Pesticides in Mississippi air and rain: a comparison between 1995 and 2007
Environ Toxicol Chem. 2014 Jun;33(6):1283-93. doi: 10.1002/etc.2550. Epub 2014 Apr 4.
Pesticides in Mississippi air and rain: a comparison between 1995 and 2007.
Author information
- 1US Geological Survey, Sacramento, California.
Abstract
A
variety of current-use pesticides were determined in weekly composite
air and rain samples collected during the 1995 and 2007 growing seasons
in the Mississippi Delta (MS, USA) agricultural region. Similar sampling
and analytical methods allowed for direct comparison of results.
Decreased overall pesticide use in 2007 relative to 1995 generally
resulted in decreased detection frequencies in air and rain; observed
concentration ranges were similar between years, however, even though
the 1995 sampling site was 500 m from active fields whereas the 2007
sampling site was within 3 m of a field. Mean concentrations of
detections were sometimes greater in 2007 than in 1995, but the median
values were often lower. Seven compounds in 1995 and 5 in 2007 were
detected in ≥50% of both air and rain samples. Atrazine, metolachlor,
and propanil were detected in ≥50% of the air and rain samples in both
years. Glyphosate and its degradation product, aminomethyl-phosphonic
acid (AMPA), were detected in ≥75% of air and rain samples in 2007 but
were not measured in 1995. The 1995 seasonal wet depositional flux was
dominated by methyl parathion (88%) and was >4.5 times the 2007 flux.
Total herbicide flux in 2007 was slightly greater than in 1995 and was
dominated by glyphosate. Malathion, methyl parathion, and degradation
products made up most of the 2007 nonherbicide flux.
© 2014 SETAC.
© 2014 SETAC.
KEYWORDS:
Air; Deposition flux; Pesticides; Rain- PMID:
- 24549493
- [PubMed - indexed for MEDLINE]
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