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Arsenic Toxicity of Rice and its Interrelation with Zinc
오영탁,죠유 ?베리,Oh, Yong Taeg,Sedberry, J.E. Jr. 한국토양비료학회 1974 한국토양비료학회지 Vol.7 No.1
수도에 대한 비소의 피해 및 아연-비소간의 교호작용을 온실실험으로 조사하였다. 비소 피해의 증세는 수도를 시들게 하는 것이었으며 지상부 및 지하부의 생장을 감소시키었다. 비소 피해는 1 ppm의 비소 처리구에서도 관찰되었다. 아연의 시용은 수도의 비소흡수를 억제하지는 못했지만 비소 피해를 완화시키었다. 반면 처리된 비소는 아연의 흡수를 감소시키었으며, 따라서 아연시용의 효과는 비소피해에 의한 아연흡수 감소를 보상하였기 때문이다. 이 시험중 공시토양인 Crowley SiL의 비교적 높은 토양반응에 기인하여 철 결핍증이 관찰되었다. Arsenic toxicity of rice and the interaction between As and Zn were studied in a greenhouse experiment. The symptom of As toxicity of rice was the growth retardation of tops and roots accompanied by wilting. The toxicity was observed even on the 1 ppm arsenic treated soils. Zinc applictiaon reduced As toxicity but it did not depress the As uptake by rice, while As reduced the Zn uptake by rice. There-fore, the applied Zn apparantly conpensated for the depressed Zn up-take due to As toxicity. Iron deficiency was observed during the experiment, and this was probably due to the relatively high soil reaction, pH of the Crowley silt loam.
비교란 Lysimeter를 활용한 논 토양에서의 살충제 Chlorpyrifos-methyl의 용탈특성
오영탁 ( Youngtak Oh ),임성진 ( Sungjin Lim ),박정훤 ( Jeonghwon Park ),주형곤 ( Hyeonggon Joo ),이민호 ( Minho Lee ),윤효인 ( Hyoin Yoon ),최근형 ( Geunhyoung Choi ),류송희 ( Songhee Ryu ),박병준 ( Byungjun Park ) 한국환경농학회 2018 한국환경농학회 학술대회집 Vol.2018 No.-
This study was conducted to investigate the leaching characteristics of insecticide chlorpyrifos-methyl in paddy soil using undisturbed lysimeter. Soil horizons of sandy loam, loam, and silty clay loam lysimeter were composed of 6, 6, and 5, and clay contents were ranged from 53.1-63.2, 40.2-47.7, and 32.6-39.2 %, respectively. Bulk densities of each lysimeter were 1.38, 1.30, and 1.35 Mg/m3, respectively. Chlropyrifos-methyl was treated to each lysimeter at 15 days after rice planting, and water was supplied according to rice cultivation method. Pore volumes of sandy loam, loam, and silty clay loam lysimeter were calculated to 718.87, 764.15, and 735.85 L, and pore volume numbers of supplied water for rice cultivation were 0.98, 1.08, and 0.24, respectively. Movement of chlorpyrifos-methyl in each lysimeter was investigated through the residue of it in 30, 55, 85, and 125 cm soil water from topsoil and leaching water. Gas chromatography (GC) was used for chlorpyrifos-methyl analysis in water sample. Recovery and limit of quantitation (LOQ) of chlorpyrifos-methyl in water were 112.1-115.5% and 3 μg/L. Changes of moisture tension, humidity, and temperature in sandy loam, loam, and silty clay loam lysimeter was not significantly different during experiment period. Weight of silty clay loam lysimeter was higher than other lysimeter because of less leaching. Leaching volume of sandy loam, loam, and silty clay loam lysimeter were 705.9, 828.7, and 174.5 L, respectively. Total leaching content of chlorpyrifos-methyl (treatment content 770.57 mg) during experiment period in sandy loam, loam, and silty clay loam lysimeter were 0, 0, and 0.03 mg, respectively. These results showed that the movement of chlorpyrifos-methyl in sandy loam, loam, and silty clay loam paddy soil was very low.
