• Title/Summary/Keyword: GC-FPD

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A Rapid and Convenient Method for the Determination of Fatty Acid by Gas Chromatography-Flame Photometric Detector (가스크로마토그라피-염광광도검출기를 이용한 지방산의 신속간편한 정량)

  • 조영현;박만기;이숙연
    • YAKHAK HOEJI
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    • v.29 no.5
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    • pp.227-233
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    • 1985
  • A new method of determination of fatty acid using gas chromatography-flame photometric detector (GC-FPD) is described. Fatty acid was methylthiomethyl-esterified with methylthiomethy chloride in 1,8-diazabicyclo [5,4,0]-undec-7-ene catalyst and its concentration measured by GC-FPD with 3%OV-1 or 3% FS-1 column. The FPD responses of thirteen fatty acid methylthiomethyl esters were examined and were proportional to the concentration of the esters without regard to their chemical structures. Consequently it was possible to determine various fatty acid using one standard calibration curve by GC-FPD. We could rapidly and conveniently determine varous fatty acids using one standard calibration curve by GC-FPD. We could rapidly and conveniently determine 13 fatty acids in Ginseng Radix alba by this method.

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Studies on Pretreatment for Analysis of Pesticides by Using HPLC and GC (HPLC 및 GC에 의한 농약분석에서 전처리에 대한 연구)

  • Oh, Bo Young;Bae, Jun Hyun;Kang, Jun Gil;Kim, Youn Doo
    • Journal of the Korean Chemical Society
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    • v.43 no.6
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    • pp.663-669
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    • 1999
  • For determination of separated pesticides by using GC and HPLC, liquid-liquid extraction(LLE) and solid phase extraction(SPE) have been carried out to separate and concentrate the organophophorous pesticides such as Diazinon, Fenitrothion, Phosmet, Phosalon and EPN in environmental water samples. ln determination of pesticides by HPLC/UV, SPE has resulted in higher recovery and more precision than LLE, while in determination of pesticides by GC/FPD, vice versa. HPLC/UV after the pretreatment process of sample by solid phase extraction (SPE-HPLC/UV) has suggested the possibility of determination of pesticides ppb level. ln comparison of detection limit, both SPE-HPLC/UV and LLE-GC/FPD are reasonably suitable for analysis of residue pesticides. ln the respect of the rapidity and the solvent required, SPE-HPLC/UV method has proven to be superior to LLE-GC/FPD.

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Determination of $\beta$-Lactam Antibiotics by Gas Chromatography with Flame Photometric Detector (I) (GC/FPD를 이용한 $\beta$-락탐계 항생물질의 분석(I))

  • 박만기;조영현;양정선
    • YAKHAK HOEJI
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    • v.28 no.1
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    • pp.25-27
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    • 1984
  • Some $\betha$-lactam antibiotics-penicillins and cephalosporins-were determined by gas chromatography (GC) with flame photometric detector (FPD) which was selective and sensitive to sulfur-containing compounds. Methyl ester derivatives of carboxyl group in $\betha$-lactam antibiotics were prepared using 0.5Mmethyl iodide in methylene chloride and were taken for gas chromatography with 0.9% or 0.6% QF-1 on Chromosorb WAW-DMCS. We have found that it is possible to determine methyl esters of $\betha$-lactam antibiotics by GC/FPD.

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Determination of Carboxyl Drugs by Gas Chromatography-Flame Photometric Detector (가스크로마토그라피-염광광도 검출기에 의한 혈장중 카르복실기 함유 약물의 정량)

  • 박만기;조영현;유무영;강탁림
    • YAKHAK HOEJI
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    • v.30 no.4
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    • pp.180-184
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    • 1986
  • Such carboxyl drugs as mefenamic acid, alclofenac, ketoprofen, cicloxilic acid and tolfenainic acid in rat plasma were determined by the gas chromatography flame photometric detector (GC-FPD). After methylthiomethyl (MTM) esterification with MTM-chloride in 1, 8-diazabicyclo [5.4.0] undec-7-ene (DBU) catalyst, determination of these drugs by this method was tried and compared with that by the GC-flame ionization detector (FID) method in respect to sensitivity and effect of inteferences. The results showed it was possible to analyze with accuracy by this method because of specificity of the FPD, although these drugs were not separated from interferences in plasma on GC column. The GC-FPD method was more sensitive than GC-FID method and the minimum detectable amount of monocarboxylic drugs on 3%, QF-1 column was about 15fmol/injection.

