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이흥재(Heung-Jae Lee),유원근(Won-Kun Yu),김균도(Kyun-Do Kim),임찬호(Chan-Ho Lim),김태균(Tae-Kyun Kim),신정훈(Jeong-Hoon Shin),남수철(Su-Chul Nam) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
최근 구미 선진국에서 빈발하고 있는 전압붕괴로 인한 대규모 정전사고의 확률이 점증하고 있어 전압관리가 현재 및 향후 전력계통의 문제점으로 대두되고 있으며, 이러한 문제들에 대한 대비가 시급한 실정이다. 이미 여러 선진국에서는 자국계통 특성에 적합한 전압, 무효전력 제어시스템을 개발하여 실계통에서 운용하고 있는 실정이다. 최근 우리나라에서도 전압안정도 측면에서 전압제어시스템의 필요성을 인식하고 전력 IT과제를 통하여 전압제어시스템을 개발하였다. 본 논문에서는 RTDS(Real Time Digital Simulator)를 통해 구축된 제주계통을 대상으로 개발된 지능형 전압제어시스템의 성능을 검증하였다.
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장희라 ( Hee Ra Chang ),강혜림 ( Hae Rim Kang ),김종환 ( Jong Hwan Kim ),도정아 ( Jung A Do ),오재호 ( Jae Ho Oh ),권기성 ( Ki Sung Kwon ),임무혁 ( Moo Hyeong Im ),김균 ( Kyun Kim ) 한국환경농학회 2012 한국환경농학회지 Vol.31 No.2
BACKGROUND: For the safety of imported agricultural products, the study was conducted to develop the analytical method of unregistered pesticides in domestic. The analytical method of 6 pesticides, chlorthal-dimethyl, clomeprop, diflufenican, hexachlorobenzene, picolinafen, and propyzamide, for a fast multi-residue analysis were established for two different type crops, orange and brown rice by GC-ECD and confirmed by mass spectrometry. METHODS AND RESULTS: The analytical method was evaluated to limit of quantification, linearity and recoveries. The crop samples were extracted with acetonitrile and performed cleanup by liquid-liquid partition and Florisil SPE to remove co-extracted matrix. The extracted samples were analyzed by GC-ECD with good sensitivity and selectivity of the method. The limits of quantification (LOQ) range of the method with S/N ratio of 10 was 0.02∼0.05 mg/kg for orange and brown rice. The linearity for targeted pesticides were R2 >0.999 at the levels ranged from 0.05 to 10.0 mg/kg. The average recoveries ranged from 74.4% to 110.3% with the percentage of coefficient variation in the range 0.2∼8.8% at two different spiking levels (0.02 mg/kg and 0.2 mg/kg, 0.05 mg/kg and 0.5 mg/kg) in brown rice. And the average recoveries ranged from 77.8% to 118.4% with the percentage of coefficient variation in the range 0.2∼6.6% at two different spiking levels (0.02 mg/kg and 0.2 mg/kg, 0.05 mg/kg and 0.5mg/kg) in orange. Final determination was by gas chromatography/mass spectrometry/selected ion monitoring (GC/MS/SIM) to identify the targeted pesticides. CONCLUSION: As a result, this developed analytical method can be used as an official method for imported agricultural products.
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수출용 단감에 대한 Difenoconazole과 Thiamethoxam의 잔류특성 연구
장희라 ( Hee Ra Chang ),강혜림 ( Hae Rim Kang ),도정아 ( Jung A Do ),오재호 ( Jae Ho Oh ),황인균 ( In Kyun Hwang ),권기성 ( Ki Sung Kwon ),임무혁 ( Moo Hyeong Im ),김균 ( Kyun Kim ) 한국환경농학회 2012 한국환경농학회지 Vol.31 No.3
BACKGROUND: In order to elucidate residual characteristics of difenoconazole and thiamethoxam by treatment to sweet persimmons for one year and to generate the data for the maximum residue limit (MRL) establishment for those pesticides in or on sweet persimmon. METHODS AND RESULTS: Systemic fungicide difenoconazole WP (10% a.i.) and systemic insecticide thiamethoxam WG (10%ai.) were sprayed onto 12∼25-years-old sweet persimmons according to its preharvest interval (PHI), respectively, and then fresh sweet persimmons were harvested at 0, 1, 3, 7, 14, 21 days after treatment from pesticide-sprayed plots at each 3 sites. The analytical methods were evaluated to limit of quantification, linearity, specificity, reproducibility and recoveries. The crop samples were extracted with acetone and performed dichloromethane partition process. The extracted samples of difenoconazole were analyzed by GC-ECD and the thiamethoxam extracted samples were analyzed by HPLC with good sensitivity and selectivity of the method. The average recoveries of difenoconazole ranged from 87.5 to 99.5% with the percentage of coefficient variation in the range 4.1∼7.6% at three different spiking levels(0.02, 0.2 and 2.0 mg/kg). And the average recoveries of thiamethoxam and clothianidin ranged from 88.8 to 98.9% and 83.2 to 96.6% with the percentage of coefficient variation in the range 3.6∼5.0% and 3.8∼9.4% at three different spiking levels(0.02, 0.2 and 2.0 mg/kg), respectively. The residue amounts ranges of difenoconazole were 0.2∼0.56 mg/kg and the residue amount was decreased below the MRL level, 1.0 mg/kg, after 1 day harvest. The residue amounts ranges of thiamethoxam were 0.08∼0.28 mg/kg and the residue amount was decreased below the MRL level, 0.5 mg/kg, after 1 day harvest. And the residue amount of clothianidin was below then 0.03 mg/kg for only one test site of 14 and 28 day samples. CONCLUSION: As a result, the residual amounts of difenoconazole and thiamethoxam were not exceeded the MRL of established criteria for sweet persimmon. The biological half-lives of difenoconazole and thiamethoxam were 13.6, 19.4, 16.3 and 10.0, 15.3, 14.0 days at each three test sites, respectively.
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