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KMID : 1059520200640060327
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Journal of the Korean Chemical Society
2020 Volume.64 No. 6 p.327 ~ p.333
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Performance Evaluation of a Portable GC for Real-time Monitoring of Volatile Organic Compounds
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You Dong-Wook
Seon Yeong-Sik
Oh Jun-Sik
Yi Bong-Yoon
Kim Hyun-Sik
Jung Kwang-Woo
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Abstract
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Performance of a portable GC that can be utilized for the real time determination of volatile organic compounds in air was evaluated. It employs purified/compressed ambient air as the carrier gas eliminating the need for high pressure gas tanks. The compact system with dimensions of 35 × 26 × 15 cm3 and weight of 5 kg is powered by either a 24 V DC external adapter or battery pack. Chromatograms of the mixture sample including benzene, toluene, ethylbenzene, and oxylene at concentrations of 1 ppmv and 20 ppmv represent a good reproducibility: 3.79% and 0.48% relative standard deviations (RSDs) for peak area variations; 0.40% and 0.08% RSDs for retention times. The method detection limit was 0.09 ppmv. A 30 m long, 0.28 mm I.D. column operated at an optimal condition yielded a peak capacity of 61 with good resolution for a 10 min isothermal analysis. The relative standard deviations (RSD) of the peak area variations and retention times during consecutive measurements over 27 h were less than 2.4%RSD and 0.5%RSD, respectively. Thus, this instrument makes it suitable for continuous and field analysis of low-concentration VOC mixtures in the indoor/outdoor environment as well as the spillage accident of hazardous chemicals.
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KEYWORD
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Portable GC, Reproducibility, Detection limit, Resolution, Volatile organic compounds
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