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KMID : 0903519970400010071
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1997 Volume.40 No. 1 p.71 ~ p.75
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Study on Physicochemical Properties of Pesticide
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이성규/Lee, Sung Kyu
김용화/김정한/김균/Kim, Yong Hwa/Kim, Jeong Han/Kim, Kyun
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Abstract
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Important physicochemical properties of captafol[N-(1,1,2,2-tetrachloro- ethylthio)cyclohex-4-ene-1,2-dicarboximide], water solubility, vapor pressure, hydrolysis and octanol/water partition coefficient(Kow) were measured based on the standard EPA and OECD methods. Water solubility of the chemical was 2.24 ppm at 25℃. Half-life by hydrolysis at 25℃ in the buffer solution of pH 3.0, pH 7.0, and pH 8.0 was 77.8 hr, 6.54 hr and 0.72 hr, respectively, demonstrating instability in alkaline solution. The half-life in acid condition was not significantly different by temperature change, however, that in neutral or alkaline solution became shorter at 40℃. Hydrolysis study with a reference compound, diazinon, proved that the experimental method of the present study is reliable. Vapor pressure of captafol, 8.27×10^(-9) torr at 20℃, was calculated from the equation, log P=6.94-(4401.6/T) plotted on the experiment results under different temperature conditions, 40, 50, and 60℃. Judging from this vapor pressure of captafol, the contamination of captafol would not happen easily in environment by vaporization. High Kow value of 1,523 was observed and this might result in bioconcentration through food chain when captafol was exposed. However, affecting human health through aquatic bioaccumulation is not likely to occur due to its rapid hydrolysis in the environment.
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