오영탁(Yungtak Oh),한승완(Seungwan Han) 한국방재안전학회 2021 한국방재안전학회 논문집 Vol.14 No.2
본 기술은 기존의 빗물받이 및 도시형수로 시스템의 대체 가능한 기술로서 적용시 빗물은 빠르게 투수됨으로써 도시홍수를 저감할 수 있는 기술이다. 강우시 인도 방향의 제1 수로 공간으로 유입되는 빗물은 담배꽁초 등의 쓰레기는 유입되지 않고, 채움재를 통해 미세먼지 등의 오염물질을 감소시킨 후 지하로 투수시킬 수 있다. 제2 수로 공간으로 유입되는 빗물은 유속을 떨어뜨려 임시로 저류하였다가 배수관으로 배수시킴으로써, 배수관에서의 병목현상을 방지할 수 있는 도시형 수로 시스템 및 이의 시공방법에 관한 것으로 이를 통해 도시홍수 및 미세먼지 저감에 기여할 수 있을 것이다. This technology is to let rainwater flow into a waterway that is located side gutter of a street with blocking garbage including cigarette butts at the same time. The first waterway is located beside the sidewalk and it enhances the water circulation in a city. This waterway is filled with aggregates and filter media, which removes fine dust that is washed out of the street and let water flow down to the earth. The second waterway is located beside the street and it retains rainwater temporarily with decreasing its flow speed. The second waterway shall reduce flooding damages by avoiding bottleneck situation in the street inlets and storm water pipelines which is the main causation of flooding in a city.
오영탁 ( Youngtak Oh ),임성진 ( Sungjin Lim ),구명화 ( Myounghwa Ku ),주형곤 ( Hyeonggon Joo ),이민호 ( Minho Lee ),윤효인 ( Hyoin Yoon ),최근형 ( Geunhyoung Choi ),류송희 ( Songhee Ryu ),박병준 ( Byungjun Park ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
This study was conducted to develop the simultaneous analysis of veterinary pharmaceuticals (VPs) in rice straw. The method for VPs in rice straw was developed and validated by LC-QTOF-MS. The method was established using solid phase extraction (SPE) cartridges. Efficiency of cartridges was tested in view of recovery and relative standard deviation (RSD). Hydrophilic lipophilic balance (HLB) cartridge was showed the higher result than that of tested other SPE cartridges. Recovery and limit of quantitation (LOQ) of tested 9 VPs in rice straw were 72.0-90.4% and 0.076-7.6 μg/L, respectively. The precision was reliable since RSD percentage (1.7-4.6%) was below 20, which was the normal percent value. The results showed that the developed method might be used the monitoring of VPs in rice straw.
나사 풀림 방지를 위한 걸림턱 구조의 와셔 개발 및 성능 비교
오영탁(Young-Tak Oh),김기대(Gi-Dae Kim) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.8
In this study, hole-boss locking washers were developed to prevent vibrational loosening, and a benchmark test was conducted to compare these washers with existing wedge locking washers, which are imported and high-priced. The developed washers consist of an upper washer with bosses and a lower washer with holes, and the bosses are caught in the holes so that the bolt is not loosened. Additionally, the top side of the upper washer and the underside of the lower washer have small wedges perpendicular to the direction of the bolt loosening, suppressing slips. A test by the Korea Test Laboratory indicated that the ratio of the loosening torque to the joining torque is greater than 70%, confirming that the developed washers have a sufficiently high anti-loosening performance. A Junker test apparatus was manufactured for the testing of vibrational loosening and a test comparison between the proposed washers and the existing wedge locking washers shows that the proposed washers have a slower reduction in the clamping force and a higher loosening-resistance in a vibrational circumstance compared with the wedge locking washers. These results indicate that the developed washers demonstrate a high performance and boast price competitiveness.