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Determination of Volatile Organic Compounds emitted from Municipal Solid Waste Landfill Site by Thermal Desorption-Cryofocusing-GC/FID/FPD (열탈착-저온농축-GC/FID/FPD에 의한 도시 생활폐기물 매립장에서 방출되는 휘발성 유기화합물의 측정에 관한 연구)

  • Kim, Man-Goo;Jung, Young-Rim;Seo, Young-Min;Nam, Sung-Hyun;Kwon, Young-Jin
    • Analytical Science and Technology
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    • v.14 no.3
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    • pp.274-285
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    • 2001
  • In this study, the thermal desorption-cryofocusing-gas chromatographic(TD-C-GC) method was developed for determination of volatile organic compounds(VOCs) in ambient air and was applied at the municipal solid waste landfill sites. On-column cryofocusing was possible only with a 100 ml dewars bottle in TD-C-GC method with a stainless steel column. However, high operating pressure was needed for purging VOCs from the absorbent trap, which was able to solve by pressure programming with a electric pressure controller. By using both pressure and temperature programming brought increasing of resolution power in on-column cryofocusing method, but the high pressure caused a leakage of sample tube with repeated use. A loop cryofocusing devise was also developed and compared with the direct on-column method. In loop cryofocusing method, VOCs were concentrated on a 0.8mm i.d. loop which is located between the injector and separation column by using liquid nitrogen. In order to purge VOCs from the absorbent trap, only 0.4 psi of pressure was need in the loop cryofocusing method. Dual detection system was applied for the analysis of VOCs; a FID was used for hydrocarbons and a FPD was used for sulfur-containing compounds. Qualitative analysis was done by on-column cryofocusing GC-MS system. Among the large number of VOCs, toluene was the most abundant. Hydrogen sulfide, dimethyl sulfide, carbon disulfide, dimethyl disulfide and methyl propyl disulfide were detected at landfill site by FPD.

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Determination of Major Reduced Sulfur Gases Emitted from Wastes Stored in Environmental Facility Using GC/FPD (GC/FPD를 이용한 환경기초시설 폐기물의 대기중 황계열 악취물질 배출특성에 관한 연구)

  • Lee, Taeyoon;Lee, Jeakeun;Lee, Junki
    • Journal of the Korean GEO-environmental Society
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    • v.10 no.2
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    • pp.37-43
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    • 2009
  • With the economic development of Korea, sewage treatment facilities and waste food treatment facilities have been steadily increased. These facilities have positive effects such as the conservation of the water resources quality and waste food recycling while they also affect the neighborhood life with severe odor problems. Therefore, it was first collected sludge samples from 5 sewage treatment facilities and 5 waste food treatment facilities where the amounts of waste produced from above sites are relatively immense in Busan and estimate the $H_2S$ emission rates. Then it was selected 1 sample which has the highest emission rate of $H_2S$. Using flux chamber and GC/FPD analyses, it was tried to quantify the emitted amount of sulfonic gas concentration under anoxic condition. The sludge sample obtained from Noksan sewage treatment facility has the highest emission rate of $H_2S$. This sample contained 156.18 mg/kg $H_2S$. The odor compounds were analyzed using GC/FPD and the concentrations were converted to odor quotient. Among odor compounds the ratio of $CH_3SH$ (methylmercaptan) for the total odor quotient was 47.3% and considered to be the main odor compound in the sample.

