PMID: 16509335Mar 3, 2006Paper

Kinetics and mechanism of the degradation of methyl parathion in aqueous hydrogen sulfide solution: investigation of natural organic matter effects

Environmental Science & Technology
Xiaofen Guo, Urs Jans

Abstract

The kinetics of the transformation of methyl parathion have been investigated in aqueous solution containing reduced sulfur species and small concentrations of natural organic matter (NOM) from different sources such as soil, river, and peat. It was shown that NOM mediates the degradation of methyl parathion in aqueous solutions containing hydrogen sulfide. After evaluating and quantifying the effect of the NOM concentration on the degradation kinetics of methyl parathion in the presence of hydrogen sulfide, it was found that the observed pseudo-first-order reaction rate constants (k(obs)) were proportional to NOM concentrations. The influence of pH on the degradation of methyl parathion in the aqueous solutions containing hydrogen sulfide and NOM has been studied. The rate of degradation of methyl parathion was strongly pH dependent. The results indicate k(obs) with a commercially available humic acid has a maximum value at approximately pH 8.3. Two main reaction mechanisms are identified to dominate the degradation of methyl parathion in aqueous solution containing hydrogen sulfide and NOM based on the products aminomethyl parathion and desmethyl methyl parathion. The two mechanisms are nitro-group reduction and nucleophilic ...Continue Reading

References

May 30, 2002·Journal of Agricultural and Food Chemistry·Dimitra A Lambropoulou, Triantafyllos A Albanis
Jul 9, 2002·Environmental Science & Technology·J A PerlingerW Angst
Jul 11, 2002·Water Research·Dag O Andersen, Egil T Gjessing
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Jul 12, 2003·Environmental Science & Technology·Andreas Kappler, Stefan B Haderlein
Aug 10, 2004·Environmental Science & Technology·Spencer S WalseJohn L Ferry

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Citations

Feb 9, 2012·Environmental Science & Technology·Teng ZengWilliam A Arnold
Nov 3, 2010·Journal of Hazardous Materials·Peng CaiWei Liang
Aug 19, 2015·Environmental Science and Pollution Research International·Yuan LiuJianwei Wang
Oct 7, 2016·Environmental Science. Processes & Impacts·Rachel M AdamsYu-Ping Chin
Feb 5, 2013·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Thiago M R AraújoPaulo C M L Miranda
Sep 20, 2008·Environmental Science & Technology·Dalizza ColónJames L Anderson
Jul 15, 2011·Environmental Science & Technology·Teng ZengWilliam A Arnold

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