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KMID : 0903519970400010076
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1997 Volume.40 No. 1 p.76 ~ p.79
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Study on Physicochemical Properties of Pesticide
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김용화/Kim, Yong Hwa
김정한/김균/Kim, Jeong Han/Kim, Kyun
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Abstract
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Several physicochemical properties such as water solubility, vapor pressure, hydrolysis and octanol/ water partition coefficient(Kow) of flupyrazofos, the first organophosphorus insecticide developed in Korea, were measured based on EPA and OECD methods. Water solubility was low showing 0.80 ppm at 25℃ and in hydrolysis study, half-life at 25℃ was 266.5 hr(pH 4.0), 180.0 hr(pH 7.0) and 120.9 hr(pH 9.0) demonstrating instability in alkaline solution. At 40℃ hydrolysis rate was 2∼4 times higher than that at 25℃. The equation log P=0.673-(1565.4/T) was obtained from vapor pressure experiments at three different temperatures (25, 35, 45℃) and 2.81×10^(-5) torr was obtained at 25℃. This value is similar to that of diazinon and 1,000 times lower than that of DDVP suggesting it would not give environmental contamination by volatilization. High log Kow(5.24) was observed and this might result in bioconcentration through food chain. However, its possibility is not likely to be high due to its relatively rapid hydrolysis.
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