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Development of an Analytical Approach to Measure Volatile Sulfur Compounds Using a Non-Cryogenic Preconcentration Method (비냉각형 선농축 방식에 의한 대기 중 휘발성 황화합물의 분석방법 개발)

  • 김기현;이강웅
    • Journal of Korean Society for Atmospheric Environment
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    • v.13 no.5
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    • pp.355-360
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    • 1997
  • The atmospheric concentration of dimethylsulfide (DMS), known as the predominant volatile organic. sulfur compound, is determined at subnanogram level by a combined application of non-cryogenic preconcentration method and gas chromatography with flame photometric detection (GC/FPD). The volatile DMS in air is preconcentrated using a trapping tube containing adsorbent like Molecular Sieve 5A (or gold-coated sands). The tube is then connected to the GC/FPD system via a six-way rotary valve, thermally desorbed at 40$0^{\circ}C$, separated on OV101 column, and detected by a flame photometric detector. The DMS peak elutes at about 2.5 mins and is integrated electronically. The analytical precision, if expressed in terms of relative standard error, is around 5%. The detection limit of our GC/FPD system is ca 1 ng of DMS. Details of our analytical system are presented.

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Determination of Ephedrine Hydrochloride and its Analogs by GC-FPD (GC-FPD를 이용한 염산에페드린 및 그 관련물질의 정량)

  • 박만기;조영현;이용문;노일협
    • YAKHAK HOEJI
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    • v.30 no.5
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    • pp.214-219
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    • 1986
  • A gas chromatographic procedure is described for the quantitative analysis of ephedrine hydrochloride, pseudoephediiiie hydrochloride and norephedrine hydrochloride in pharmaceutical preparations. The procedure was based upon the determination of thioureas formed from amines and phenylisothiocyanate. The recoveries of ephedrine, pseudoephedrine and norephedrine from pharmaceutical preparations were 100.7(S.E. 0.9), 99.5(0.8), 99.1(0.8) and 99.1%(O.9), respectively. The high accuracy and precision of this assay were inherent in the flame photometric detectors normally used in gas chromatography.

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A Study on the Distribution of Atmospheric Concentrations of Sulfur Compounds by GC/FPD (GC/FPD에 의한 대기 중 황화합물 농도분포에 관한 연구)

  • Yang, Sung Bong;Yu, Mee Seon;Hwang, Hee Chan
    • Analytical Science and Technology
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    • v.16 no.3
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    • pp.240-248
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    • 2003
  • Sulfur compounds which are well-known odor-active compounds in industrial area have very low detection threshold values. Trace amounts of volatile sulfur compounds in enviroment air around several odor sources were concentrated in liquid argon bath and determined by gas chromatograph with flame photometric detector (FPD) which exhibits very good selectivity and sensitivity. 25% ${\beta}$,${\beta}$-Oxydipropionitrile on 60/80 Chromosorb W was used as adsorbent for the preconcentration of sulfur compounds in air sample and also as packing material for a packed glass column. Concentration volume of air sample was different from place to place in the range of 0.1~3.0L. Atmospheric concentrations of sulfur compounds in air of residential districts and boundaries of business establishments, and also those in the exhausted gases of emission points such as a sewage disposal plant in industrial area were measured.

Determination of Sulfur-Containing Odorants in Natural Gas by Gas Chromatography/Flame Photometric Detection (GC/FPD에 의한 천연가스 중 황 함유 부취제의 정량)

  • Choi, Yong-Wook;Kim, Jong-Hun;Choe, Kun-Hyung;Shin, Sung-Sik
    • Analytical Science and Technology
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    • v.7 no.3
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    • pp.349-359
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    • 1994
  • A gas chromatographic method for analyzing the gas odorants concentration in natural gas was studied. Eight odorants involving TBM and THT were completely separated by using OV-10 column. The optimization of several interrelated key parameters affecting the response of FPD such as hydrogen flow rate, air flow rate and detector temperature were accomplished. A permeation device was used to obtain calibration curves of TBM and THT. This analytical method has applied to measure TBM and THT used as a natural gas odorant blend in natural gas pipeline. In order to elucidate the relationship between odor level and odorant level feasibility test of fragrance meter was demonstrated.

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