Degradation and disposal of scepter herbicide by hydrogen peroxide-catalyzed ozonation
1997
Massey, J.H. | Lavy, T.L.
Studies were conducted to determine the ability of ozonation catalyzed by hydrogen peroxide (H2O2) to degrade solutions of Scepter herbicide (imazaquin). Scepter herbicide solutions were rapidly degraded using a range of solution temperatures (1-35 degrees C) and H2O2 concentrations (0-69 mM). The most rapid degradation occurred when the [H2O2] was 0.2 mM; imazaquin was also rapidly degraded in the absence of H2O2. The ozonation times required for 90% removal of the herbicide were typically < 15 min. Approximately 10.5 +/- 4.4% (quinoline ring) to 17.1 +/- 7.8% (carboxylic acid) of [14C]imazaquin was oxidized to 14CO2 when solutions with pH values ranging from 5.5 to 8.5 were ozonated for 0.5 h at 20 degrees C. Resulting ozonation products, which included nitrate, exhibited rapid biomineralization when added to two soils. The ozonation products of Scepter herbicide were not phytotoxic when applied to cotton, corn, and soybean seedlings at application rates equivalent to 34 g a.i./ha.
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