• Analytical Science and Technology
• /
• v.23 no.2
• /
• pp.128-137
• /
• 2010

The purpose of this study is to set up the analytical method of new persistent organic pollutants (POPs) such as chlordecone, endosulfan, ${\alpha}$-HCH, ${\beta}$-HCH, ${\gamma}$-HCH. The analytical methods for these compounds listed as new POPs by the Stockholm Convention need to be newly established. Therefore, we proposed the analytical method for 5 organic chlorinated pesticides (OCPs) and then applied the analytical method to environmental samples. To do this, the pre-treatment such as florisil and activated carbon cleanup process in the Korean official method for classic POPs had been reviewed. All of compounds except chlordecone were pre-treated simultaneously with reviewed cleanup process and detected by GC/MS and HRGC/HRMS respectively. There is a problem that chlordecone could not get a high sensitivity by GC analysis, but in this study GC/MS method was proposed.

• Journal of Environmental Science International
• /
• v.12 no.4
• /
• pp.477-480
• /
• 2003

Pesticides were extracted from samples with 70% acetone and methylene chloride in order, and then cleaned up via open-column chromatography apparatus packed with florisil, and finally analyzed simultaneously the organochlorine and pyrethroid pesticides using GC(ECD). An ultra-2 fused silica capillary column was used to separate and identify the products. The resolution between the last isomeric peak of cypermethrin(59.987min) and the first isomeric peak of flucythrinate(60.043min) was not satisfactory. The last isomeric peak of fenvalerate(62.344min) and the first isomeric peak of fluvalinate(62.397min) were overlapped. Recoveries of soybean sample fer the most pesticides were 73.3% to 102.4%. Detection limits were between 0.004 and 0.063 ${\mu}$g/mg when this method was used.

• Journal of Soil and Groundwater Environment
• /
• v.9 no.2
• /
• pp.41-47
• /
• 2004

This research in the degradation of polychlorinated biphenyls(PCB) has focussed on the use of experimental enrichment cultures to obtain PCB-deading communities and identification of PCB-degrading bacteria accor야ng to pure culture. During 180 days, enrichment culture was performed to obtain PCB-degrading bacteria and initial concentration was injected 1.6 ppm,0.7 ppm, respectively. After 180 days of enrichment culture, PCBs was removed 80-87% and 57-71%. Biodegradation of PCBs was studied according to dominated PCB-degrading bacteria. Biodegraddation of PCBs was 80% in initial concentration of PCBs for 20days, enrichment cultured PCB-degrading bacteria was isolated by pure culture and it was verified to Pseudoxanthomonas sp.

• Environmental Analysis Health and Toxicology
• /
• v.23 no.3
• /
• pp.201-211
• /
• 2008

This study was performed to find the atmospheric concentrations of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) at four different heights (l0, 50, 150 and 1,500 cm) using low volume polyurethane foam (PUF) plug air sampler in semi-rural area. ${\alpha}-/{\beta}-/{\gamma}-HCH$ with low molecular weights and Koa (octanol-air partitioning coefficient) in OCPs were similarly high concentrations at all heights, but the other OCPs (p,p'-DDE, p,p'-DDD, p,p'-DDT, Heptachlor epoxide, ${\gamma}$-CHL, ${\alpha}$-CHL, Trans-nonachlor) with high molecular weights and Koa decreased with increasing heights. However, the concentrations of PCBs increased with increasing height.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 2002.09a
• /
• pp.113-116
• /
• 2002

UV/과산화수소법을 적용하여 유기염소계 농약인 chlorothalonil을 분해하는 공정에 있어서 광화학 반응의 효율을 증대시키는 방안으로 과산화수소와 옥살산염의 최적 주입농도를 선정하여 그 제거효율을 비교하였다. 그 결과 UV조사시 과산화수소의 농도가 100ppm일 때 일차반응속도 상수(k)가 0.0869로 가장 높게 나타났으며 옥살산염에서는 1mM일 때 0.1782로 높게 나타남으로써 과산화수소와 옥살산염의 최적 농도를 산출할 수가 있었다. 최적 과산화수소와 옥살산염을 조합하여 UV조사시 반응속도 상수값(k)이 0.1893으로 UV/옥살산염보다도 분해속도가 빠르게 나타났다.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.44 no.3
• /
• pp.207-215
• /
• 2011

