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안기창(Ki-Chang Ahn),경기성(Kee-Sung Kyung),이재구(Jae-Koo Lee) 한국농약과학회 2000 농약과학회지 Vol.4 No.4
The leaching behaviour of quinclorac was elucidated using soil columns. On top of each glass column packed with a rice paddy soil up to the 30 ㎝ height were applied three different treatments of [¹⁴C]quinclorac: quinclorac only (T-l), quindorac adsorbed onto active carbon (T-2), and quinclorac adsorbed onto a mixture of active carbon and Ca(OH)₂ (T-3). Half of the columns were planted with rice plants for 17 weeks and half of them unplanted for comparison. Average amounts of ¹⁴C-activity percolated from the soil columns without rice plants in T-1, T-2, and T-3 were 81.1%, 27.8% and 48.0%, respectively, of the originally applied ¹⁴C, whereas those with rice plants grown were 36.8%, 9.6% and 11.0%, respectively, indicating that the leaching of [¹⁴C]quinclorac was significantly affected by vegetation and by treatment with the adsorbents. The bioavailability of the herbicide to rice plants in T-1, T-2, and T-3 were 13.6%, 11.0% and 13.9%, respectively. The residue levels of quinclorac in the edible part of rice grains would be far less than the maximum residue limit (MRL, 0.5 ppm). After the leaching, the amounts of ¹⁴C remaining in soil in with rice planting T-1, T-2, and T-3 were 36.3%, 73.7%, and 61.8%, whereas those without rice planting were 19.7%, 71.1%, and 52.3%, respectively. The balance sheets indicate that [¹⁴C]quinclorac translocated to rice shoots would be lost by volatilization and/ or in other ways in T-1 and T-3. The ¹⁴C-activity partitioned into the aqueous phase of the leachates collected from all treatments was less than 7% of the total, but it increased gradually with time in the case of rice growing, suggesting the formation of some polar degradation products.
ELISA에 의한 유기인계 살충제 Acephate 잔류물 분석법 개발
이재구(Jae Koo Lee),안기창(Ki Chang Ahn),Donald W. Stoutamire,Shirley J. Gee,Bruce D. Hammock 한국농약과학회 2001 농약과학회지 Vol.5 No.2
A competitive indirect enzyme-linked immunosorbent assay (ci ELISA) for the organophosphorus insecticide acephate, O,S-dimethyl acetylphosphoramidothioate, was developed using a polyclonal antibody. Three different haptens mimicking the analyte and containing hexanoic acid moiety as a linker were synthesized, and then conjugated with the carrier proteins bovine serum albumin and keyhole limpet hemocyanin by the N-hydroxysuccinimide active ester method. Polyclonal antibodies raised against hapten-KLH conjugates in rabbits and the hapten-BSA conjugates as coating antigens were screened and selected for the assay in the homologous and/or heterologous ELISA system. The effects of various assay conditions, including blocking reagents, detergent content, organic solvents, pH, and preincubation of the mixture of the polydonal antibody and the analyte on the sensitivity were evaluated. The IC?? value of acephate of 110 ng/㎖ was obtained in an optimized heterologous system using hapten-3-BSA as a coating antigen and a polyclonal antibody 8377, showing the detection range of 10-1000 ng/㎖ and the lowest detection limit of 4 ng/㎖. The cross-reactivities of the structurally related insecticides, including methamidophos were less than 0.02%. These results indicate that the ELISA could be a convenient and alternative tool for monitoring acephate residues in agricultural products and environmental samples.
박주형(Ju Hyoung Park),안기창(Ki Chang Ahn),이재구(Jae Koo Lee) 한국환경농학회 2000 한국환경농학회지 Vol.19 No.4
For the artificial removal of air pollutants such as pesticides, environmental toxicants, and pathogenic microorganisms in the greenhouse or the living environment, the accelerated photodegradation and the biocidal effects of some photosensitizers (PS)/photocatalysts (PC) were tested under the sunlight and/or artificial light. The selected photosensitizers/photocatalysts included the semiconductors (PC-1 and PC-2), the oxidizers (PC-3, PC-4, PC-5 and PC-6), the aromatic ketone (PS-7) and the aromatic amine (PS-8). In the case of dichlorvos, all the photocatalysts selected showed more accelerated photodegradation than the control without photocatalysts under both the sunlight and artificial light. Whereas, only the photocatalyst PC-1 accelerated the degradation of methyl tert-butyl ether about 17 times more than the control under both the sunlight and artificial light. Procymidone was much more degraded by the photosensitizer PS-8 and the two photocatalysts (PC-1, PC-6) than by PS-7. In the preliminary experiments to diminish the population of the microorganisms in the air, the photocatalyst PC-1 added to the suspensions of Pseudomonas putida, Phytophthora capsici, and Salmonella typhimurium obviously inhibited the microbial growth under the artificial light. The photocatalyst PC-1 showed a bactericidal activity against Salmonella typhimurium spread on the nutrient broth agar medium. These results suggest that the photosensitizers/photocatalysis under the light can remove some air pollutants and hence they can be used to reduce the exposure of the workers in the horticultural facilities and/or the public in the environment to the harmful pollutants.
