http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
HPLC-UV검출기를 이용한 논토양 중 oxolinic acid 분석
노석초(Seog-Cho Lo),마상용(Sang-Yong Ma),한성수(Seong-Soo Han) 한국농약과학회 2005 농약과학회지 Vol.9 No.4
This study was performed to examine analytical method of a quinolone compound, oxolinic acid in paddy soil by HPLC coupled with UV detector. Two types of soil texture in different regions were used for this experiment. Oxolinic acid was extracted by a 4 M-KOH : MeOH(1 : 3, v/v) mixtures and acidified followed by liquid-liquid partitioning in dichloromethane. Dichlormethane layer was dehydrated, evaporated and analyzed by HPLC (262 nm). Retention time was 10.2 min. The standard calibration curve of oxolinic acid showed linearity (r²>0.999<SUP>**</SUP>, y=378.99x+135.08) in the range of 1~40 ng. The mean recoveries, evaluated from fortified soil samples at two concentration levels of 0.2 ㎎/㎏ and 1.0 ㎎/㎏, were 90.9±4.52%(C.V. 4.97%) and 95.0±0.23%(C.V. 0.24%) for soil 1 and 92.2±1.15%(C.V. 1.25%) and 93.1±0.31% (C.V. 0.33%) for soil 2, respectively. The detection limits of two types of soils were same as 0.05 ppm. Overall, the present analytical method of oxolinic acid by HPLC coupled with UV detector seems to be used reasonably.
살충제 thiodicarb의 단감 중 잔류분석 및 안전성 평가
노석초(Seog Cho Lo),황철환(Cheol Hwan Hwang),김민수(Min Soo Kim),마상용(Sang Yong Ma),한성수(Seong Soo Han) 한국농약과학회 2004 농약과학회지 Vol.8 No.3
The residue analysis of the insecticide thiodicarb in sweet persimmon was analyzed with a gas chromatograph equipped with nitrogen phosphorus detector(NPD) to evaluate efficacy of analysis method and safety of thiodicarb in persimmon. Minimum detectable amount of methomyl oxime, hydrolysate of thiodicarb, was 0.2 ng and detection limit of thiodicarb was 0.05 ppm. The mean recoveries evaluated from untreated samples spiked at 0.5 ppm and 2.5 ppm were 93.9±3.9 and 92.8±2.0%, respectively. When thiodicarb was sprayed onto the sweet persimmon two times until 40 and 30 days before harvest, three times until 40, 30 and 21 days before harvest, and four times until 40, 30, 21 and 14 days before harvesting, the mean residual amount in sweet persimmon were 1.50±0.04, 1.86±0.04 and 2.11±0.12 ppm, respectively. It would be safe when thiodicarb 40% WP is treated four times 14 days before harvesting to control fruit moth in sweet persimmon.
pH조절 분배추출에 의한 식물체 중 Methoxyfenozide와 Bentazone의 HPLC 분석
노석초 ( Seog Cho Lo ),황철환 ( Cheol Hwan Hwang ),유기용 ( Ki Yong Yoo ),한성수 ( Seong Soo Han ) 한국환경농학회 2007 한국환경농학회지 Vol.26 No.3
This study was performed to enhance the cleanup efficiency of methoxyfenozide and bentazone by pH adjustment in the course of liquid-liquid partition and to develop an optimum analytical conditions using HPLC coupled with DAD for two matrices, brown rice and rice straw. Preparation procedure of brown rice sample was extraction→coagulation→liquid-liquid partition→florisil C.C, and this procedure was samely applied to two compounds. In rice straw, preparation procedure of methoxyfenozide sample was extraction→alkalization→liquid-liquid extraction→coagulation→florisil C.C, and in the case of bentazone, extraction→alkalization→liquid-liquid partition→acidification→liquid-liquid extraction→florisil C.C. All these purified samples were redissolved in the mobile phases, acetonitrile : 20 mM sodium acetate (75:25, v/v) for methoxyfenozide and acetonitrile : 75 mM sodium acetate, pH 6.0 (40:60, v/v) for bentazone. Recoveries of methoxyfenozide analysis in brown rice and rice straw were 83.5-97.4 and 86.4-97.3%, and detection limits were 0.02 and 0.04 mg/kg, respectively. Recoveries of bentazone in brown rice and rice straw were 86.8-101.9 and 88.3-94.5% and detection limits were 0.005 and 0.01 mg/kg, respectively. This methods seem to be usefully applied to the residue analysis of two compounds in the view of producing stable analytical condition and fair reproducibility.