Bioavailability of an organophosphorus pesticide, fenamiphos, sorbed on an organo clay

Singh, Neera, Megharaj, M., Gates, W.P., Churchman, G.J., Anderson, J., Kookana, R.S., Naidu, R., Chen, Z., Slade, P.G. and Sethunathan, N. 2003, Bioavailability of an organophosphorus pesticide, fenamiphos, sorbed on an organo clay, Journal of agricultural and food chemistry, vol. 51, no. 9, pp. 2653-2658, doi: 10.1021/jf025978p.

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Title Bioavailability of an organophosphorus pesticide, fenamiphos, sorbed on an organo clay
Author(s) Singh, Neera
Megharaj, M.
Gates, W.P.ORCID iD for Gates, W.P.
Churchman, G.J.
Anderson, J.
Kookana, R.S.
Naidu, R.
Chen, Z.
Slade, P.G.
Sethunathan, N.
Journal name Journal of agricultural and food chemistry
Volume number 51
Issue number 9
Start page 2653
End page 2658
Total pages 6
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2003-04-23
ISSN 0021-8561
Keyword(s) Adsorption
Aluminum Silicates
Biodegradation, Environmental
Biological Availability
Organophosphorus Compounds
Spectrophotometry, Infrared
organo clay
Summary Hydrolysis of an insecticide/nematicide, fenamiphos [ethyl-3-methyl-4-(methylthio)phenyl-(1-methylethyl)phosphoramidate], immobilized through sorption by cetyltrimethylammonium-exchanged montmorillonite (CTMA-clay) by a soil bacterium, Brevibacterium sp., was examined. X-ray diffraction analysis, infrared spectra, and a negative electrophoretic mobility strongly indicated that fenamiphos was intercalated within the bacterially inaccessible interlayer spaces of CTMA-clay. The bacterium hydrolyzed, within 24 h, 82% of the fenamiphos sorbed by the CTMA-clay complex. There was a concomitant accumulation of hydrolysis product, fenamiphos phenol, in nearly stoichiometric amounts. During the same period, in abiotic (uninoculated) controls, 4.6% of the sorbed insecticide was released into the aqueous phase as compared to 6.0% of the sorbed fenamiphos in another abiotic control where activated carbon, a sink for desorbed fenamiphos, was present. Thus, within 24 h, the bacterium hydrolyzed 77% more fenamiphos sorbed by organo clay than the amounts desorbed in abiotic controls. Such rapid degradation of an intercalated pesticide by a bacterium has not been reported before. Evidence indicated that extracellular enzymes produced by the bacterium rapidly hydrolyzed the nondesorbable fenamiphos, even when the enzyme itself was sorbed. Fenamiphos strongly sorbed to an organo clay appears to be readily available for exceptionally rapid degradation by the bacterium.
Language eng
DOI 10.1021/jf025978p
Field of Research 03 Chemical Sciences
07 Agricultural And Veterinary Sciences
09 Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, American Chemical Society
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