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A comparative study on the aqueous photodegradation of two organophosphorus pesticides under simulated and natural sunlight.
J Environ Monit. 2009 Mar; 11(3):654-9.JE

Abstract

Aqueous solutions of fenitrothion and methyl parathion were photochemically degraded in an Atlas Suntest solar simulator (500 W m(-2)) as well as under ambient sunlight at Lancaster University (June & August 2007, 54 degrees N) and the degradation kinetics and disappearance quantum yields are reported. Fenitrothion degradation confirmed to first order kinetics (r(2) = 0.90-0.99) with a half-life range of 4.9 h-5.3 h, shorter than previously reported studies. In contrast, methyl parathion did not show significant degradation over the duration of these experiments. Light irradiances were monitored with a spectroradiometer during the Suntest simulator and outdoor experiments. The filtered-xenon arc lamp of the Suntest yielded spectral irradiances comparable to natural sunlight in the UVB and UVA wavelength range (280-400 nm), but with higher irradiances in the visible region (400-750 nm). Nonetheless, as both compounds have light absorption spectra at wavelengths < 400 nm, then the half-lives and disappearance quantum yields were similar between the Suntest and natural sunlight, and demonstrated that the Suntest is suitable for environmentally-relevant photochemical degradation experiments.

Authors+Show Affiliations

Lancaster Environment Centre, Lancaster University, Lancaster, UK.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19280044

Citation

Weber, Jan, et al. "A Comparative Study On the Aqueous Photodegradation of Two Organophosphorus Pesticides Under Simulated and Natural Sunlight." Journal of Environmental Monitoring : JEM, vol. 11, no. 3, 2009, pp. 654-9.
Weber J, Halsall CJ, Wargent JJ, et al. A comparative study on the aqueous photodegradation of two organophosphorus pesticides under simulated and natural sunlight. J Environ Monit. 2009;11(3):654-9.
Weber, J., Halsall, C. J., Wargent, J. J., & Paul, N. D. (2009). A comparative study on the aqueous photodegradation of two organophosphorus pesticides under simulated and natural sunlight. Journal of Environmental Monitoring : JEM, 11(3), 654-9. https://doi.org/10.1039/b811387d
Weber J, et al. A Comparative Study On the Aqueous Photodegradation of Two Organophosphorus Pesticides Under Simulated and Natural Sunlight. J Environ Monit. 2009;11(3):654-9. PubMed PMID: 19280044.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A comparative study on the aqueous photodegradation of two organophosphorus pesticides under simulated and natural sunlight. AU - Weber,Jan, AU - Halsall,Crispin J, AU - Wargent,Jason J, AU - Paul,Nigel D, Y1 - 2009/01/08/ PY - 2009/3/13/entrez PY - 2009/3/13/pubmed PY - 2009/6/25/medline SP - 654 EP - 9 JF - Journal of environmental monitoring : JEM JO - J Environ Monit VL - 11 IS - 3 N2 - Aqueous solutions of fenitrothion and methyl parathion were photochemically degraded in an Atlas Suntest solar simulator (500 W m(-2)) as well as under ambient sunlight at Lancaster University (June & August 2007, 54 degrees N) and the degradation kinetics and disappearance quantum yields are reported. Fenitrothion degradation confirmed to first order kinetics (r(2) = 0.90-0.99) with a half-life range of 4.9 h-5.3 h, shorter than previously reported studies. In contrast, methyl parathion did not show significant degradation over the duration of these experiments. Light irradiances were monitored with a spectroradiometer during the Suntest simulator and outdoor experiments. The filtered-xenon arc lamp of the Suntest yielded spectral irradiances comparable to natural sunlight in the UVB and UVA wavelength range (280-400 nm), but with higher irradiances in the visible region (400-750 nm). Nonetheless, as both compounds have light absorption spectra at wavelengths < 400 nm, then the half-lives and disappearance quantum yields were similar between the Suntest and natural sunlight, and demonstrated that the Suntest is suitable for environmentally-relevant photochemical degradation experiments. SN - 1464-0333 UR - https://www.unboundmedicine.com/medline/citation/19280044/A_comparative_study_on_the_aqueous_photodegradation_of_two_organophosphorus_pesticides_under_simulated_and_natural_sunlight_ L2 - https://doi.org/10.1039/b811387d DB - PRIME DP - Unbound Medicine ER -