http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
농약의 토양 표면 유출에 관한 연구-II 포장에서 인공강우에 의한 phorate의 유출특성
김균,염동혁,김정한,이성규,김용화,박창규 ( Kyun Kim,Dong Hyuk Yeom,Jeong Han Kim,Sung Kyu Lee,Yong Hwa Kim,Chang Kyu Park ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.4
Runoff of phorate, soil insecticide, were measured under simulated rainfall conditions in field using small test plot(120×120 ㎝) at the loam area and loamy sand area. Fish acute toxicity tests were performed with runoff water to elucidate its toxicological effect on organisms in ecosystem. The average concentrations of phorate in runoff water from loam and loamy sand soil were 11.3 ppb and 4.8 ppb, respectively. However, there was no significant concentration difference between the heavy and the light rain. With loam soil, average runoff rates were 1.31 and 0.18%, while with loamy sand soil those were 0.48 and 0.012% under the heavy and the light rain conditions, respectively. Total average runoff rate was 0.50%. With killifish, no mortality was observed in runoff water from loamy sand soil, whereas half of the population was dead in runoff water from loam soil when it was diluted to 54.4% content.
농약의 물리화학적 특성연구 (1) Captafol의 수용성 , 가수분해 , 증기압 , 옥탄올 / 물 분배계수
김균,김정한,이성규,김용화 ( Kyun Kim,Jeong Han Kim,Sung Kyu Lee,Yong Hwa Kim ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.1
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.
농약의 물리화학적 특성 연구 (2) Flupyrazofos의 수용성 , 가수분해 , 증기압 , 옥탄올 / 물 분배계수
김균,김정한,김용화 ( Kyun Kim,Jeong Han Kim,Yong Hwa Kim ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.1
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.