• Title/Summary/Keyword: 잔류분

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Studies on the Residues of Chlorinated Organic Insecticides -3. Heptachlor residues in soil 15 years after yearly treatment of the soil insecticide in a tobacco field- (유기염소계 살충제의 잔류분에 관한 연구 -3. 담배연작토양의 Heptachlor 잔류분에 관하여-)

  • Park, Chang-Kyu
    • Applied Biological Chemistry
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    • v.18 no.2
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    • pp.61-64
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    • 1975
  • Soil residues in a tobacco field yearly treated with a soil insecticide, Heptachlor, was analyzed by GLC equipped with electron capture detector(ECD). In addition, translocation of the heptachlor residues into two staple vegetables, radish and chinese cabbage was also studied under field conditions. The results were summarized as follows; 1. The Heptachlor residues in the soil of tobacco plots were less than 0.010 ppm. 2. The Heptachlor residues in radish and chinese cabbages cultivated in the tobacco plot were also below 0.010 ppm. 3. Amount of Heptachlor residues translocated into the vegetables were not related to the concentrations of the residues in the soil.

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Determination and confirmation of the carbendazim residue in soybean sprout (콩나물중 살균제 carbendazim 잔류분의 정량 및 확인)

  • Kim, Young-Gook;Park, Jong-Tae;Hong, Suk-Soon
    • The Korean Journal of Pesticide Science
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    • v.2 no.3
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    • pp.79-84
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    • 1998
  • Tandem HPLC and atmospheric pressure chemical ionization(APcI) LC/MS method was used for the determination and confirmation of carbendazim residues in soybean sprout. Fluorescence(FL) detector was connected in tandem with the ultraviolet(UV) detector for dual detection of the carbendazim residue at the excitation and emission wavelength of 280 nm and 310 nm, respectively. The limit of detection for carbendazim was $0.1{\mu}g/kg$ sample. Recoveries of carbendazim from fortified soybean sprout at 0.5, 1.0 and 2.0 ppm were averaged 89.1%. Mass spectrometry using a APcI source confirmed the carbendazim residue in the soybean sprout sample. Fragmentation pattern on the APcI LC/MS spectrum of carbendazim was simpler than that from electron impact(EI) mass spectrum. Carbendazim produced 3 major ions including m/z 133, m/z 159 and m/z 191($M^{+}$). This method was sensitive enough to provide reliable and reproducible results for practical applications.

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Studies on the Residues of Chlorinated Organic Insecticides - I. Heptachlor Residues in or on Commercial Vegetables - (유기염소계(有機鹽素系) 살충제(殺蟲劑)의 잔류분(殘留分)에 관(關)한 연구(硏究) - 1. 시판채소중(市販菜蔬中) Heptachlor 잔류분(殘留分)에 관(關)하여 -)

  • Park, Chang-Kyu;Yoo, Jai-Yoon
    • Applied Biological Chemistry
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    • v.15 no.1
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    • pp.7-17
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    • 1972
  • Samples of 13 vegetables were collected, between 14 July and 6 August, 1971, from 15 markets located in 12 different cities and analyzed for Heptachlor residues by gas liquid chromatograph. The residue concentrations of Heptachlor and its epoxide were estimated separately, at a sensitivity level of 0.001 p.p.m., to produce Heptachlor residues on the fresh weight basis. The Heptachlor residues in or on the crops analyzed, including three staple vegetables, potatoe, radish and chinese cabbage, were found fairly low and are far lower than the residue tolerences for respective vegetables recommended jointly by FAO and WHO of the United Nations.

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Degradation of [$^{14}C$]Carbofuran in Soils and Characterization of its Nonextractable Residues (토양중 [$^{14}C$Carbofuran의 분해 및 비추출성 잔류분의 특성)

  • Park, Chang-Kyu;Lee, Young-Deuk
    • Applied Biological Chemistry
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    • v.38 no.3
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    • pp.263-268
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    • 1995
  • A study was undertaken to compare degradation patterns of carbofuran in soils between submerged and upland moisture conditions [$3-^{14}C$]Carbofuran was treated in each soils at the rate of 1.0 mg/kg (87.8 kBq $^{14}C/50g$ soil) and the time-course analysis for distribution of radioactivity and degradation products were conducted. Differences in the pathway and rate of carbofuran degradation in soils were observed between submerged and upland moisture conditiona major degradation being hydrolysis at 7-C position and oxidation at 3-C position, respectively. Carbofuran showed less persistence in soils of higher moisture contents A significant portion, $24{\sim}39%$ of the total radioactivity, resided in soils as nonextractable residues at 60 days after treatment The nonextractable radioactivity was mainly located in soil organic matter, fulvic acid, humic acid and humin factions Gel filtration chromatography confirmed the incorporation of carbofuran and its degradation products into the organic matter.

