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Low pressure UV/H2O2 treatment for the degradation of the pesticides metaldehyde, clopyralid and mecoprop - Kinetics and reaction product formation.
Water Res. 2016 Mar 15; 91:285-94.WR

Abstract

The degradation kinetics of three pesticides - metaldehyde, clopyralid and mecoprop - by ultraviolet photolysis and hydroxyl radical oxidation by low pressure ultraviolet hydrogen peroxide (LP-UV/H2O2) advanced oxidation was determined. Mecoprop was susceptible to both LP-UV photolysis and hydroxyl radical oxidation, and exhibited the fastest degradation kinetics, achieving 99.6% (2.4-log) degradation with a UV fluence of 800 mJ/cm(2) and 5 mg/L hydrogen peroxide. Metaldehyde was poorly degraded by LP-UV photolysis while 97.7% (1.6-log) degradation was achieved with LP-UV/H2O2 treatment at the maximum tested UV fluence of 1000 mJ/cm(2) and 15 mg/L hydrogen peroxide. Clopyralid was hardly susceptible to LP-UV photolysis and exhibited the lowest degradation by LP-UV/H2O2 among the three pesticides. The second-order reaction rate constants for the reactions between the pesticides and OH-radicals were calculated applying a kinetic model for LP-UV/H2O2 treatment to be 3.6 × 10(8), 2.0 × 10(8) and 1.1 × 10(9) M(-1) s(-1) for metaldehyde, clopyralid and mecoprop, respectively. The main LP-UV photolysis reaction product from mecoprop was 2-(4-hydroxy-2-methylphenoxy) propanoic acid, while photo-oxidation by LP-UV/H2O2 treatment formed several oxidation products. The photo-oxidation of clopyralid involved either hydroxylation or dechlorination of the ring, while metaldehyde underwent hydroxylation and produced acetic acid as a major end product. Based on the findings, degradation pathways for the three pesticides by LP-UV/H2O2 treatment were proposed.

Authors+Show Affiliations

Department of Civil and Environmental Engineering, Imperial College London, London, UK; Wetsus, European Centre of Excellence for Sustainable Water Technology, Leeuwarden, The Netherlands. Electronic address: s.semitsoglou-tsiapou12@imperial.ac.uk.Department of Civil and Environmental Engineering, Imperial College London, London, UK.Department of Civil and Environmental Engineering, Imperial College London, London, UK.Wetsus, European Centre of Excellence for Sustainable Water Technology, Leeuwarden, The Netherlands.PWN Technologies, Velserbroek, The Netherlands.Trojan Technologies, London, Ontario, Canada.Wetsus, European Centre of Excellence for Sustainable Water Technology, Leeuwarden, The Netherlands.

Pub Type(s)

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

Language

eng

PubMed ID

26803264

Citation

Semitsoglou-Tsiapou, Sofia, et al. "Low Pressure UV/H2O2 Treatment for the Degradation of the Pesticides Metaldehyde, Clopyralid and Mecoprop - Kinetics and Reaction Product Formation." Water Research, vol. 91, 2016, pp. 285-94.
Semitsoglou-Tsiapou S, Templeton MR, Graham NJ, et al. Low pressure UV/H2O2 treatment for the degradation of the pesticides metaldehyde, clopyralid and mecoprop - Kinetics and reaction product formation. Water Res. 2016;91:285-94.
Semitsoglou-Tsiapou, S., Templeton, M. R., Graham, N. J., Hernández Leal, L., Martijn, B. J., Royce, A., & Kruithof, J. C. (2016). Low pressure UV/H2O2 treatment for the degradation of the pesticides metaldehyde, clopyralid and mecoprop - Kinetics and reaction product formation. Water Research, 91, 285-94. https://doi.org/10.1016/j.watres.2016.01.017
Semitsoglou-Tsiapou S, et al. Low Pressure UV/H2O2 Treatment for the Degradation of the Pesticides Metaldehyde, Clopyralid and Mecoprop - Kinetics and Reaction Product Formation. Water Res. 2016 Mar 15;91:285-94. PubMed PMID: 26803264.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Low pressure UV/H2O2 treatment for the degradation of the pesticides metaldehyde, clopyralid and mecoprop - Kinetics and reaction product formation. AU - Semitsoglou-Tsiapou,Sofia, AU - Templeton,Michael R, AU - Graham,Nigel J D, AU - Hernández Leal,Lucía, AU - Martijn,Bram J, AU - Royce,Alan, AU - Kruithof,Joop C, Y1 - 2016/01/12/ PY - 2015/09/19/received PY - 2015/12/19/revised PY - 2016/01/09/accepted PY - 2016/1/25/entrez PY - 2016/1/25/pubmed PY - 2016/11/3/medline KW - Clopyralid KW - Kinetics KW - LP-UV/H(2)O(2) KW - Mecoprop KW - Metaldehyde KW - Reaction products SP - 285 EP - 94 JF - Water research JO - Water Res VL - 91 N2 - The degradation kinetics of three pesticides - metaldehyde, clopyralid and mecoprop - by ultraviolet photolysis and hydroxyl radical oxidation by low pressure ultraviolet hydrogen peroxide (LP-UV/H2O2) advanced oxidation was determined. Mecoprop was susceptible to both LP-UV photolysis and hydroxyl radical oxidation, and exhibited the fastest degradation kinetics, achieving 99.6% (2.4-log) degradation with a UV fluence of 800 mJ/cm(2) and 5 mg/L hydrogen peroxide. Metaldehyde was poorly degraded by LP-UV photolysis while 97.7% (1.6-log) degradation was achieved with LP-UV/H2O2 treatment at the maximum tested UV fluence of 1000 mJ/cm(2) and 15 mg/L hydrogen peroxide. Clopyralid was hardly susceptible to LP-UV photolysis and exhibited the lowest degradation by LP-UV/H2O2 among the three pesticides. The second-order reaction rate constants for the reactions between the pesticides and OH-radicals were calculated applying a kinetic model for LP-UV/H2O2 treatment to be 3.6 × 10(8), 2.0 × 10(8) and 1.1 × 10(9) M(-1) s(-1) for metaldehyde, clopyralid and mecoprop, respectively. The main LP-UV photolysis reaction product from mecoprop was 2-(4-hydroxy-2-methylphenoxy) propanoic acid, while photo-oxidation by LP-UV/H2O2 treatment formed several oxidation products. The photo-oxidation of clopyralid involved either hydroxylation or dechlorination of the ring, while metaldehyde underwent hydroxylation and produced acetic acid as a major end product. Based on the findings, degradation pathways for the three pesticides by LP-UV/H2O2 treatment were proposed. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/26803264/Low_pressure_UV/H2O2_treatment_for_the_degradation_of_the_pesticides_metaldehyde_clopyralid_and_mecoprop___Kinetics_and_reaction_product_formation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(16)30017-3 DB - PRIME DP - Unbound Medicine ER -