제1회 한·일 전기기술교류회의 참관기

설재웅,Seol, Jae-Ung 대한전기협회 2006 전기저널 Vol.359 No.-

Diquat Dibromide 토양광분해성

조일규 ( Il Kyu Cho ),설재웅 ( Jae Ung Seol ),오영곤 ( Young Goun Oh ),김지명 ( Ji Myung Kim ),서민경 ( Min Kyeong Shu ),윤중식 ( Jung-sik Yoon ) 한국환경농학회 2018 한국환경농학회 학술대회집 Vol.2018 No.-

Diquat dibromide (1,1'-ethylene-2,2'-bipyridyldiylium dibromide) causes injury to only the parts of the plant to which it is applied. However, it may be fatal to humans if swallowed and inhaled even though it is used to desiccate potato vines and seed crops. Photodegradation of diquat dibromide can be an important factor to remove it in environment. The aim of this study is to understand photodegradation pattern of diquat dibromide in the soils. The photodegradation trial has been performed in compliance with the method (OPPTS 835.2410 photodegradation on soil EPA fate, transport and transformation test guidelines) with the upland soils of Yongin and Chungju in Korea. This study indicated that the main photolytic-metabolites of TOPPS and diquat monopyridone were detected below the detection of limit (0.01 mg/kg) by using the LC-TriQ-MS/MS under the 300 nm of artificial light condition. The half-life (DT50) of diquat dibromide during the soil photolysis showed 43.9 and 22.4 days at the Yongin-upland soil that was applied with 35 mg/kg and 90 mg/kg of diquat dibromide, repectively. On the other hand, the DT50 of diquat dibromode in the Chungju-upland soil were 23.3 and 25.3 days at the 35 mg/kg and the 90 mg/kg of diquat dibromide-treated soil, respectively.

90% Green TD의 수중 잔류 특성

조일규 ( Il Kyu Cho ),설재웅 ( Jae Ung Seol ),오영곤,김지명 ( Ji Myung Kim ),이동기 ( Dong Gi Lee ),설기하 ( Gi Ha Seol ) 한국환경농학회 2019 한국환경농학회 학술대회집 Vol.2019 No.-

수생태계 질소와 인이 풍부한 부영양 상태에서 유해조류의 대량발생이 빈번해지고 피해가 커지고 있어 이에 대한 친환경인 효율적 방제법 개발이 절실히 요구되고 있다. 본 연구에서 환경 친화적이고 선택적 조류 방지제로 높은 구제효율과 경제성으로 대량 발생한 남조류(Microcystis aeruginosa)등 유해조류를 효과적으로 방제할 수 있는 Green TD(90% 수용액)의 수생태계 영향평가 위해 Green TD{Cyclopentyl-(3,4-dichloro-benzyl)-amine} 잔류분석법을 개발하였고 수중 잔류성시험(농촌진흥청고시 제2017-21호, 별표 14-2)을 수행하였다. 시험약제처리량은 25 g/10 a(0.023kg a.i./10 a), 50 g/10 a(0.045 kg a.i./10 a)으로 2개 농도로 온실포트 실험을 진행하였다. 시료채취시기는 처리전, 0일(처리후 2시간),1일, 3일, 5일, 7일, 14일, 21일로 채취하였다. GreenTD의 수중 잔류 양상을 효과적으로 구명하기 위해 수중 잔류분석법을 개발 하였으며, GreenTD의 잔류량을 Shiseido Capcellpak UG120 C18 컬럼을 사용하여 Shmadzu LC-2040C MT Plus(Japan)으로 분석하였다. 물 시료는 감압농축하고 건고물을 물에 용해하여 HPLC-DAD(UV 230 nm)로 분석하였다. 토양 시료는 6N 황산으로 가수분해하고 원심분리한 다음 6N Sodium hydroxide로 알칼리화하고 Dichloromethane으로 분배한 후 감압농축하여 건고물을 물에 용해하여 HPLC-DAD(UV 230nm)로 분석하였다. 물 및 토양 중 GreenTD의 회수율은 각각 76.3 ~ 88.7 %(CV=6.4 %), 74.9 ~79.0 %(CV=1.9 %)이었고, 분석법의 검출한계는 각각 0.01 mg/kg이었다. Green TD 수중 반감기는 25g/10a 및 50g/10a 처리구에서 각각 4.5일와 3.6일이였다. 이 결과는 “수중 반감기가 7일 이하”로 농약의 수중 잔류시험성적 인정범위에 적합한 안전한 수준이였다. 시험약제 처리 21일 후 수중에서 Green TD의 잔류량은 25g/10a 및 50g/10a 처리구 모두 평균 분석법의 검출한계(0.01mg/L)이하로 나타났으며, 토양에서의 Green TD의 잔류량은 25g/10a 처리구에서는 0.03 ~ 0.47mg/kg 이었고 50g/10a 처리구에서는 0.05 ~ 0.92 mg/kg 수준이었다.

