Import Tolerance 설정을 위한 참다래 중 Buprofezin의 잔류성

조일규 ( Il Kyu Cho ),이경환 ( Gyeong Hwan Lee ),조우영 ( Woo Young Cho ) 한국환경농학회 2022 한국환경농학회 학술대회집 Vol.2022 No.-

The pre-harvest interval and decline pattern of buprofezin in kiwifruit have been studied using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The study has been coducted to propose import tolerance using OECD maximum residue limit (MRL) calculator for export promotion of kiwifruit to Taiwan. The limit of quantification of buprofezin showed 0.01 mg/kg in kiwifruit. The average recovery rate of buprofezin at the level of 1LOQ, 10LOQ an 100LOQ ranged from 76.0 to 100.6 % in site 1 (Gimje), 75.6 to 94.7 % in site 2 (Goheung), and 75.7 to 88.5 % in site 3 (Jangheung), respectively. Sampling was carried out 0, 7, 14, 21, 30, and 40 days after the final application of the Amitraz+buprofezin 25 (12.5+12.5)% EC (Emulsifiable Concentrate). The control samples were collected prior to application on the first day of harvest. The average residue- amount of buprofezin in the kiwifruit for three decline test represented in the range of 0.61 to 0.84 mg/kg in site 1, 0.70 to 1.19 mg/kg in site 2 and 0.54 to 1.06 mg/kg in site 3. Likely, The maximum residual amount of buprofezin in the treatment of 50 days before harvest were 0.70 mg/kg in,in kiwi field 1, 0.73 mg/kg in field 2, and 0.62 mg/kg in field 3. The unround MRL implicated 1.753 mg/kg while it was determined using OECD MRL calculator. In conclusion, the import tolerance for buprofezin in kiwifruit may be recommended at 2.0 mg/kg in Taiwan by using the OECD MRL calculator.

공동주택 지하구조물의 누수부위 성능복원용 보수기술

조일규(Cho, Il Kyu),오상근(Oh, Sang Keun) 대한건축학회 2018 建築 Vol.62 No.5

급결마이크로시멘트 및 글리시딜아크릴레이트를 복합 적용한 누수현장 보수사례

조일규 ( Cho Il-kyu ),유재형 ( Yuh Jae Hyung ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2

This technology is a water leak repair technology using composite materials of concrete structures that block leakage of structures by injecting rapid microcement into the face of underground concrete to block water and injecting flexible glycidylacrylate. Rapid micro cement system repair materials are mixed with fine fibers to improve the flexural sensitivity of the material and to form a layer that blocks stabilized water at the back of the structure by allowing rapid and tight spatial filling during injection with high cohesion The glycidylacrylate repair material can control the expansion rate, and the external stress also has the characteristic that the form of the material is not destroyed or separated, which can also be applied to vibrating induced structures that produce repetitive fatigue loads, and has an effective durability in saline, alkali, acid (chloric acid, sulfuric acid, nitric acid).

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.

생태계 유출 왕우렁이 관리를 위한 유인망 효과

조일규 ( Il Kyu Cho ),이종현 ( Jong Hyun Lee ),조우영 ( Woo Young Cho ),홍성준 ( Sung-jun Hong ),형기우 ( Gi-woo Hyoung ) 한국환경농학회 2023 한국환경농학회 학술대회집 Vol.2023 No.0

Golden apple snails have been utilized since 1992 in Korea to control weed growth in rice fields, exploiting their feeding behaviors. However, these snails have recently begun overwintering in the southern parts of Korea due to climate change, causing harm. In 2007, the Ministry of Environment categorized the golden apple snails as a second-class organism for ecological control. This study aims to develop an efficient trapping technique employing baited traps to eradicate the snails released into the surrounding ecosystems. The experiments were conducted in rice fields, agricultural reservoirs and freshwater lakes. The findings revealed that larger traps attracted more snails in small streams and lakes, although their effectiveness in rice fields and lakes was limited. Comparing various trap types, shrimp nets outperformed funnel traps in capturing golden apple snails, including a significant number measuring over 1 cm. Papaya leaves proved to be the most effective attractant for both shrimp nets and funnel traps, followed by potatoes, menthol-containing fish bait and papaya fruit. In the cultivation environment experiments, large funnel traps with papaya leaves captured 192 snails in 7 days, while traps with potatoes only caught 101 snails. This indicates that papaya leaves had roughly double the attraction effect compared to potatoes. However, the attraction effect decreased when focusing on snail capture in rice fields, their natural habitat, compared to experiments conducted in other areas. In the subsequent year, after applying pesticides to the snails on April 24, 2023, baited traps were installed on May 3, and after 6 days, on May 9, increased attraction was observed in large funnel traps with potatoes, melons, watermelons, papaya leaves and oriental melons. The results recommend installing large funnel traps in rice fields, agricultural reservoirs, drainage channels, and suitable locations, emphasizing snail capture and removal methods. Potatoes, melons and watermelons are recommended as attractants due to their ease of use for farmers.

