• Title, Summary, Keyword: 잔류분

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Elimination of BHC Residues in the Polishing and Cooking Processes of Brown Rice (현미(玄米)의 도정(搗精) 및 취반(炊飯) 과정중 BHC 잔류분(殘留分)의 제거(除去))

  • Kim, Yong-Hwa;Kim, Hye-Nam;Kim, Sang-Soon;Lee, Su-Rae
    • Korean Journal of Food Science and Technology
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    • v.11 no.1
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    • pp.18-25
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    • 1979
  • In order to investigate the effect of polishing washing and cooking processes on the residue level of BHC in rice grain, brown rice samples having a 0.3 ppm total BHC content were subjected to various treatments and residue analysis. The results are summarized as follows: 1) The conventional polishing process of brown rice decreased the residue level down to 8 and 20% for 100 and 70% polished rice, respectively. 2) The washing procedure decreased the level to 34 and 31% for 100 and 70% polished rice, respectively. 3) The cooking processes with a conventional kettle and an automatic electric cooker decreased the residue level to 86 and 77% in 100% polished rice, and 69 and 41% in 70% polished rice, respectively. 4) By summation of the above results in sequence. it was concluded that the residue levels of BHC in cooked rice were 2.3 and 4.3% of original residue in the brown rice for 100 and 70% polished rice, respectively.

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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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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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Operating Principle of Residual Gas Analyzer (잔류가스분석기 (RGA)의 작동원리)

  • Park, C.J.
    • Journal of the Korean Vacuum Society
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    • v.17 no.4
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    • pp.262-269
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    • 2008
  • The residual gas analyzer (RGA) is employed for the process control of a vacuum system by measuring residual gases in it. This review paper introduces operating principles of the RGA and problems that can be encountered during use, together with their possible solutions.

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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잔류가스분석기를 활용한 베이크아웃 시험 종료조건 수립 검토 결과

  • Park, Seong-Uk;Seo, Hui-Jun;Jo, Hyeok-Jin;Im, Seong-Jin;Son, Eun-Hye;Mun, Gwi-Won
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.103.1-103.1
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    • 2015
  • 위성체 개발에 있어서 지상에서 위성체의 부품에 대한 고온($85^{\circ}C$ 이상)과 고진공($5.0{\times}10-3Pa$ 이하)의 상태를 모사하여 오염물질을 제거하는 베이크아웃 시험이 필수적이다. 일반적으로 베이크아웃 시험의 종료여부는 TQCM (Thermoelectric Quartz Crystal Microbalance)을 이용한 탈기체(outgassing)의 흡착률을 측정하여 결정한다. 측정된 흡착률을 통해 시험 대상 표면에서 발생하는 탈기체량을 추정할 수 있으며, 결국 시험 대상의 우주 부품으로써의 적합성을 판단할 수 있다. TQCM을 적용하지 못하는 경우, 베이크아웃 시험 종료여부를 판단하기 위해 잔류가스분석기(Residual Gas Analyzer: RGA)를 활용하는 것을 고려하였다. 베이크아웃 시험 중 잔류가스분석기를 활용하여 시편에서 방출되는 오염물질을 측정하였으며, 그 중 측정량이 가장 많은 40-45 amu 범위의 측정값 추이를 관찰하여, 베이크아웃 시험 종료조건 수립 가능성을 검토하였다.

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Physicochemical Properties of Unburned Carbon from Fly Ash (비산회로부터 회수한 미연탄소분의 물리.화학적 특성)

  • 안양규;양정일
    • Journal of the Korean Institute of Resources Recycling
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    • v.7 no.1
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    • pp.14-19
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    • 1998
  • Tile pl~ysimchemical properties of residual or unburned carbon obtaincd from fly ash were mestigated. The carbon-enrichcd samples were extracted from fly ash by flotalion mcthod. Tnz carbon content and chemical compos~lion of t b recovered carbon sample were analyzed. The ash in the carbon sample was also examined. The unburned carbon characterization included measurement oE sire distibution, sudace area, crystal shuchlre md density.

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Counter-measure for Reducing Residual Effects of Quinclorac to Followed-by Crops of Paddy Rice (답후작(沓後作)의 Quinclorac 잔류피해(殘留被害)에 대한 경감대책(輕減對策) 연구(硏究))

  • Kuk, Y.I.;Han, S.U.;Guh, J.O.
    • Korean Journal of Weed Science
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    • v.12 no.4
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    • pp.387-392
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    • 1992
  • For reducing the residual effects of Quinclorac to followed-by crops of paddy rice, three tests by different soil improvers, different cultural performances with tillage and application of composts, and cultivation of different depletion crops were evaluated, respectively. Among seven soil improvers, activated carbon, composts and perlite showed significant promisable feasibility to reduce phytotoxicity of tomato seedlings as affected by Quinclorac residuals, And comparing to untreated check, the application of tillage and composts prior to transplanting of tomato seedling could helpful to reduce Quinclorac residuals in the soil, but tomato and lettuce, most susceptible crops to Quinclorac, were not remarkably protected by those cultural performances. Also among cultivation of depletion crops just after rice harvest, Italian ryegrass, tall fescue, rape and oats engaged to deplete and reduce Quinclorac residuals for tomato seedling growth, however alfalfa and hairy vetch, relatively susceptible plants to Quinclorac were not promisable.

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