| Abstract: | Alachlor and metolachlor are dechlorinated and transformed into their corresponding ethane sulfonic acid (ESA) metabolites in soil. In a field-disappearance study, it was shown that alachlor ESA was formed at a faster rate and at concentrations 2-4 times higher than metolachlor ESA, conforming with the observed longer disappearance half-life of metolachlor (15.5 d) in the field as compared to alachlor (8 d). Runoff data also showed higher concentrations of alachlor ESA as compared to metolachlor ESA, even though they were applied at the same levels. Data from soil cores showed transport of the ESA compounds in soil to as far down as 75-90 cm below the surface, at concentrations ranging from less than 0.5 ??g/L to about 50 ??g/L. In contrast, no parent herbicide was detected at these depths. This observation correlates with the higher log KOC values for alachlor (3.33) and metolachlor (3.01) relative to their corresponding ESA metabolites, alachlor ESA (2.26), and metolachlor ESA (2.29). |
| Genre: | Article |
| ProdID: | 70023461 |
| Citation Author: | Aga, D. S.; Thurman, E. M. |
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| Citation End Page: | 2460 |
| Citation Issue: | 12 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental Science and Technology |
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| Citation Number Of Pages: | 6 |
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| Citation Search Results Text: | Formation and transport of the sulfonic acid metabolites of alachlor and metolachlor in soil; 2001; Article; Journal; Environmental Science and Technology; Aga, D. S.; Thurman, E. M. |
| Citation Start Page: | 2455 |
| Citation Volume: | 35 |
| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Formation and transport of the sulfonic acid metabolites of alachlor and metolachlor in soil; 2001; Article; Journal; Environmental Science and Technology; Aga, D. S.; Thurman, E. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1021/es991264s |
| Date Other: | Mon, 1 Jan 2001 00:00 -0600 |
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