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A Study on the Neoasozine Residues in Rice Grain by Neutron Activation Method (방사화(放射化) 분석법(分析法)에 의한 미곡(米穀)중 네오아소진 잔류분(殘留分)에 관한 연구(硏究))

  • Kim, Yong-Hwa;Lee, Koon-Ja;Lee, Su-Rae
    • Korean Journal of Food Science and Technology
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    • v.13 no.1
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    • pp.20-24
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    • 1981
  • Residues of neoasozine in rice grain were determined by neutron activation and colorimetric techniques. Twice application of the chemical before flowering did not lead to any increased residue level while 4-times application resulted in significant increase in the residue level up to 0.54-0.75 mg $As_2O_3/kg$. The partition ratio of arsenic residues into polished rice grain and bran was 73 : 27 in 100% polishing while most of the residues in the bran was transferred to oil cake fraction during solvent extraction, reaching up to 2.9 mg $As_2O_3/kg$. The neutron activation technique was advantageous because of its high sensitivity and the smaller sample amounts required for analysis.

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Behavior of ^{14}C$--BHC Residues in Rice Grain (미곡에 있어서 ^{14}C$-BHC 잔류분의 행동)

  • Su-Rae Lee;Yong-Hwa Kim
    • Nuclear Engineering and Technology
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    • v.13 no.4
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    • pp.221-228
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    • 1981
  • ${\gamma}$-(U-$^{14}$ C)-BHC was applied to rice plants grown in a pot and its fate in the growth, polishing and oil-extraction processes of the grain was investigated. The $^{14}$ C-activity was absorbed and translocated widely in the plant and the recovery of applied $^{14}$ C-activity in the straw and grain was about 2.8%, of which 9.4% was found in the brown rice. The % partitioning of $^{14}$ C-residues in bran and polished rice was 12:88 and that in oil and oilcake was 37 : 63. Characterization of $^{14}$ C-residues indicated the presence of ${\gamma}$-BHC, pentachlorocyclohexene, trichlorobenzene and hydrophilic metabolites, whose proportions were different in the straw and grain.

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Analysis of Organochlorine Pesticide Residues in the Presence of Polychlorinated Biphenyls (PCBs) -Part II. Analysis of River Sediments and Cultivating Soils in the Peripheries of Several Industrial Estates- (Polychlorinated Biphenyls(PCBs) 존재하(存在下)에 유기염소계(有機鹽素系) 살충제의 잔류분(殘留分) 분석(分析) -제2보(第2報), 공단주변(工團周邊)의 하천(河川) 및 전답토양(田畓土壤) 분석(分析)-)

  • Park, Chang-Kyu;Park, No-Dong
    • Applied Biological Chemistry
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    • v.23 no.1
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    • pp.58-63
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    • 1980
  • Present investigation is undertaken to evaluate residues of organochlorine pesticides and PCBs in river sediments and cultivated soils by GLC. Main sampling areas chosen were three industrial estates, Suwon, Iri and Kumi. Samples consist of river sediments and cultivated soils, in Suwon, Iri and Chilgok, which are likely to be accumulated with PCBs from nearby factories. Organochlorine pesticide residues were found in all sediments and soil samples while no PCBs residue was detected in all samples analyzed. The pesticide residues were greatest in the Suwon and least in Chilgok soils. p,p'-DDT and BHC isomers $({\alpha}-,\;and\;{\gamma}-)$ were found in all soil samples. p,p'-DDT, at the range of 0.006-0.840 ppm, was the most abundant residues among organochlorine insecticides.

