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Advanced oxidation for the treatment of chlorpyrifos in aqueous solution. | LitMetric

Advanced oxidation for the treatment of chlorpyrifos in aqueous solution.

Chemosphere

National Center of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan; Department of Civil and Environmental Engineering, University of California, CA 92697-2175, United States.

Published: October 2013

AI Article Synopsis

  • Chlorpyrifos is a toxic organophosphate pesticide that can cause serious health issues, prompting research into its degradation methods due to environmental concerns.
  • The study investigated the effectiveness of gamma irradiation on chlorpyrifos in water, achieving complete degradation at certain doses, particularly using a concentration of 500 μg L(-1) treated with 575 Gy.
  • Findings indicated that hydroxyl radicals played a critical role in breaking down chlorpyrifos, while other radicals contributed less; the study also identified inorganic by-products produced during this degradation process.

Article Abstract

Chlorpyrifos is an organophosphate pesticide and is significant because of its extensive use, persistence in the environment, wide distribution, and its toxicity may lead to lung and central nervous system damage, developmental and autoimmune disorders and vomiting. In the present study, the irradiation of chlorpyrifos in aqueous solution by (60)Co γ-rays was conducted on a laboratory scale and the removal efficiency of chlorpyrifos was investigated. The SPME-GC-ECD method was used for analysis of chlorpyrifos. Aqueous solutions of different concentrations of target compound (200-1000 μg L(-1)) were irradiated through 30-575 Gy. Gamma irradiation showed 100% degradation for a 500 μg L(-1) solution at an absorbed dose of 575 Gy (the dose rate was 300 Gy h(-1)). The radiolysis of chlorpyrifos was pseudo-first order (decay) with respect to dose. The dose constants determined in this study ranged from 8.2×10(-3) to 2.6×10(-2) Gy(-1), and decreased with an increase in the initial concentration of chlorpyrifos, while the radiation chemical yield (G-value) for the loss of chlorpyrifos was found to decrease with increasing absorbed dose. The effect of saturated solutions of N2 and N2O, and radical scavengers tert-butanol, iso-propanol, H2O2, NaNO3 and NaNO2 on the degradation of chlorpyrifos were also studied. The results showed that the oxidative OH was the most important in the degradation of chlorpyrifos, while the reductive radicals, aqueous electron and H, were of less importance for the degradation of chlorpyrifos. The inorganic by-products Cl(-), SO4(2-) and PO4(3-) were quantitatively determined by IC.

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Source
http://dx.doi.org/10.1016/j.chemosphere.2013.06.051DOI Listing

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