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애호박 중 Chlorpyrifos의 잔류특성 및 수확전 잔류량 예측
박효경(Hyo Kyoung Park),노현호(Hyun Ho Noh),이광헌(Kwang Hun Lee),이재윤(Jae Yun Lee),박영순(Young Soon Park),강경원(Kyung Won Kang),이은영(Eun Young Lee),윤상순(Sang Soon Yun),진충우(Chung Woo Jin),경기성(Kee Sung Kyung) 한국농약과학회 2011 농약과학회지 Vol.15 No.4
This study was carried out to survey the residual characteristic of chlorpyrifos and estimate their residues in squash before harvest. The pesticide was sprayed onto the crop at the recommended and its double rates 10 days before the prearranged harvest and sampling was done at 0, 2,3, 5,6, 7 and 10 days after spraying. The amounts of the chlorpyrifos residue in the crop was analyzed by chromatographic method. Limit of detection (LOD) of chlorpyrifos was 0.005 mg/kg and its recovery ranged from 95.21 to 102.69%. The initial concentration of chlorpyrifos sprayed with recommended dose exceeded its MRL of 0.1 mg/kg but its concentration was less than its MRL 10 days after application. However its concentration in case of the double dose was over its MRL both immediately and 10 days after application. Biological half-lives of chlorpyrifos sprayed onto squash was 2.5 and 2.9 days at the recommended and double doses, respectively. Ten days later, the residual concentration of chlorpyrifos in squash was decreased substantially. The concentration of chlorpyrifos was estimated in squash at the given day using its regression equations. The estimated concentration of chlorpyrifos in case of application with recommended dose was below its MRL at 10 days after application but its concentration in case of application with double dose was over its MRL at 10 days of the prearranged harvest. The rate of the estimated daily intake (EDI) of chlorpyrifos to its acceptable daily intake (ADI) was 282% right after application but it decreased to less than 18% at 10 days of the prearranged harvest.
인삼 및 가공품 중 difenoconazole의 잔류특성 및 가공계수
노현호(Hyun Ho Noh),이광헌(Kwang Hun Lee),이재윤(Jae Yun Lee),이은영(Eun Young Lee),박영순(Young Soon Park),박효경(Hyo Kyoung Park),오재호(Jae Ho Oh),임무혁(Moo Hyeog Im),이용재(Yong Jae Lee),백인호(In Ho Baeg),경기성(Kee sung Kyung) 한국농약과학회 2012 농약과학회지 Vol.16 No.1
This study was carried out to elucidate the residual characteristics and calculate processing factors of difenoconazole in ginseng and its processed products, such as dried ginseng, red ginseng and their water and alcohol extracts. The pesticide was sprayed onto the ginseng according to its pre-harvest intervals in 2009 (four-year-old ginseng) and 2010 (five-year-old ginseng). Harvested ginseng was processed to dried ginseng, red ginseng and their extracts according to the commercially well-qualified conventional methods provided by the Korea Ginseng Corporation. Limit of detection (LOD) and limit of quantitation (LOQ) of difenoconazole in fresh ginseng were 0.001 and 0.003 ㎎/㎏, respectively. In case of processed ginseng products, their levels were 0.002 and 0.007 ㎎/㎏, respectively. Concentration of difenoconazole in both fresh ginseng and its processed products increased with the experimental period. Processing factors, calculated as a ratio of difenoconazole concentration in processed products to fresh ginseng were found to be 1.71 to 2.17 and 1.62 to 2.03 in case of dried and red ginseng, respectively, while those for their extracts ranged from 1.76 to 2.98. In case of five-year-old dried ginseng and red ginseng as well as their extracts, the ranges of processing factor of difenoconazole were found to be 2.9 to 3.1, 1.9 to 2.2 and 2.4 to 4.7, respectively.
청주지역 도매시장과 재래시장 유통 엽채류 중 농약의 잔류 특성
노현호(Hyun Ho Noh),이광헌(Kwang Hun Lee),이재윤(Jae Yun Lee),박효경(Hyo Kyoung Park),박소현(So Hyun Park),김선호(Sun Ho Kim),경기성(Kee Sung Kyung) 한국농약과학회 2011 농약과학회지 Vol.15 No.4
This study was carried out to survey the residual characteristics of pesticides and assess their safety. Nineteen agricultural commodities, collected from wholesale and traditional markets in Cheongju. Nineteen agricultural commodities including perilla leaves were collected from the markets on October 29th, 2010. Total 240 pesticides which can be analyzed by multiresidue analysis method by GLC and HPLC were monitored and the pesticides detected were confirmed by GC-MSD and LC-MS. Five pesticides, alachlor, bifenthrin, endosulfan, procymidone and triflumizole, were detected from five samples, such as welsh onion, leek and celery in case of wholesale market and perilla leaves and welsh onion in case of traditional market. Detection rate of 13.2% was obtained as a result of pesticide analysis but 2.6% of the pesticides detected exceeded their maximum residue limits. The estimated daily intakes (EDIs) and maximum permissible intakes (MPIs) of the pesticides detected were less than 26% and 0.05% of their acceptable daily intakes (ADIs) respectively, representing that residue levels of the pesticides detected would be safe.
