Abstract
This study was conducted to investigate the effect of ozonated water and ozonated water+hydrogen peroxide treatment of residual procymidone in perilla leaf containing 20 mg/L procymidone. Samples was treated with ozonated water containing 1.0, 2.0 and 3.0 mg <TEX>$O_3/L$</TEX> ozone and hydrogen peroxide water containing 1.0, 2.0 and 3.0 mg <TEX>$H_2O_2/L$</TEX> hydrogen peroxide in pH 5, 7 and 9, respectively, at <TEX>$15^{\circ}C$</TEX>. Procymidone removal rate was 26.5% in 7 days at <TEX>$15^{\circ}C$</TEX> and optimum condition of procymidone removal was the case of treating with ozonated water containing 2.0 mg <TEX>$O_3/L$</TEX> and pH 9. As the result procymidone removal rate was about 96.5%. In this case of adding hydrogen peroxide, optimum condition of procymidone removal was <TEX>$1:0.5{\sim}1(O_3:H_2O_2)$</TEX>. However, procymidone was nearly removed with the treatment of hydrogen peroxide water only.
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