Bedoukian   RussellIPM   RussellIPM   Piezoelectric Micro-Sprayer


Home
Animal Taxa
Plant Taxa
Semiochemicals
Floral Compounds
Semiochemical Detail
Semiochemicals & Taxa
Synthesis
Control
Invasive spp.
References

Abstract

Guide

Alphascents
Pherobio
InsectScience
E-Econex
Counterpart-Semiochemicals
Print
Email to a Friend
Kindly Donate for The Pherobase

« Previous AbstractMicrocosm studies on the air-soil exchange of hexachlorobenzene and polychlorinated biphenyls    Next AbstractMeasurement of DDT fluxes from a historically treated agricultural soil in Canada »

Environ Sci Technol


Title:Chiral organochlorine pesticide signatures in global background soils
Author(s):Kurt-Karakus PB; Bidleman TF; Jones KC;
Address:"Environmental Science Department, Lancaster University, Lancaster LA1 4YQ, UK"
Journal Title:Environ Sci Technol
Year:2005
Volume:39
Issue:22
Page Number:8671 - 8677
DOI: 10.1021/es051004c
ISSN/ISBN:0013-936X (Print) 0013-936X (Linking)
Abstract:"Chiral pesticides frequently undergo enantioselective degradation in soils. Prior studies to characterize chiral signatures have focused on treated agricultural soils, rather than background (untreated) soils, and tracking signatures in the atmosphere for source apportionment purposes. In this study, we investigated the chiral signatures in 65 background soils collected from different locations across the world. The soils were taken from different ecosystems (e.g., grasslands, forests), and the enantiomeric fractions (EFs) of chiral chlordanes, alpha-hexachlorocyclohexane (alpha-HCH), and o,p'-DDT were determined. Chlordanes in most of the soils showed the usual pattern of enantioselective degradation seen in agricultural soils, depletion of (+)-trans-chlordane (TC) and (-)-cis-chlordane (CC). However, some samples showed opposite enantiomer degradation patterns for TC, CC, and chlordane compound MC5. Correlations were tested between the deviation of EFs from racemic (DEVrac = absolute value of 0.500 - EF), the percent soil organic matter (% SOM), annual mean temperature, and the ratio of TC to the more stable compound trans-nonachlor (TN). Significant positive correlations were found between DEVrac and % SOM for TC and CC (p = 0.0022 and 0.0031), but not for the other OCPs. No significant correlations were found between DEVrac and annual mean temperature for any of the OCPs. DEVrac for TC was negatively correlated with the TC/TN ratio, but the regression was driven by two points with high ratios of TC/CC. Removing these two points resulted in a nonsignificant regression. The range of EFs for TC, CC, and alpha-HCH in soils was greater than in ambient air, providing evidence of in situ degradation after atmospheric deposition in some cases. Variable EFs in soil suggest that caution is needed when considering the enantiomer signatures in air as a marker of volatilization of weathered soil-derived organochlorines"
Keywords:"Chlordan/analysis/metabolism DDT/analysis/metabolism Environmental Monitoring Environmental Pollutants/*analysis/metabolism Geography Hexachlorocyclohexane/analysis/metabolism Hydrocarbons, Chlorinated/*analysis/metabolism Pesticide Residues/*analysis/met;"
Notes:"MedlineKurt-Karakus, Perihan B Bidleman, Terry F Jones, Kevin C eng Research Support, Non-U.S. Gov't 2005/12/06 Environ Sci Technol. 2005 Nov 15; 39(22):8671-7. doi: 10.1021/es051004c"

 
Back to top
 
Citation: El-Sayed AM 2024. The Pherobase: Database of Pheromones and Semiochemicals. <http://www.pherobase.com>.
© 2003-2024 The Pherobase - Extensive Database of Pheromones and Semiochemicals. Ashraf M. El-Sayed.
Page created on 06-11-2024