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Establishment of Analytical Method for Pencycuron in Representative Agricultural Commodities by High-Performance Liquid Chromatography (대표 농산물 중 살균제 Pencycuron의 HPLC 정밀 잔류분석법 개발)

  • Lee, Hyeri;Choi, Hoon;Kim, Byung-Joon;Kim, Eunhye;Kim, Su-Hee;Lee, Jin-Beom;Lee, Young Deuk;Kim, Jeong-Han
    • The Korean Journal of Pesticide Science
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    • v.21 no.1
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    • pp.75-83
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    • 2017
  • The single residue analytical method was developed for determining fungicide pencycuron residues in various agricultural commodities with high-performance liquid chromatography (HPLC). Pencycuron residue was extracted with acetone from representative crops such as Korean cabbage, apple, brown rice and green pepper. After ethyl acetate/n-hexane partition and subsequent clean-up with silica gel chromatography, pencycuron residue was quantified by reversed phase HPLC with UV detection at 240 nm. The suspected residue of pencycuron was confirmed using selected-ion monitoring (SIM) LC/mass spectrometry (MS). Instrumental limit of quantitation (ILOQ) and method LOQ (MLOQ) were set at 2 ng and 0.02 mg/kg, respectively. Overall recoveries of pencycuron from different crop samples fortified at three levels (MLOQ, 10MLOQ, 100MLOQ) were 72~108%. This proposed method could be useful as official analytical method for quantification of pencycuron residues in agricultural commodities.

Analytical Method of Bentazone Residue in Agricultural Commodities Using HPLC-UVD/MS (HPLC-UVD/MS를 이용한 농산물 중 bentazone의 분석법 확립)

  • Kim, Young-Hak;Lee, Su-Jin;Song, Lee-Seul;Hwang, Young-Sun;Lee, Young-Deuk;Choung, Myoung-Gun
    • The Korean Journal of Pesticide Science
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    • v.15 no.2
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    • pp.149-159
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    • 2011
  • Bentazone is benzothiadiazole group herbicide, and used to foliage treatment. This herbicide have already been widely used for cereals and vegetables planting in worldwide. This experiment was conducted to establish a determination method for bentazone residue in crops using HPLC-UVD/MS. Bentazone residue was extracted with acetone (adjusted pH 1 with phosphoric acid) from representative samples of five raw products which comprised hulled rice, soybean, apple, green pepper, and Chinese cabbage. The extract was diluted with saline water, and dichloromethane partition was followed to recover bentazone from the aqueous phase. Florisil column chromatography was additionally employed for final clean up of the extract. The bentazone was quantitated by HPLC with UVD, using a YMC ODS AM 303 ($4.6{\times}250$ mm) column. The crops were fortified with bentazone at 3 levels per crop. Mean recovery ratio were ranged from 82.0% for a 0.2 mg/kg in apple to 97.9% for a 0.02 mg/kg in Chinese cabbage. The coefficients of variation were ranged from 0.5% for a 0.02 mg/kg in soybean to 9.7% for a 0.02 mg/kg in Chinese cabbage. Quantitative limit of bentazone was 0.02 mg/kg in representative five crop samples. A LC/MS with selected-ion monitoring was also provided to confirm the suspected residue. Therefore, this analytical method was reproducible and sensitive enough to determine the residue of bentazone in agricultural commodities.

Determination of Ametryn Residue in Agricultural Commodities Using HPLC-UVD/MS (HPLC-UVD/MS를 이용한 농산물 중 ametryn의 분석)

  • Lee, Su-Jin;Kim, Young-Hak;Song, Lee-Seul;Choung, Myoung-Gun
    • The Korean Journal of Pesticide Science
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    • v.15 no.2
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    • pp.125-133
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    • 2011
  • Ametryn is used in USA, China, and Japan, but not introduced in Korea yet. So, MRL (Maximum Residue Level), and analytical method of ametryn were not establishment in Korea. Therefore, this experiment was conducted to establish a determination method for ametryn residue in crops using HPLC-UVD/MS. Ametryn residue was extracted with acetone from representative samples of five raw products which comprised hulled rice, soybean, apple, green pepper, and Chinese cabbage. The extract was diluted with saline water, and dichloromethane partition was followed to recover ametryn from the aqueous phase. Florisil column chromatography was additionally employed for final clean up of the extract. The ametryn was quantitated by HPLC with UVD, using a Tosoh ODS 120T ($4.6{\times}250$ mm) column. The crops were fortified with ametryn at 2 levels per crop. Mean recovery ratio were ranged from 83.7% for a 0.2 mg/kg in soybean to 91.1% for a 1.0 mg/kg in hulled rice. The coefficients of variation were ranged from 1.2% for a 1.0 mg/kg in hulled rice to 3.6% for a 1.0 mg/kg in soybean. Quantitative limit of amatryn was 0.02 mg/kg in representative 5 crop samples. A LC/MS with selected-ion monitoring was also provided to confirm the suspected residue. Therefore, this analytical method was reproducible and sensitive enough to determine the residue of ametryne in agricultural commodities.