• Proceedings of the Korean Environmental Sciences Society Conference
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• 2003.11b
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• pp.381-383
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• 2003

유기염소계농약류 25종을 분석한 결과 HCHs(4종, endosulfan(2종), octachlorostyrene은 모든 시료에서 검출되지 않았으며 trans-nonachlor, heptachlor는 각각 한 지점의 붕어에서 검출되었고 나머지는 검출되지 않았다. Chlordane의 경우 두 이성질체가 한 지점의 붕어에서 검출되었고, DDT는 6개 이성질체 중 p,p’-DDT와 p,p’-DDD가 한 지점의 붕어에서 검출되었으며 o,p’-DDT는 한 지점의 황소개구리에서 검출되었다. 그 외의 이성질체는 모든 시료에서 검출되지 않았다.

• Proceedings of the Korean Society of Life Science Conference
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• 2002.03a
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• pp.43-43
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• 2002

• Journal of Plant Biology
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• v.20 no.1
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• pp.53-57
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• 1977

The appearence of organochlorine pesticide residues in some marinealgae, e.g. Sargassum thunbergii, Ulva pertusa, Codium fragile, and Enteromorpha linza, collected from various sites of Kwang Yang Bay, southern coast of Korea, was surveyed through the year from May 1974 to March 1975. The residues were found to appear in the order to July>September>May>November≒March≒January; $\alpha$-BHC>heptachlor epoxide>dieldrin>aldrin>endrin; and in the range of 0-93 $\mu\textrm{g}$/kg dry matter.

• Proceedings of the Korean Society of Toxicology Conference
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• 2003.10b
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• pp.183-183
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• 2003

In recent years, organophosphorous (OP) pesticides have largely replaced the use of organochlorine pesticides and have been widely used in agriculture because of their rapid breakdown in water and their low environmental persistence. Consumers are directly or indirectly exposed to organophosphorous pesticides through several food groups in which a significant amount of pesticide residues have been found.(omitted)

• Journal of the Korean Chemical Society
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• v.29 no.5
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• pp.496-502
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• 1985

The solvent extraction and cleanup processes for the simultaneous gas-liquid cliromatographic determination of 16 kinds of organochlorine pesticide residues were investigated. The pesticides were extracted out from-various crops with the aqueous acetone solution acidified (pH < 1.5) by adding conc. $H_3PO_4$. Most of the pesticides were partitioned from the solution with petroleum ether. Evaporated the extracting solvent, the residues were dissolved in ethylether-petroleum ether (6 : 94) eluent and eluted through the Florisil column activated at 650$^{\circ}$C for 2.5hrs. The extraction efficiency was over 94% and impurities were effectively removed by the column chromatography.

• Journal of Microbiology and Biotechnology
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• v.23 no.11
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• pp.1598-1609
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• 2013

Organochlorine pesticide residues continue to remain as a major environmental threat worldwide. Lindane is an organochlorine pesticide widely used as an acaricide in medicine and agriculture. In the present study, a new lindane-degrading yeast strain, Pseudozyma VITJzN01, was identified as a copious producer of glycolipid biosurfactant. The glycolipid structure and type were elucidated by FTIR, NMR spectroscopy, and GC-MS analysis. The surface activity and stability of the glycolipid was analyzed. The glycolipids, characterized as mannosylerythritol lipids (MELs), exhibited excellent surface active properties and the surface tension of water was reduced to 29 mN/m. The glycolipid was stable over a wide range of pH, temperature, and salinity, showing a very low CMC of 25 mg/l. Bio-microemulsion of olive oil-in-water (O/W) was prepared using the purified biosurfactant without addition of any synthetic cosurfactants, for lindane solubilization and enhanced degradation assay in liquid and soil slurry. The O/W bio-microemulsions enhanced the solubility of lindane up to 40-folds. Degradation of lindane (700 mg/l) by VITJzN01 in liquid medium amended with bio-microemulsions was found to be enhanced by 36% in 2 days, compared with degradation in 12 days in the absence of bio-microemulsions. Lindane-spiked soil slurry incubated with bio-microemulsions also showed 20-40% enhanced degradation compared with the treatment with glycolipids or yeast alone. This is the first report on lindane degradation by Pseudozyma sp., and application of bio-microemulsions for enhanced lindane degradation. MEL-stabilized bio-microemulsions can serve as a potential tool for enhanced remediation of diverse lindane-contaminated environments.

