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Determination of Kinetic Parameters of Ozone During Oxidations of Alachlor in Water
Author(s) -
Beltrán Fernando J.,
González Manuel,
Rivas F. Javier,
Acedo Benito
Publication year - 2000
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143000x138300
Subject(s) - alachlor , chemistry , ozone , hydroxyl radical , distilled water , radical , hydrogen peroxide , reaction rate constant , environmental chemistry , photochemistry , organic chemistry , chromatography , pesticide , kinetics , atrazine , physics , quantum mechanics , agronomy , biology
A study of the ozonation of the herbicide alachlor in distilled and surface water was performed. The influence of variables, including pH, water type, and free‐radical‐inhibiting substances, on the removal rate of alachlor was investigated. Alachlor was primarily removed from water through hydroxyl radical oxidation because low pH and the presence of natural substances such as carbonates significantly reduced the alachlor removal rate. Hydrogen peroxide was formed in low concentration during ozonation. Rate constants of the reactions between alachlor and ozone and between alachlor and the hydroxyl radicals were found to be 2.8 and 3.2 × 10 10 L/mol·s, respectively. Because combined UV radiation and ozonation constitute one of the possible ozonation processes to treat alachlor, the quantum yield of this herbicide was determined and found to be 0.177 mol/einstein, which is a significant value compared to others found for different herbicides.