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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.
Selective and Regenerative Carbon Dioxide Capture by Highly Polarizing Porous Carbon Nitride
오영탁 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Energy efficient CO<sub>2</sub> capture is a stringent demand for green and sustainable energy supply. Strong adsorption is desirable for high capacity and selective capture at ambient condition, but unfavorable for regeneration of adsorbents by simple pressure control process. Here we present highly regenerative and selective CO<sub>2</sub> capture by carbon nitrides functionalized porous reduced graphene oxide aerogel surface. The resultant structure demonstrate large CO<sub>2</sub> adsorption capacity at ambient condition (0.43 mmol g<sup>-1</sup>) and high CO<sub>2</sub> selectivity against N<sub>2</sub>, yet retains regenerability to desorb 98% CO<sub>2</sub> by simple pressure swing. This work identifies a customized route to reversible gas capture using metal-free, two dimensional carbonaceous materials, which can be extended to other useful applications.
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.