• The Korean Journal of Food And Nutrition
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• v.14 no.5
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• pp.446-456
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• 2001

This study was carried out for the dietry safely based on the level of pesticide residues In 13 kinds of agricultural products consumed in Kyonggi-Do. Korea. From June to October 2000, sixteen organochlorine pesticides in 397 samples were analyzed by using GC/ECD and GC/MSD. According to the results, endosulfan were detected in 27(7.8%) samples and chlorothalonil were detected in 4(1.0%) samples. Detection ranges of endosulfan were 3.7437∼ 0.0488ppm for lettuce, 2.1902 ∼0.1423ppm for spinach, 2.4909 ∼0.0786ppm for mallow and 3.2333∼0.3997ppm for mustard leaf, respectively Chlorothalonil were 5.8097 for lettuce and 0.8962ppm for spinach. Consequently, six agricutural products were detected more than the maximum residue limits in Korea Endosulfan were detected In 5(1.8%) samples and cholrothalonil were detected in 1(0.3%) sample. Detection rates of endosulfan sulfate(45.9%) of agricultural products were more than $\alpha$-endosulfan(28.5% ) and $\beta$-endosulfan (23.9% ) .

• Applied Biological Chemistry
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• v.19 no.2
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• pp.112-119
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• 1976

The appearance of organochlorine pesticide residues in water, mud and clam (Meretrix lusoria) samples from the lower basin of Seomjin River around the Kwangyang Bay was surveyed to obtain the following results. 1) The concentrations of pesticide residues in the water samples were found to be in the order of dieldrin> aldrin>${\alpha}-BHC$> ${\gamma}-BHC$> endrin> heptachlor> heptachlor epoxide and in the range of $0-48ng/{\ell}$. 2) The concentrations of pesticide residues in the mud samples were found to be in the order of aldrin> dieldrin>${\alpha}-BHC$> ${\gamma}-BHC$> heptachlor> heptachlor epoxide> endrin, ranging $0-10\;{\mu}g/kg$ (dry matter), and to be more in lower layer than in upper layer. 3) The concentrations of pesticide residues in the clam samples were found to be in the of order heptachlor> ${\gamma}-BHC$> ${\alpha}-BHC$> aldrin> heptachlor epoxide> dieldrin> endrin and in the range of $0.1-18\;{\mu}g/kg$ (edible fresh muscle). The level reached the highest in 3-year old clams and sharply deceased thereafter.

• Korean Journal of Agricultural Science
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• v.43 no.4
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• pp.634-640
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• 2016

The objective of this study was to evaluate the effectiveness of using HR-GC/MS for the rapid screening of dieldrin residues in soils. Persistent organic pollutants (POPs) of organochlorine pesticides such as dieldrin, were analyzed in sedimentary rock and granite rock collected from greenhouses, Niigata, Japan. Dieldrin remains in Japanese farming soils, more than 40 years after their use as insecticides was prohibited. The averages in soil moisture ranged from 2.79% to 7.20% in soils derived from sedimentary rock and from 25.59% to 31.40% in soils derived from granite rock. Mean concentrations of dieldrin residues in sedimentary rock and granite rock were $39.7ng\;g^{-1}$ and $40.51ng\;g^{-1}$, respectively. Dieldrin residue was detected at a slightly higher concentration in granite rock than sedimentary rock samples. There was no consistency between the two soils or between surface and subsurface soils. The coefficients of variation of the two soils were 10.6% and 8.7%, respectively. These results suggest that our high-resolution mass spectrometry detector (HR-GC/MS) is effective at analyzing residual organochlorine pesticides in soil. In order to increase the precision and sensitivity for chemical analysis of POPs, high-resolution gas chromatography coupled with a HR-GC/MS is highly recommended.

• Korean Journal of Food Science and Technology
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• v.12 no.3
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• pp.216-218
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• 1980

The appearance of organochlorine insecticides in 43 samples of refined vegetable oils including rapeseed, rice bran, sesame, perilla and corn oils produced in Korea in 1976 was investigated. Residue levels varied depending on the pesticide, oil source and production area. Gas-liquid chromatographic techniques were used to detect and quantify the presence of heptachlor, its epoxide, BHC, aldrin, endrin and DDT residues.