• 펄프종이기술
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• 제45권6호
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• pp.78-87
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• 2013

Even though the notice No. 2010-11 of the Ministry of Food and Drug Safety Administration that has been applied to analyze the content of the water soluble residue eluted from multi-layer paperboard was abolished in 2011, its application for the analysis on evaporation residue is still valid. There are very high possibilities that the noticed existing method gives the misleading result on the evaporation residue due to the water soluble starch eluted from the multi-layer paperboard. The quantitative analysis on water-soluble residue with starch content correction has been carried in the study using UV/Vis spectroscopy and HPLC. The UV/Vis spectroscopy absorbance analysis showed the large amount of the oxidized starch obtained from the aqueous residue eluted out of the multi-layer paperboard after the iodine, ${\alpha}$-amylase reaction, and starch hydrolysis. The residual content decreased by the correction through the enzyme hydrolysis.

• 분석과학
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• 제9권2호
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• pp.1033-1060
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• 1996

• 한국환경농학회지
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• 제35권3호
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• pp.223-233
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• 2016

BACKGROUND: This study was to develop a analytical reference material including twenty pesticides in tomato. To use it for proficiency test, the suitability of homogeneity, storage stability, assigned values and uncertainty for analytical reference material were important.METHODS AND RESULTS: In order to develop a analytical reference material of tomato for multi-residue analysis of pesticides, twenty-pesticides were treated in tomato and the samples were frozen and homogenized. The homogeneity, stability, assigned value and uncertainty were calculated according to the requirements of the KS A ISO Guide 35, KS Q ISO 13528 and EURL-PT protocol. The values of the within-bottle standard variation(s_wb) and the between-bottle standard variation(s_bb) were 0.9~6.5% of assigned value and the uncertainty(u*_bb) due to inhomogeneity was also calculated as 0.6~1.9% for all pesticides. This indicated that it was satisfactory to be used as a analytical reference material. The storage stabilities of twenty-pesticides at room temperature and freezing conditions were assessed according to the requirement of the KS Q ISO Guide 35. All pesticides were stable at room temperature (20~30℃) for 8 days and freezing (-20℃) for 23 days.CONCLUSION: The feasibility of analytical reference material for pesticide multi-residue analysis in a tomato matrix was investigated. Homogeneity of within/between-bottle, uncertainty and stabilities at room temperature and freezing condition were satisfactory for a use of proficiency test and quality control. From these results, a analytical reference material would be applicable to monitor the proficiency test of pesticide analysis organizations to improve the reliability and consistency.

• 한국환경과학회지
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• 제6권4호
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• pp.385-389
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• 1997

농약 잔류물을 70% acetone으로 추출한 다음 dichloromethane 층으로 옮겨 추출물을 florisil과 alumina-N으로 충진시켜 column chromatography를 행하였다. 마지막 추출물을 electron-capture detector(GC/ECD)와 nitrogen-phosphorus detector(GC/NPD)를 가진 GC로 분석하였다. 분석 결과 17 가지의 유기염소계 농약과 15 가지의 유기인계 농약의 회수율이 각각 60.8 에서 84.9%와 70.5에서 100.0%의 범위이었으며(phosmet와 azlnphos-methyl은 제외) 본 분석 방법의 최소 검출 준위도 낮았다(0.021-0.058mg/kg).

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 추계학술발표회
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• pp.81-85
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• 2002

The possibility of simultaneous analysis of 24 pesticides out of 30 residual pesticides which are subjected to test in the golf courses was examined. The utility of the simultaneous analysis of multi-residue pesticides was evaluated by recovery test through a standard addition method of pesticides in water, soil, and lawn grass. The experimental results of the recovery rates for individual pesticides are as follows : The number of pesticide of which average recovery was over 70% regardless of medium was 16 pesticides. These pesticides were composed of 8 organophosphorus pesticides(Chlorpyrifos, Chlorpyrifos-methyl, Diazinon, EPN, Fenitrothion, Phenthoate, Phosalone, and Toclofos-methyl). 4 organochlorinated pesticides(Daconil, Captan, Endosulfan, and Tetradifon), 2 pyrethroid pesticides(Fepropathrin, Lambda-cyhalothrin) and 2 other pesticides(Bromopropylate, Pendimethalin). On the other hand, in case of Dicofol, average recovery by medium was over 70% for water and lawn grass but was only 53.3% for soil. Therefore, the simultaneous analytical method applied in this experiment is not appropriate for analysis of Dicofol in soil. Furthermore, among 7 pesticides, 2 pesticides(Amitraz and Pyraclofos) showed that theirs average recovery rates deviated from criteria(70~130%) at almost all media, while 5 pesticides(Bensulide, Deltamethrin, Iprodione, Phosphamidon and Tralomethlin) were not detected from all media by selected GC detector(NPD or ECD).