유통 친환경 과실류와 과채류 중 농약잔류 실태조사 및 안전성 평가
이재윤(Jae Yun Lee),노현호(Hyun Ho Noh),박소현(So Hyun Park),이광헌(Kwang Hun Lee),박효경(Hyo Kyoung Park),홍수명(Su Myeong Hong),김두호(Doo Ho Kim),경기성(Kee Sung Kyung) 한국농약과학회 2012 농약과학회지 Vol.16 No.4
In order to monitor the residual pesticides in environment friendly agricultural commodities, fruits and fruiting vegetables. Twenty-five agricultural commodities were collected twice in May and August 2011 from nine environment friendly agricultural commodities-selling supermarkets and retail stores located in eight major cities in Korea. The number of each agricultural commodity collected, 555 samples in total, was 152 organic agricultural products, 202 pesticide-free agricultural products and 201 low-pesticide agricultural products. Pesticide residues in samples were analyzed by multiresidue method for 245 pesticides using a GCECD/ NPD and an HPLC-DAD/FLD and the peaks suspected as pesticides were identified with a GC/MSD. As a result of pesticide residue analysis, three pesticides, bifenthrin, EPN and chlorpyrifos, were detected from four samples including apple, representing a detection rate of 0.72%. The residue levels of the four pesticide-detected samples were less than their maximum residue limits (MRLs) but one pesticide EPN detected from pear exceeded its legible criterion of one twentieth MRL. Estimated daily intakes of the pesticides detected from fruits and fruiting vegetables were less than 0.76% of their maximum permissible intake.
쪽파 중 Chlorantraniliprole, Teflubenzuron 및 Trifloxystrobin의 잔류 특성
노현호 ( Hyun Ho Noh ),이재윤 ( Jae Yoon Lee ),박소현 ( Kwang Hun Lee ),이광헌 ( Hyo Kyoung Park ),진충우 ( Chung Woo Jin ),김광일 ( Kwang Ill Kim ),심석원 ( Seok Won Shim ),윤상순 ( Sang Soon Yun ),경기성 ( Kee Sung Kyung ) 한국환경농학회 2012 한국환경농학회 학술대회집 Vol.2012 No.-
인삼 중 종자분의 처리 tolclofos-methyl의 잔류 특성
노현호(Hyun Ho Noh),이재윤(Jae Yun Lee),박소현(So Hyun Park),이광헌(Kwang Hun Lee),박효경(Hyo Kyoung Park),오재호(Jae Ho Oh),권찬혁(Chan Hyeok Kwon),이중근(Joong Keun Lee),우희동(Hee Dong Woo),권기성(Ki Sung Kwon),경기성(Kee Sung Kyu 한국농약과학회 2012 농약과학회지 Vol.16 No.3
This study was carried out to evaluate residual characteristics of tolclofos-methyl in ginseng and elucidate the reason for its high detection rate from fresh ginseng selling at markets. Seeds of ginseng were sowed after seed dressing with tolclofos-methyl and after a year of growth, the young seedlings were transplanted to field. They were then harvested annually until three-years of growth and the pesticide residue was analyzed in them. LOD and LOQ of the pesticide were 0.001 and 0.003 mg/kg, respectively. Recovery test was carried out to validate the analytical method for tolclofos-methyl in ginseng. The ginseng seedlings were fortified with the test pesticide at the level of LOQ, ten times of LOQ and maximum residue concentration of tolclofos-methyl. Its recovery ranged from 77.37 to 100.16%. Residual concentration of tolclofos-methyl in ginseng seedlings just before transplanting and two-year-old ginseng were from 7.58 to 8.05 and from 6.46 to 6.79 mg/kg, respectively. In case of three-year-old ginseng, it was found to be from 4.18 to 4.35 mg/kg. As a result of annual pesticide residue analysis, concentration of the pesticide was found to decrease time-coursely in ginseng. This may be due to decomposition and increasing of fresh weight of the ginseng during the cultivation periods of three years.