Import Tolerance 설정을 위한 꽃받침포함 딸기 중 Flonicamid와 대사산물의 잔류성

오영곤 ( Young Goun Oh ),정윤수 ( Yun-Su Jeong ),이동기 ( Dong-gi Lee ),설재웅 ( Jae Ung Seol ),김지명 ( Ji Myung Kim ),이승현 ( Seung-hyun Lee ),조일규 ( Il Kyu Cho ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-

Pre-harvest interval and decline pattern of flonicamid, TFNG and TFNA were determined in strawberry with calyx using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The study was carried out to propose import tolerance for export promotion of strawberry to Taiwan by using OECD maximum residue limit (MRL) calculator. The residue field trials for flonicamid (50%, SG, insecticide) were carried out as decline tests in the three independent sites to cultivate strawberry. The flonicamid (50%, SG) of test substance was diluted 10,000 times and the 0.00764 kg a.i./10 a of flonicamid 50% SG was applied for the sites two times at 7-day intervals. Sampling was carried out 0, 1, 3, 5, 7, 14, 21, 28, 35 and 45 days after the final application of flonicamid (50%, SG), and untreated control samples were collected prior to the sampling of treated plots. The residual amount of flonicamid included with TFNG and TFNA presented 0.06∼1.40 mg/kg in site 1 (Sacheon), 0.06∼0.82 mg/kg in site 2 (Gokseong) and 0.18∼1.15 mg/kg in site 3 (Nonsan), respectively, in the strawberry with calyx for three decline test. In cThe import tolerance of flonicamid for strawberry with calyx may be recommended at 3.0 mg/kg in Taiwan by the OECD MRL calculator.

글로브 후단에 설치된 오리피스 유량계 내 유동특성에 관한 실험 및 수치해석 연구

오철호(Chul-ho Oh),윤병조(Byong-jo Yun),박진영(Jin-yeong Bak),설재웅(Jae-ung Seol) 한국유체기계학회 2017 유체기계 연구개발 발표회 논문집 Vol.2017 No.12

꽃받침포함 딸기 중 Thiacloprid와 Flufenoxuron의 잔류연구

정윤수 ( Yun-Su Jeong ),오영곤 ( Young Goun Oh ),이동기 ( Dong-gi Lee ),설재웅 ( Jae Ung Seol ),김지명 ( Ji Myung Kim ),김원일 ( Won-il Kim ),조일규 ( Il Kyu Cho ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-

The persistence pattern of thiacloprid and flufenoxuron were determined in strawberry with calyx using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The study was carried out to propose import tolerance using OECD maximum residue limit (MRL) calculator for export promotion of strawberry with calyx to Taiwan. The residue trials of thiacloprid (10% SC) and flufenoxuron (5% DC) were conducted as decline tests at three independent sites for strawberry. Excellent linearity observed for all of the analytes with determination coefficient (R²)≥0.99. The both LOQ (limit of quantification) of thiacloprid and flufenoxuron were 0.01 mg/kg in strawberry. The recovery rate of thiacloprid presented 76.8∼ 101.4 % in site 1, 83.9 ∼108.6 % in site 2 and 76.1∼101.9 % in site 3, respectively. The recovery rate of flufenoxuron showed 80.2∼98.7 % in site 1, 99.8∼117.4 % in site 2 and 81.1∼ 91.7 % in site 3, respectively. The residual amount of thiacloprid in the strawberry for three decline test were found in the range of 0.44 to 1.11 mg/kg in site 1 (Sacheon), 0.17 to 0.38 mg/kg in site 2 (Gokseong) and 0.19 to 0.39 mg/kg in site 3 (Nonsan). The residual amount of flufenoxuron in the strawberry for three decline test were found in the range of 0.34 to 1.50 mg/kg in site 1 (Sacheon), 0.20 to 0.48 mg/kg in site 2 (Gokseong) and 0.28 to 0.58 mg/kg in site 3 (Nonsan). In conclusion, the both import tolerance for thiacloprid and flufenoxuron in strawberry with calyx were proposed to 2.0 mg/kg in Taiwan.

