• Title/Summary/Keyword: 기체 크로마토그래피

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Gas-Liquid Chromatographic Determination of Haloxyfop-R and lts Methyl Ester Residues in Soils and Soybeans (토양과 대두중 Haloxyfop-R 및 Haloxyfop-R-methyl의 기체크로마토그래피를 이용한 잔류분석)

  • Lee, Young-Deuk
    • Korean Journal of Environmental Agriculture
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    • v.16 no.4
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    • pp.333-340
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    • 1997
  • An analytical method was developed to determine residues of haloxyfop-R and its methyl ester in soils and soybeans using gas-liquid chromatography (GLC) with electron capture detector (ECD). Soil or soybean sample was acidified and extracted with acetone. The extract was then subjected to ion-associated partition to individually separate haloxyfop-R and the neutral methyl ester. One phase containing haloxyfop-R was methylated with $BF_3$/methanol, partitioned to n-hexane and analyzed by GLC/ECD. The other phase containing the methyl ester was further purified by Florisil column chromatography prior to GLC determination. No cross contamination was found between two phases containing each of the acid and methyl ester, thus two compounds can be separately determined as the identical haloxyfop-R-methyl. Overall recoveries of haloxyfop-R from fortified samples averaged 88.2${\pm}$3.9% (n=12) and 88.3${\pm}$4.0% (n=6) for soils and soybeans respectively, and those of haloxyfop-R-methyl showed mean values of 89.2${\pm}$4.0% (n=12) and 85.6${\pm}$5.6% (n=6). Detection limits of both haloxyfop-R and its methyl esterwere 0.005㎎/㎏ and 0.01㎎/㎏ for soil and soybean samples respectively.

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Analytical Determination of Alkylphenols, Chlorophenols and Bisphenol A in Biota Samples using Gas Chromatography/Mass Spectrometry (기체 크로마토그래피/질량분석기를 이용한 생물시료 중 알킬 페놀류, 클로로페놀류 및 비스페놀 A의 분석법)

  • Hong, Jongki;Kim, Hyup;Baek, In-Girl;Kim, Do-Gyun;Seo, Jung-Joo;Seo, Jong-Bok;Chung, Bong-Chul;Pyo, Hee-Soo;Kim, Kyung-Rae;Kim, Yong-Hwa
    • Analytical Science and Technology
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    • v.13 no.4
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    • pp.484-493
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    • 2000
  • The simultaneous analysis of alkylphenols, chlorophenols and bisphenol A in biota samples was performed by gas chromatography-mass spectrometry-selected ion monitoring mode. The phenols were extracted from sample with organic solvent and Forisil and Silica columns for clean-up procedure were compared. Recovery studies were performed at 1-ppm level of phenols added to each biota sample. Their recoveries ranged between 83 and 116% with coefficient of variations of 2.4-11.9%. To improve the detection limits of phenols, trimethylsilyl (TMS) derivatization was applied. The gas chromatographic properties of free phenols and TMS derivatized phenols were also investigated.

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Determination of Capsaicin, Dihydrocapsaicin and Nonivamide by Gas Chromatography (기체크로마토그래피에 의한 캡사이신, 디하이드로캡사이신 및 노니바마이드(PAVA)의 정량)

  • Kim, Sang-Soo;Yoon, Joong-Soo
    • Journal of the Health Care and Life Science
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    • v.9 no.1
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    • pp.141-146
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    • 2021
  • Determination of capsaicin, dihydrocapsaicin and nonivamide in pungent liquids of self-defense spray were studied. The nonivamide having almost same spicy taste with capsaicin have been containing a few amounts in natural products, it had called as synthetic capsaicin or PAVA, have used to flavorings for foodstuffs and incapacitating agents of riot controls. Nowadays, it has been occasionally found that the quality controls of a self-defense sprays were not properly due to flood of illegal self-defense sprays. Thus, the simple analytical method with gas chromatography is developed, it is identified whether the products which have contained synthetic capsaicin were marked like natural materials as well as the pungent ingredients in it obeyed with permissible concentration to human or not was investigated. Finally, the pungent components and amounts in some kinds of self-defense spray were investigated.

Qualitative analysis of some kinds of petroleum (thinner, gasoline, kerosene, and diesel oil) by gas chromatography (기체 크로마토그래피를 이용한 몇 가지 석유류(시너, 휘발유, 등유 및 경유)의 정성분석)

  • Hyun, Joon-Ho;Park, Jong-Heon;Kim, Sang-Soo;Choi, Jong-Moon
    • Analytical Science and Technology
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    • v.19 no.6
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    • pp.512-518
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    • 2006
  • The evidence containing some kind of petroleum at the fire spot was analyzed by gas chromatography to identify a fire's sources. To extract some petroleum from fire evidence, 10.0 mL of n-hexane was added in this solution, and it was shaken for 30 minutes. To identify a kind of petroleum in fire evidence, the prepared n-hexane solution was injected and analyzed in the gas chromatograph. The chromatogram of sample was different from those of thinner and gasoline that have low boiling point, and shown different peak pattern to heating and boiler oils. But it was similar to the chromatogram of diesel oil. After small amount of diesel oil was added to the sample, the area of characteristic peaks was increased more than those of raw sample. From the results, the kind of petroleum in the fire evidence was diesel oil.