왕우렁이 월동 방제 친환경농업자재 효과

조일규 ( Il Kyu Cho ),서민경 ( Min-kyoung Seo ),양현주 ( Hyun-joo Yang ),장소영 ( So-young Jang ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-

왕우렁이(golden apple snails)는 1983년 식용목적으로 국내에 도입되었다가 1992년부터 왕우렁이의 섭식 특성을 활용하여 벼농사의 논 잡초 방제용으로 사용되기 시작하였다. 국내에 유입된 종은 Pomacea canaliculata 로 남아메리카가 원산지이며 국내에 서식하고 있는 토종우렁이와는 외형, 먹이, 번식 등에서 확연한 차이가 있다. 토종우렁이가 새끼로 번식하는 것에 비해 알로 번식하는 왕우렁이는 원산지인 열대지방에서는 왕우렁이가 벼의 해충으로 인식되고 있고, 필리핀, 대만 등 동남아시아 및 일본에서 벼농사의 심각한 피해를 주기 때문에 IUCN(세계자연보전 연맹)에서는 세계 100대 침입 외래종으로 분류하고 있다. 기후 온난화로 인해 국내에서도 왕우렁이가 월동을 하게 되면서 남부지역에 피해를 끼침으로 환경부는 2007년 왕우렁이를 법정 생태계 위해 생물 2등급으로 분류하고 있다. 본 시험에서는 왕우렁이 월동 방지를 위하여 친환경농업자재 5가지 제품(제품 1: 석회 유황, 제품 2: 황토 및 유황, 제품 3: 제충국 함유, 제품 4: 마트린 함유 제품 5: Pseudomonas chlorohaphis, O6)을 1000배, 2000배로 각각 희석하여 처리 후 시간대별로 활동성을 확인하였다. 24시간 이후 왕우렁이의 폐사 여부를 확인하여 방제률을 확인하였는데, 제품 3이 가장 우수한 왕우렁이 방제 효과를 보였으며, 그 다음으로 제품 1, 2, 4가 유사한 방제력을 나타냈으나 제품 5는 방제 효과가 없는 것으로 나타났는데 이는 Pseudomonas chlorohaphis가 왕우렁이 방제에 영향을 주지 않는 것으로 판단된다.

농업용 저수지에서 Bisphenol A의 잔류실태조사

조일규 ( Il Kyu Cho ),남효송 ( Hyo Song Nam ),전용배 ( Yongbae Jeon ),박준성 ( Jun Sung Park ),나태웅 ( Tae Wong Na ),김백종 ( Back Jong Kim ),( Eunsung Kan ) 한국환경농학회 2016 한국환경농학회지 Vol.35 No.4

BACKGROUND: Significant amount of bisphenol A has been released from the manufacturing process of plastics, epoxy resins, dental material and flame retardants. Bisphenol A has been detected at trace levels in wastewater, surface water, landfill leachate and drinking water. However, the residual survey of bisphenol A has not been performed in agricultural reservoir beside agricultural environment cultivating crops. This study was conducted to monitor the residual bisphenol A in national agricultural reservoirs and understand a level of contamination of bisphenol A in the agricultural environment in Korea. METHODS AND RESULTS: The water and water sediment were collected at agricultural reservoirs in Chungnam, Chungbuk, Kyunggi, Jeonnam, Jeonbuk, Kyungnam and Kyungbuk province. Bisphenol A was analyzed by the LC-MS/MS with triple quad 4500. The recovery of water and water sediment in the agricultural reservoirs showed the level of 95.7~97.2% and 91.5 ~100.3%, respectively. CONCLUSION: Bisphenol A was detected at the level of 0.05 μg/L~0.18 μg/L and 0.1 μg/kg~34 μg/kg in water and water sediment of the reservoirs, respectively. Based on the results, the residue of bisphenol A will be tried in the crops surrounding these agricultural reservoirs where bisphenol A detected above 10 μg/kg of bisphenol A.

폴리 아크릴 레진의 누수 보수 평가에 관한 연구

조일규 ( Cho Il-kyu ),김근허 ( Kim Keun-hur ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2

In this study, various materials such as epoxy material, urethane material, cement material, and acrylic material are used to solve the water leakage occurring in underground structures. However, in the reality that the durability is insufficient and the effect is insufficient, it is aimed to improve the repairing effect by using cement and acrylics in combination. As a first study, we tried to verify the performance of improve the performance by checking the product properties according to the composition ratio of polyacrylic resin. Polyacrylic resin is evaluated in three different composition ratios. When the material is selected for polyacrylic resin, it is applied to the field to understand the maintenance effect and durability

급결 마이크로 시멘트의 성능평가를 통한 차수층 활용성에 관한 연구

조일규 ( Cho Il-kyu ),유재형 ( Yuh Jae Hyung ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1

In this study, various materials such as epoxy material, urethane material, cement material, and acrylic material are used to solve the water leakage occurring in underground structures. However, in the reality that the durability is insufficient and the effect is insufficient, it is aimed to improve the repairing effect by using cement and acrylics n combination. As a first study, we tried to verify the performance of rapid micro cement and cement paste and to improve the performance by checking the product properties. Three types of micro cement are evaluated. Three types of micro cement are used: fiber inclusion, fiber unfolding, and cement paste. When the material is selected for micro cement, it is applied to the field to understand the maintenance effect and durability.

폴리아크릴 레진의 누수보수재 성능평가

조일규 ( Cho Il-kyu ),유재형 ( Yuh Jae Hyung ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2

In this study, various materials such as epoxy material, urethane material, cement material, and acrylic material are used to solve the water leakage occurring in underground structures. However, in the reality that the durability is insufficient and the effect is insufficient, it is aimed to improve the repairing effect by using acrylics. As a second study, it is confirmed that leachate can be used as a repair material by considering long time under water stability, elongation range test, fatigue resistance test, tube stability test, damage recovery performance ana temperature stability considering leakage environment for polyacrylate. In addition, this material is applied to Expansion Joint to perform leakage repair, and to verify the effect of repairing leakage by monitoring and visual observation of concrete humidification.