An endosulfan degrading bacterial strain, K-1321, was isolated by endosulfan-enrichment culture from a seaside sediment collected at Dadaepo Beach, Busan, Korea. The strain was identified as a Serratia sp. based on the results of morphological, biochemical and 16S rDNA homology analyses. Serratia sp. K-1321 was able to completely degrade 50 ppm endosulfan in culture media and soil within 6 weeks at $25^{\circ}C$. GC/MS analysis revealed that endosulfan diol was an intermediate of the bacterial endosulfan degradation. Considering the above results, we concluded that Serratia sp. K-1321 utilized endosulfan as a carbon source and metabolized endosulfan via a less toxic pathway, such as the formation of endosulfan diol as an intermediate.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2001.11a
• /
• pp.157-158
• /
• 2001

Hexachlorocyclohexane(HCH, 또한 benzene hexachioride(BHC)라고도 부름)은 세계 도처에서 발견되는 주요 난분해성 유기염소계 화합물들(persistent organochlorine compounds)중 하나이며, 또한 환경중 거동 및 영향들과 관련하여 가장 많이 연구되어진 살충제중 하나이다(Li et al., 1996). Technical HCH mixture($\alpha$-, $\beta$-, ${\gamma}$-, $\delta$- 및 $\varepsilon$-HCH 이성질체들의 혼합물)와 technical lindane(거의 단일의 ${\gamma}$-HCH 이성질체로 구성)은 농업, 산림 및 위생 방면에 다양한 목적을 위해 1940년말 이래로 많은 양이 사용되어져 왔다(Li et al., 1996; Breivik et al., 1999). (중략)

• Journal of Korean Society for Atmospheric Environment
• /
• v.18 no.6
• /
• pp.475-485
• /
• 2002

An analytical method was investigated for the meaiiurement of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) concentrations in air samples. Procedures required for column chromatographic clean up. silicagel (stage I) and gel permeation chromatography (stage II), were discussed. Identification and quantification of PCBs and OCPs were performed using a combination of gas chromatography/mass spectrometry/ selected ion monitoring. Recovery tests calculated from six samples are 68∼137% for PCBs and 58∼130% for OCPs except for endrin aldehyde. Instrumental detection limits determined for the PCBs and OCPs varied from 0.05 to 0.18 pg/m3 and from 0.71 to 16.82 pg/㎥, respectively. The method has been applied to the analysis of air samples collected at Ansung city, Kyonggi province, Korea. This method may serve as a screening protocol for the simultaneous determination of PCBs and OCPs in air.

• Korean Journal of Food Science and Technology
• /
• v.14 no.1
• /
• pp.82-93
• /
• 1982

The use pattern and survey data on the residue levels of organochlorine insecticides in Korea were summarized. On the basis of available data on food consumption and residue levels, the daily intake of the pesticide chemicals by average Korean adults were calculated to give $13.77\;{\mu}g$ of total BHC, $2.45\;{\mu}g$ of total DDT and $4.06\;{\mu}g$ of heptachlor and its epoxide. These intake levels were compared with the acceptable daily intake proposed by FAO/WHO and values obtained in other countries. It was then proposed to undertake a total diet study on pesticide chemicals for the sake of food safety assurrance and reasonable regulation of pesticides for food production in this country.

• Korean Journal of Environmental Agriculture
• /
• v.4 no.1
• /
• pp.6-10
• /
• 1985

Residue levels of 10 kinds of organochlorine insectides in/on garlic produced in Chungnam area during $1982{\sim}1983$ were investigated. Residue levels ranged in $trace{\sim}0.004 ppm$ (aver. 0.002 ppm) for ${\alpha}-BHC$, $0.015{\sim}0.176 ppm$ (aver. 0.083 ppm) for ${\gamma}-BHC$, $0.001{\sim}0.008 ppm$ (aver. 0.005 ppm) for heptachlor, ND(not detected) ${\sim}0.006 ppm$ (aver. 0.003 ppm) for aldrin, $trace{\sim}0.011 ppm$(aver. 0.003 ppm) for ${\alpha}-endosulfan$, $ND{\sim}0.004 ppm$ (aver. 0.001 ppm) for heptachlor epoxide, $trace{\sim}0.002 ppm$(aver. 0.001 ppm) for dieldrin, $trace{\sim}0.008 ppm$(aver. 0.001 ppm) for ${\beta}-endosulfan$, and trace for p,p'-DDD and p,p'-DDT.