A5031486124- Pesticide Residue Analysis and Safety
- Pesticide and Herbicide Environmental Studies
- Insect and Pesticide Research
- Fungal Plant Pathogen Control
- Agriculture, Soil, Plant Science
- Semiconductor materials and devices
- Metal and Thin Film Mechanics
- Agricultural safety and regulations
- Mycotoxins in Agriculture and Food
- Garlic and Onion Studies
- Natural Products and Biological Research
- Engineering Applied Research
- Recycling and Waste Management Techniques
- Coal and Its By-products
- Mercury impact and mitigation studies
- Diamond and Carbon-based Materials Research
- Pharmaceutical and Antibiotic Environmental Impacts
- Plant Surface Properties and Treatments
- GaN-based semiconductor devices and materials
- Microbial metabolism and enzyme function
- Research in Cotton Cultivation
- Allelopathy and phytotoxic interactions
- Weed Control and Herbicide Applications
- Insect Pheromone Research and Control
- Insect Resistance and Genetics
Kyungpook National University
2014-2023
Hankyong National University
2021
National Institute of Food and Drug Safety Evaluation
2019
Yonsei University
2006-2007
Hyundai Heavy Industries (South Korea)
2000-2001
Seoul National University
1994-1996
The University of Tokyo
1995
In this study, a multi-residue analysis was developed for 32 compounds, including pesticides and metabolites, in five meat products using gas chromatography-tandem mass spectrometry (GC-MS/MS). The validation of the analytical method also evaluated accordance with Codex Alimentarius guidelines. Aminopropyl (NH2), C18, florisil solid phase extraction (SPE) cartridges were used to evaluate optimize cleanup procedure tested samples prior GC-MS/MS analysis. Based on performance, C18 SPE...
(Ti1−XAlX)N coatings were deposited by plasma enhanced chemical vapor deposition (PECVD) method using a gas mixture of TiCl4, AlCl3, NH3, H2 and Ar. X-ray diffraction transmission electron microscopy used to investigate the structure coatings. They showed single phase NaCl-structure up X=0.8, while mixed NaCl type (Ti0.2Al0.8)N AlN with würtzite-structure was observed for 0.8<X<1.0. The lattice parameter changed linearly function X (d=4.241−0.197 Å) in region. Metastable...
(Ti1−xAlx)N was deposited on high-speed steel using a radio-frequency (rf) plasma-enhanced chemical vapor deposition (PECVD) process from the gas mixture of TiCl4, AlCl3, NH3, H2, and Ar. The composition coated layer could be controlled TiN to (Ti0.17Al0.83)N by ratio source gases, TiCl4 AlCl3. At same AlCl3 Al content in changed rf power employed. According x-ray diffraction transmission electron microscopy, PECVD-(Ti1−xAlx)N coating with x≤0.77 found have NaCl-type structure Ti atoms...
토양 중 잔류하는 chlorpyrifos의 오이 흡수 이행과 잔류분포를 조사하기 위하여 생장상 내 실내시험과 시설재배 포장에서의 실외시험을 실시하였다. 실내 및 실외시험 기간에 분해 반감기는 각각 25.8~73.0일과 32.4~42.3일로 비슷하였다. 실내시험 잔류량은 정식 후 15일까지 증가하다가 그 이후로 감소하는 양상을 나타내었으며 뿌리로부터 흡수된 농약의 양은 초기 처리된 절대량의 1.0~1.3% 수준이었다. 대부분은 뿌리에서 가장 많았으며 다음 줄기와 잎 순이었다. 반면에 수확된 오이열매에서 LOQ (0.02 mg/kg) 미만으로 안전한 수준이었으며 부위별 시료 분석결과, 실내시험에서의 결과와 마찬가지로 대부분의 잔류량이 검출되었다. 실외시험에서 한 개체에 chlorpyrifos는 토양에 살포된 양의 0.03~0.04%로 흡수율에 비해 30배 낮은 따라서 실제 토양환경 잔류수준은 본 시험에서 시험된 고농도(40 처리구보다 수준이므로 농산물의 생산이 가능하다고 할 수...
토양에 잔류된 농약의 작물로의 흡수 이행 양상을 조사하기 위해서 boscalid 및 chlorfenapyr를 잔류시킨 후 엇갈이 배추로 되는 정도를 조사하였다. 배추 토양 중 두 확립된 분석법을 이용하여 회수율시험을 실시한 결과 회수율은 87.5~105.2% 범위 이내이었다. boscalid의 초기잔류량은 저농도 처리구에서 2.77 mg/kg, 고농도 5.66 mg/kg이었으며 28일 경과 잔류량은 각각 0.53 1.60 mg/kg으로 초기잔류량의 71.7~81.9%가 감소하였다. 반면에 chlorfenapyr의 2.38 6.43 나타났으며, 1.36 2.91 42.9~54.8%가 배추시료는 파종 21일부터 28일까지 약 2일 간격으로 수확하여 잔류농약분석을 실시하였으며 시간경과에 따라 흡수량이 증가하였다. 흡수된 흡수량은 2.47 2.4%의 흡수율을 보였으며, 4.71 2.2%가 흡수되었다. 2.63 나타나 1.5 1.3%를 흡수하였다. 이러한 결과는 농약이 후작물로...