동결건조에 따른 마늘 중 azoxystrobin과 flutolanil의 가공계수 및 감소계수
노현호(Hyun Ho Noh),강경원(Kyung Won Kang),박효경(Hyo Kyoung Park),이광헌(Kwang Hun Lee),이재윤(Jae Yun Lee),이은영(Eun Young Lee),박영순(Young Soon Park),경기성(Kee Sung Kyung) 한국농약과학회 2010 농약과학회지 Vol.14 No.3
In order to elucidate residual characteristics of pesticides in garlic by drying, azoxystrobin and flutolanil used for garlic were treated to the garlic by dipping for I and 5 min into their standard diluents and then the garlic was dried with a freeze-drier. The test pesticides were analyzed with a GLC-ECD/NPD. Recoveries of the pesticides ranged from 81.96 to 98.18%. Amount of azoxystrobin and flutolanil in fresh garlic were 0.34 and 1./8 ㎎/㎏ in case of dipping for 1 min. and 0.44 and 2.15 ㎎/㎏ in case of dipping for 5 min., respectively. Also, amount of azoxystrobin and flutolanil in dried garlic were 0.80 and 4.51 ㎎/㎏ in case of dipping for I min. and 1.03, 5.28 ㎎/㎏ in case of dipping for 5 minute, respectively, representing that concentration of the test pesticides in garlic were increased by drying. In case of dipping for I and 5 min., processing factors of azoxystrobin were 2.35 and 3.34 and those of flutolanil were 1.19 and J .17, respectively. Reduction factors of the pesticides in garlic were range from 0.94 to 0.97, indicating that few amounts of the test pesticides in garlic were dissipated by freeze-drying.
이재윤(Jae Yun Lee),노현호(Hyun Ho Noh),이광헌(Kwang Hun Lee),박효경(Hyo Kyoung Park),오재호(Jae Ho Oh),임무혁(Moo Hyeog Im),권찬혁(Chan Hyeok Kwon),이중근(Joong Keun Lee),우희동(Hee Dong Woo),권기성(Ki Sung Kwon),경기성(Kee Sung Kyu 한국농약과학회 2012 농약과학회지 Vol.16 No.3
This study was carried out to evaluate the residual characteristics of azoxystrobin in fresh ginseng and calculate its processing factors in processed products, such as dried ginseng, red ginseng and their extracts. Azoxystrobin was sprayed annually onto four-year-old ginseng according to its pre-harvest interval (PHI) for two years. Harvested ginsengs were processed according to the commercially well-qualified conventional methods provided by the Korea Ginseng Corporation. Limits of detection (LODs) of azoxystrobin in fresh ginseng and its processed products were 0.001 and 0.002 mg/kg, respectively. Also limits of quantitation (LOQs) in fresh ginseng and its processed products were 0.003 and 0.007 mg/kg, respectively. Recoveries of the analytical methods in fresh ginseng and its processed products ranged from 69.3 to 114.8%. Highest residue amounts in fresh ginseng and its processed products were 0.025 and 0.118 mg/kg, respectively. Processing factors of the processed products ranged from 1.85 to 3.17 in four-year-old ginseng and from 2.48 to 5.84 five-year-old ginseng.
노현호(Hyun Ho Noh),이재윤(Jae Yun Lee),이광헌(Kwang Hun Lee),박효경(Hyo Kyoung Park),경기성(Kee Sung Kyung) 한국농약과학회 2013 농약과학회지 Vol.17 No.3
This experiment was carried out to estimate leaching potential of thirteen endocrine disruptorsuspected pesticides in upland soils using soil columns (5 cm I.D. × 35 cm H.) packed with soil A (sandy loam) and soil B (loam). When 12.6 mL of water, average precipitation in Cheongju area during the period from June to August, 2001-2010, was percolated through soil column packed with soil A every day for 21 days, no pesticides were detected from leachate, with the exception of metribuzin which was detected with negligible. Also, when 2 L of water was percolated consecutively five times through soil columns packed with soil A and B, irrespective of soil types, cypermethrin, endosulfan, fenvalerate, parathion and trifluralin, which were very low water solubilities and high soil Kocs, were not detected from leachate and were distributed mostly in the depth of 0-5 cm, representing that water solubility and soil K<SUB>oc</SUB> are major contributing factors to their leaching behavior. Despite high average leaching rates in carbaryl and methomyl, actual possibilities of ground water contamination in the agricultural environment by them would be very low, considering that the negligible amount of pesticide was percolated through a lysimeter with an undisturbed soil core simulating the field conditions, while most of pesticide was percolated through a soil column with the disturbed soil profile.