Linked Life Data

12434220

Source:http://linkedlifedata.com/resource/pubmed/id/12434220

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2002-11-15
pubmed:abstractText
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.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0090-4341
pubmed:author
pubmed:issnType
Print
pubmed:volume
44
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
67-76
pubmed:dateRevised
2004-11-17
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Aqueous-phase disappearance of atrazine, metolachlor, and chlorpyrifos in laboratory aquaria and outdoor macrocosms.
pubmed:affiliation
U.S. Department of Agriculture, Natural Resources Conservation Service, Wetland Science Institute, 12311 Beech Forest Rd., Laurel, Maryland 20708, USA.
pubmed:publicationType
Journal Article