BACKGROUND: Uptake patterns of α-, β-isomers and sulfate metabolite endosulfan (ED) by radishes grown in treated soils with ED concentrations 2 10 mg/kg were investigated to establish soil management guidelines for ensuring the safety from residues.METHODS AND RESULTS: All samples radish plants separated into shoot root parts analyzed residues using a gas-chromatography mass spectrophotometer, results used calculate bioconcentration factor (BCF), indicating ratio between soils.During...
This study involved analysis and method validation of spirotetramat applied to two phenotypically different Korean vegetables (e.g. cabbage shallots) determine the safe pre-harvest residue limit (PHRL) comparative dissipation patterns. Two steps investigation greenhouse monitoring during crop cultivation followed by LC-MS/MS analysis. Commercial was sprayed twice with seven-day intervals according spray schedule (0, 3, 7, 10, 14, 21 days before harvest) at dose recommended Ministry Food Drug...
BACKGROUND:As the demand for strawberries increases, people are paying attention to food safety in strawberry, especially pesticide residues.To remove pesticides from various washing and processing technique households additionally required.METHODS AND RESULTS: Strawberries were washed with water, detergent, alcohol, ultrasonication processed strawberry jam.The mean reduction efficiency according solvent method was found be higher order of detergent (42.5%) > alcohol (41.7%) water (41.3%)>...
밀의 재배기간 중 살포된 살균제 fludioxonil 및 metconazole의 부위별 잔류양상을 조사하였다. 밀 metconazole (cis trans 이성질체의 합)의 잔류분석 회수율은 84.3~113.3%이었으며 변이계수는 0.1~4.7%로 나타나 잔류농약분석 기준을 만족하였다. 두 농약 모두 처리구별 수확된 짚부위에 가장 많이 잔류되었으며 가식부인 밀알에서 잔류량이 적었다. 가식부에 잔류하는 농약의 농도는 fludioxonil은 2회 3회 살포시 0.01~0.07 mg/kg, metconazole은 0.13~0.17 mg/kg로 나타났다. 침투성 농약인 보다 더 낮은 농도로 살포되었음에도 불구하고 가식부로 침투량이 많았으며 cis 이성질체가 이성질체 잔류되었다. 각 평균무게를 이용하여 한 개체 당 잔류절대량을 산출하고 분포율을 산출한 결과, 짚 부위에서 68.5~70.7%의 나타내었으며 가식부에서 분포율은 0.8% 미만이었다. Residual patterns of...
Compositionally gradient (Ti1−xAlx)N coatings were deposited by the plasma enhanced chemical vapor deposition technique using a gas mixture of TiCl4, AlCl3, NH3, H2, and Ar. The Al Ti concentrations in coated layer changed linearly with logarithms flow rate ratio AlCl3 to log(QAlCl3/QTiCl4). Since pressures TiCl4 change exponentially temperature within range where vaporizers source materials heated for deposition, could be controlled simply changing temperatures vaporizers. X-ray diffraction...
We report on the characteristics of sputter-deposited Ti1−xAlxN (TiAlN) thin films for storage node electrode barriers Pt/(BaSr)TiO3(BST)/Pt metal–insulator–metal (MIM) capacitors with a comparative study TiN films. The substrate temperature (Ts) was found to be one key factors affecting properties TiAlN films, i.e., resistivity is ∼350 μΩ cm high Ts deposition (∼450 °C) and ∼1100 low (∼100 °C). lower deposited at (450 attributed (200) texture larger grain size smaller oxygen concentration...
The biological half-life of pesticides applied on crops is the key indicator for ensuring safety agricultural products.The affected by several factors like growing conditions crop, climate, application method, and physicochemical properties pesticides.In this study, was calculated degradation rates six triazole fungicides sprayed perilla leaves were evaluated.Moreover, statistical analysis confirmed correlation between pesticides.The recoveries 84.8-104.9%,which satisfied residual pesticide...
BACKGROUND: Pesticides can persist in soil due to multiannual uses.To decrease the concerns for potential carry-over of such residues from treated during preceding crop cultivation non-target crops grown rotation, an uptake study procymidone was conducted under actual conditions Korea.METHODS AND RESULTS: Procymidone sprayed twice by foliar application with recommended and double dose according safe use guidelines Korean cabbage up 14 days before harvest.Arable land kept fallow 4 after...
Due to global climate change and poor drainage soil characteristic in paddy fields, soybeans which are one of main upland crops Korea prone get stressed by excessive moisture during cultivation. Excessive stress causes growth, yield loss, disease soybeans. In order prevent damages stress, it is important understand responses under condition. Therefore, this study investigated morphological physiological at various growth stages; V2, R1, R3, R5 whole growing period. Soybeans were planted...