파프리카 중 tetraconazde의 수입 농산물 잔류허용기준 설정

조일규 ( Ii Kyu Cho ),오영곤 ( Young Gon Oh ),무스픽 ( Musfiqur Rahman ),설재웅 ( Jae Ung Seol ),이동기 ( Dong-gi Lee ),김지명 ( Ji Myung Kim ),정윤수 ( Yun Soo Jeong ) 한국환경농학회 2020 한국환경농학회 학술대회집 Vol.2020 No.-

The import tolerance of tetraconazole in paprika was proposed using OECD Maximum Residue Limit (MRL) calculator after conducting three different field trials to promote export of it to Taiwan. Pre-harvest interval (PHI) of residual pattern and degradation dynamic of tetraconazole in paprika were determined using ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Samples were extracted with acetonitrile and a mixture of salts and dilution was performed for purification. A six point matrix matched calibration curve was constructed which provided excellent linearity with coefficient of determination (R2) ≥ 0.999. The quantification limits were 0.001 mg/kg. The method was validated in quintuplicate at three different concentrations resulted acceptable recovery ranging from 89.9~104.6% with relative standard deviation (RSD) ≤ 1.2% among the three filed sites. The developed method was applied to the field treated sample harvested at different intervals. In PHI trial, the tetraconazole residues were ranged 0.28-0.99 mg/kg in the field site 1 (Hwasun), 0.44 ~ 0.97 mg/kg in the field site 2 (Jinju), and 0.15 ~ 0.51 mg/kg in the field site 3 (Nomwon). Whereas, in the degradation trial, the observed residues were 0.07 ~ 0.53 mg/kg in the field site 1 and 0.14 ~ 0.29 mg/kg in the field site 3, Consequently, the import tolerance of tetraconazole in paprika using OECD MRL calculator was proposed to 2.0 mg/kg, which is different as the MRL(1.0 mg/kg) for pimento established by Republic of Korea. In conclusion, the residue study supported to propose 2.0 mg/kg as a MRL of tetraconazole for paprika.

사토양와 양토 재배 후작물 중 Diquat dibromide의 약해와 전이

조일규 ( Il Kyu Cho ),양해룡 ( Hae-Ryong Yang ),설재웅 ( Jae Ung Seol ),오영곤 ( Young Goun Oh ),이동기 ( Dong-gi Lee ),김지명 ( Ji Myung Kim ),김원일 ( Won-il Kim ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-

Diquat dibromide (1,1’-ethylene-2,2’-bipyridyldiylium dibromide) is known as a fast-acting nonselective herbicide and plant growth regulator. This agrochemical causes injury to the parts of the plant to which it is applied. However, it may be fatal to humans if swallowed and inhaled even though it is used to desiccate potato vines and seed crops. This study was carried out to understand the safety of the following crops such as pepper, radish, lettuce and corn through phytotoxicity and residual evaluation in the unintentional contamination of the higher residual diquat dibromide. The diquat dibromide was analyzed by using the LC-TriQ-MS/MS. The diquat dibromide was determined after 30 days of crop cultivation in soil which had been applied with 35 and 90 mg/kg of diquat dibromide. The diquat dibromide remained 26.3∼28.1 and 70.9∼75.8 mg/kg at the 35 mg/kg and 90 mg/kg of diquat dibromide-treated soil, respectively. This result indicated that diquat dibromide did not convert to other metabolites and resided mostly in the soil during crop cultivation even though it was partially decomposed. In addition, the diquat dibromide were found around 0.01 mg/kg and below the detection of limit (0.01 mg/kg) in the 47 day-elapsed pepper and radish as well as 30 day-elapsed lettuce and corn cultivating in sandy loam and loam soil which were treated with 90 mg/kg of diquat dibromide.