PMID: 16509318Mar 3, 2006Paper

Degradation of naled and dichlorvos promoted by reduced sulfur species in well-defined anoxic aqueous solutions

Environmental Science & Technology
Qiu GanUrs Jans

Abstract

This work examines the reaction of reduced sulfur species (e.g., bisulfide, thiosulfate, thiophenolate) with naled, a registered insecticide, in well-defined anoxic aqueous solutions at 5 degrees C. High concentrations of reduced sulfur species can occur in the porewater of sediments and in anoxic subregions of estuaries. The dominanttransformation product from the reaction of naled with reduced sulfur species is dichlorvos, which indicates that debromination is the major reaction pathway. Dichlorvos is also a registered insecticide which is more toxic than naled. The second-order rate constants for reaction of naled with bisulfide and thiophenolate at 5 degrees C are 10.2 +/- 0.4 M(-1) s(-1) and 27.3 +/- 0.9 M(-1) s(-1), respectively, while the second-order rate constant for the reaction of naled with hydrogen sulfide and thiophenol are not significantly different from zero. The second-order rate constant of the reaction of naled with thiosulfate at 5 degrees C is 5.0 +/- 0.3 M(-1) s(-1). In contrast, the second-order rate constant of the reaction of dichlorvos with bisulfide at 25 degrees C is (3.3 +/- 0.1) x 10(-3) M(-1) s(-1). The activation parameters of the reaction of naled with bisulfide were also determined from the me...Continue Reading

References

May 29, 1999·Environmental Health Perspectives·B EskenaziR Castorina
May 25, 2002·Environmental Science & Technology·K A Lippa, A L Roberts
Sep 7, 2002·Environmental Science & Technology·William A ArnoldChristopher J Cramer
Mar 20, 2003·Journal of Agricultural and Food Chemistry·Urs Jans, M Hasan Miah

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Citations

Apr 18, 2020·The Science of the Total Environment·Athena S JonesElsayed M Zahran
Jul 30, 2021·The Science of the Total Environment·Gbemisola J BamiduroElsayed M Zahran
Jul 15, 2011·Environmental Science & Technology·Teng ZengWilliam A Arnold
Dec 12, 2017·Journal of Agricultural and Food Chemistry·Saumil ChristianUrs Jans

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