• 농약과학회지
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• 제18권4호
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• pp.278-295
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• 2014

농수산물검사소에서는 빠르고 정확한 잔류농약검사법이 필요하므로 QuEChERS 시료 전처리법과 GC-TOF/MS(가스크로마토그래피 비행시간질량분석기와 GC-ECD(전자포획검출기), GC-NPD(질소인검출기) 기기분석을 이용하여 잔류농약 동시다성분 분석의 가능성을 살펴보았다. GC-TOF/MS에서는 138종의 농약성분을 0.3, $0.5{\mu}g/g$수준으로 상추에 처리 후 회수율 측정을 하였다. 동시다성분 회수율기준 70~130% 범위에 들어오고 표준편차 20% 이내인 농약은 61종이었다. GC-ECD, NPD에서는 145종의 농약성분 중 71종이 적정한 회수율 범위 내에 들었다. 이러한 결과는 일부 농약성분에 대해 QuEChERS 시료 전처리법과 GC-TOF/MS, GC-ECD, NPD를을 이용한 잔류농약 동시다성분분석 방법 적용 가능성을 보여주었다.

• 대한본초학회지
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• 제21권4호
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• pp.37-41
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• 2006

Objectives : This study has been conducted to investigate the amount of residual pesticide in herbal medicine of Osterici Radix which are purchased on Kwangju(Hanyaksarang). Methods : In order to analyze many pesticides in Osterici Radix, simultaneous multi-residue analysis of pesticides by GC-ECD/NFD was used. Results : But the amount of residual pesticide in Osterici Radix, simultaneous multi-residue analysis of pesticides by GC-ECD/NFD was used. Conclusion : These results indicate that Osterici Radix in current has safety. In future, it is considered the results of this study will be furnished the basis to succeeding studies and it is needed to extensive comparative study for the same genus-degree of relatedness.

• 동력기계공학회지
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• 제18권6호
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• pp.113-119
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• 2014

Due to the development of the petroleum refining technology and continuously increased demand from markets, a quantity of gasoline and diesel oil produced from a restricted quantity of crude oil has been increasing, and residual fuel to be used at marine diesel engines has been gradually becoming low quality. As a result, it was recently reported that trouble oils which cause abnormal combustion such as knocking with extreme noise and misfire from internal combustion engines were increasing throughout the world. In this study, an author investigated ignitability and combustion quality by using combustion analyzer with constant volume(FCA, Fuel Combustion Analyzer) and middle speed diesel engine about MDO(Marine Diesel Oil), HFO(Heavy Fuel Oil), LCO(Light Cycle Oil) and Blend-HFO which was blended LCO of 1000 liters with HFO of 600 liters. Moreover, for betterment of ignitability and combustion quality of injected fuels, multi-injection experiment was carried out in the diesel engine using Blend-HFO. According to the results of FCA analysis, ignitability and combustion quality was bad in the order of MDO

• 한국환경과학회지
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• 제15권1호
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• pp.85-94
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• 2006

The simultaneous analysis of multi-residual pesticides was developed using a gas chromatography (GC) method. In this study, a simple and reliable methodology was improved to detect 154 kinds of pesticides in sinseng extract sample by using a liquid-liquid extraction procedure, open column chromagraphy and chromatographic analysis by CC electron capture detector (ECD) and GC nitrogen-phosphorus detector (NPD). The 154 kinds of pesticides were classified in 4 groups according to the chemical structure. The extraction of pesticides was experimented with $70\%$ acetone and dichloromethane/petroleum ether in order, and cleaned up via open column chromatography $(3\times30cm)$ packed with florisil $(30g,\;130^{\circ}C,\;12hrs)$. The final extract was concentrated in a rotator evaporator at $40^{\circ}C$ until dryness. Then the residue was redissolved to 2ml with acetone, and analyzed by GC-ECD and GC-NPD. The applied concentration of pesticides was over $1\~10{\mu}g/ml$. The recovery tests were ranged from $70.7\%$ to $115.2\%$ with standard deviations between 0.3 and $5.7\%$ of the standard spiked to the ginseng extract sample (Group $I\~IV$). The limit of detection (LOD) ranged from 0.001 to $0.099{\mu}g/ml$ (Group $I\~IV$). The 9 kinds of pesticides were not detected. The developed method was applied satisfactory to the determination of the 154 kinds of pesticides in the ginseng extract with good reproducibility and accuracy.

• 한국환경농학회지
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• 제42권3호
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• pp.193-202
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• 2023

Residue monitoring of propiconazole (PCZ) in cabbage, shallot, and spinach was conducted under multi-trial greenhouse conditions. This study aimed to understand the fate of the applied fungicide in these vegetables. Furthermore, the associated health risk of PCZ in leafy vegetables was assessed through dietary risk assessment. Commercially available PCZ (22% suspension concentrate) was administered thrice according to the OECD fungicide application interval guideline. The plant samples were extracted using a slightly modified QuEChERS technique and analyzed using gas chromatography-tandem mass spectrometry. The average PCZ recovery was between 84.5% and 117.6%, with a <5% coefficient of variance. The dissipation of PCZ residue in cabbage, shallot, and spinach after 14 days was 96%, 90%, and 99%, respectively, with half-lives of <5 days. Meanwhile, dietary risk assessments of PCZ residues in the studied vegetables using the risk quotient (RQ) were significant < 100 (RQ < 100). Thus, the population groups considered in this study were not at substantial risk from consuming leafy vegetables sprayed with PCZ following critical, good agricultural practices.