Abstract：
:Dissipation processes are described for a combination of commonly used pesticides-atrazine (6-chloro-4-ethylamino-6-isopropylamino- s-triazine), metolachlor (2-chloro- N-[2-ethyl-6-methyl-phenyl]- N-[2-methoxy-1-methylethyl] acetamide), and chlorpyrifos ( O-O diethyl O-[3,5,6-trichloro-2-pyridinyl] phosphorothioate)-in a laboratory and outdoor pond systems. Dosing rates and timing were designed to duplicate those common in the mid-Atlantic Coastal Plain, USA. Treatments ranged from 2 and 2.5 mg/L to 0.2 and 0.25 mg/L respectively for atrazine and metolachlor, and chlorpyrifos was added at 1.0 and 0.1 mg/L in the aquaria and at 0.1 mg/L in the outdoor macrocosms. Chlorpyrifos disappearance was rapid in all of the systems and followed a two-phase sequence. Initial half-lives varied from 0.16 day to 0.38 day and showed similar rates in the aquaria and the outdoor systems. The second phase of the chlorpyrifis loss pattern was slower (18-20 days) in all the treatments except for the low herbicide treatment in the outdoor test, where it was 3.4 days. Compared to the outdoor system, herbicide losses were much slower in the aquaria, e.g., 150 days for atrazine and 55 days for metolachlor, and no appreciable loss of herbicide was apparent in the high-treated aquaria. In the outdoor systems, the half-lives for the low herbicide treatment were 27 days and 12 days, respectively, for atrazine and metolachlor, and 48 and 20 days, respectively for the high herbicide-treated pond. Very low levels of CIAT (6-amino-2-chloro-4-iso-propylamino- s-triazine) and CEAT (2-chloro-4-ethylamino-6-ethylamino- s-triazine), degradation products of atrazine, were observed in the outdoor studies.
journal_name
Arch Environ Contam Toxicoljournal_title
Archives of environmental contamination and toxicologyauthors
Mazanti L,Rice C,Bialek K,Sparling D,Stevenson C,Johnson WE,Kangas P,Rheinstein Jdoi
10.1007/s00244-002-1259-3subject
Has Abstractpub_date
2003-01-01 00:00:00pages
67-76issue
1eissn
0090-4341issn
1432-0703journal_volume
44pub_type
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