Separation of Non-Volatile Compounds Unsuitable for GC Using Supercritical Fluid as Mobile Phase (초임계 유체를 이동상으로 사용함으로써 기체 크로마토그래피로 분리하기 힘든 비휘발성 화합물들의 분리)

  • Pyo, Tong Jin;Kim, Hoon Ju
    • Analytical Science and Technology
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    • v.5 no.2
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    • pp.153-158
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    • 1992
  • In this work, we developed supercritical fluid chromatographic methods for the samples which are difficult to analyze with conventional GC or HPLC. Long-chain Hydrocarbons, mink oils and soybean oils unsuitable for GC because of their low volatility or limited thermal stability were separated by SFC due to the high solvating properties of supercritical carbon dioxide fluids. In our research, a new method for the analysis of polar fatty acids and pesticides was developed. This method should be used to overcome problems with polar samples in SFC.

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Effects of Temperature on the Coking Characteristics of Kerosene (케로신 연료의 침탄 특성에 대한 온도의 영향)

  • Kim, Min Cheol;Kim, Yeong Jin;Kim, Jeong Soo
    • Journal of the Korean Society of Propulsion Engineers
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    • v.23 no.2
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    • pp.46-52
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    • 2019
  • This research was conducted to analyze the effects of temperature on coking characteristics of kerosene. The kerosene was heated to 600 K, 700 K, and 800 K, and the cooled samples were collected. The used copper tubes were replaced according to the temperature conditions. The liquid and copper specimens were analyzed by gas chromatography-mass spectrometry and scanning electron microscopy equipped with an energy dispersive x-ray spectrometer, respectively. The results of the analysis confirmed that a carbon deposit was formed from the coking of fuel on the inner surface of the copper specimen at a relatively high temperature (800 K) of the copper tube.

Studies on the Simultaneous Analysis of Organochlorine Pesticide Residues by Gas-Liquid Chromatography (I). Solvent Extraction and Cleanup of Pesticides (기체-액체 크로마토그래피에 의한 잔류 유기염소제 농약들의 동시 분석에 관한 연구 (제1보). 농약의 용매추출 및 불순물 제거)

  • Taek-Jae Kim;Song-Ja Park;Young-Sang Kim
    • Journal of the Korean Chemical Society
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    • v.29 no.5
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    • pp.496-502
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    • 1985
  • The solvent extraction and cleanup processes for the simultaneous gas-liquid cliromatographic determination of 16 kinds of organochlorine pesticide residues were investigated. The pesticides were extracted out from-various crops with the aqueous acetone solution acidified (pH < 1.5) by adding conc. $H_3PO_4$. Most of the pesticides were partitioned from the solution with petroleum ether. Evaporated the extracting solvent, the residues were dissolved in ethylether-petroleum ether (6 : 94) eluent and eluted through the Florisil column activated at 650$^{\circ}$C for 2.5hrs. The extraction efficiency was over 94% and impurities were effectively removed by the column chromatography.

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Determination of bisphenol-A using GC/MS in Can Materials (기체크로마토그래피/질량분석법을 이용한 캔 물질에서의 bisphenol-A 분석)

  • Kim, Ki-Cheol;Kim, Yang-Hee;Choi, Ok-Kyung;Ko, Hoan-Uck;Yim, Jun-Rae;Choi, Kyo-Hong;Cho, Hyun-Woo;Kim, Hye-Young;Kim, Myungsoo;Myung, Seung-Woon
    • Analytical Science and Technology
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    • v.14 no.6
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    • pp.499-503
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    • 2001
  • A new simple, rapid and sensitive gas chromatographic technique for the determination of bisphenol-A in can materials, which is the major material of epoxy resin and polycarbonate polymer, is proposed. This method is characterised by derivatization of the bisphenol-A with a acylating reagent forming the acetate derivative to optimize the chromatographic property. The detection of bisphenol-A is performed based on GC/MS (gas chromatography/mass spectrometry). Several beverages were analyzed by the proposed method for the determination of bisphenol-A Bisphenol-A was assayed the range of $0.11{\sim}11.40{\mu}g/can$ from the can materials.

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Studies on Ozonation of Nicotine (니코틴의 오존화 반응에 관한 연구)

  • Taek-Kyu Park;Ki-Hwan Kim;Tae-Sung Huk
    • Journal of the Korean Chemical Society
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    • v.28 no.5
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    • pp.323-327
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    • 1984
  • Nicotine was reacted with an equimolar amount of ozone in methylene chloride and distilled water. The reaction mixture was separated by column chromatography or thin layer chromatography and then purified by vacuum distillation. The six compounds obtained from this reaction were characterized by NMR, IR and Mass spectrometry. These were identified as unchanged nicotine, nornicotine, anabasine, ${\beta}$-nicotyrine, cotinine and nicotine-N-oxide. From these results, reaction mechanism for the ozonolysis ofon nicotine was proposed; the pyrrolidine ring is attacked by ozone at the 1'-position followed by further transformation.

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