start Page: | 185 |
| Citation Volume: | 79 |
| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Regional water-quality analysis of 2,4-D and dicamba in river water using gas chromatography-isotope dilution mass spectrometry; 2001; Article; Journal; International Journal of Environmental Analytical Chemistry; Thurman, E. M.; Zimmerman, L. R.; Aga, D. S.; Gilliom, R. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 2001 00:00 -0600 |
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