Fate of the herbicide bensulfuron-methyl in a soil/rice plant microecosystem
Jae Koo Lee(이재구),F. Fuhr,Jeong Wook Kwon(권정욱),Ki Chang Ahn(안기창),Ju Hyoung Park(박주형),Yong Pil Lee(이용필) 한국농약과학회 2004 농약과학회지 Vol.8 No.4
In order to elucidate the behavior of bensulfuron-methyl, a sulfonylurea herbicide, in a soil/plant microecosystem, rice plants (Oryza sativa L.) were grown for 12 weeks in the specially made stainless steel pots (17 ㎝ I.D. × 10 ㎝ H.) containing two different paddy soils treated with fresh and 13-week-aged residues of [phenyl-¹⁴C]bensulfuron-methyl, respectively. During the aging period, the mineralization to ¹⁴CO₂ from soil A (OM, 3.59%; CEC, 7.65 c㏖? ㎏?¹, texture, sandy clay loam) and B (OM, 1.62%; CEC, 4.51 c㏖? ㎏?¹; texture, sandy loam) amounted to 6.79 and 10.15% of the originally applied [¹⁴C]bensulfuron-methyl, respectively. The amounts of ¹⁴CO₂ evolved from the soils with fresh residues were higher than those from the soils with aged residues. At harvest after l2-week growing, ¹⁴C-radioactivity absorbed and translocated into rice plants from soils A and B containing fresh residues of bensulfuron-methyl was 1.53 and 4.40%, while 4.04 and 6.37% in the two soils containing aged residues, respectively. Irrespective of aging and soil type, the ¹⁴C-radioactivity remaining in soil ranged from 80.41 to 98.87% of the originally applied [¹⁴C]bensulfuron-methyl. The solvent extractability of the soils was 39.25 ~ 70.39%, showing the big differences among the treatments. Most of the nonextractable soil-bound residues of [¹⁴C]bensulfuron-methyl were incorporated into the fulvic acid fraction(61.32~76.45%). Comparing the microbial activity of the soils with rice plants grown with that of the soils without them, the former was 1.6~3.0 times higher than the latter. However, it did not correlate with the ¹⁴CO₂ evolution.
김성민(Sung Min Kim),권정욱(Jeong Wook Kwon),안기창(Ki Chang Ahn),조일규(Il Kyu Cho),경기성(Kee Sung Kyung),이재구(Jae Koo Lee) 한국농약과학회 2003 농약과학회지 Vol.7 No.3
The leaching behaviour of [aniline-¹⁴C]mefenacet in soil was investigated using glass columns (5 ㎝ I.D. × 30 ㎝ H.) packed with two types of soils with different physicochemical properties. ¹⁴C-Mefenacet (8.33 kBq) and mefenacet (in total, 1.05 ㎎/㎏) were treated onto soil columns and rice plants (Oryza sativa L.) were grown for 17 weeks on these columns. Leachates from the columns were collected at the rate of 122.5 mL per week. ¹⁴C-Activities leached from soil A (OM, 3.1 %; CEC, 86 m㏖(+)/㎏; texture, loam) columns with and without rice plants were 1.95 and 4.19% of the originally applied, whereas those from soil B (OM, 1.3%; CEC, 71 m㏖(+)/㎏; texture, loam) were 2.69 and 7.05%, respectively. These results indicated that larger amounts of ¹⁴C were percolated from soil B with less organic matter and from the columns without vegetation. ¹⁴C-Activities absorbed by rice plants from soil A and B were 8.95 and 8.47%, respectively, most of which remained in the root and shoot excluding unhulled grains and ears without grains. 62~73% of the originally applied ¹⁴C remained in the depth of 0~5 ㎝ in soil. The mass balance indicated that the losses by volatilization and/or mineralization amounted to 3.4~9.2% of the originally applied. ¹⁴C-Radioactivities in the aqueous phase of the leachates ranged from 59.4 to 97.7% of the radioactivities in leachates, showing the fast transformation of mefenacet to the polar metabolites.