TY - JOUR
T1 - Microtrap modulated flame ionization detector for on-line monitoring of methane
AU - Thammakhet, Chongdee
AU - Thavarungkul, Panote
AU - Brukh, Roman
AU - Mitra, Somenath
AU - Kanatharana, Proespichaya
N1 - Funding Information:
The authors would like to thank the Thailand Research Fund under the Royal Golden Jubilee Ph.D. Program for financial support and the Postgraduate Education and Research Program in Chemistry (PERCH) and Graduate School, Prince of Songkla University, Hat Yai, Thailand for its partial support.
PY - 2005/4/29
Y1 - 2005/4/29
N2 - A microtrap for on-line analysis of trace methane was developed. Silicosteel tubing, 15 cm long, 1.02 mm i.d. and 1.59 mm o.d. was packed with Carbosphere 80/100 mesh and placed between the standard gas source and the flame ionization detector (FID) to be used as a preconcentrator and an injector. The sample stream was passed continuously through the microtrap that was heated at a fixed interval by an electric pulse. To achieve the highest adsorption and desorption efficiency, parameters affecting the response of the system were optimized, and adsorption temperature in the range of 25 to -50°C was studied. The response from the microtrap as compared to that from direct-flame ionization detector was enhanced by as much as 260 times. The on-line microtrap system showed good linearity (r2 > 0.99), low detection limit (28.3 ppbv) and good long term stability (relative standard deviation, RSD of less than 5.0%). Therefore, this simple device is suitable for on-line analysis of trace methane and similar small molecules in the environment as in high purity gases.
AB - A microtrap for on-line analysis of trace methane was developed. Silicosteel tubing, 15 cm long, 1.02 mm i.d. and 1.59 mm o.d. was packed with Carbosphere 80/100 mesh and placed between the standard gas source and the flame ionization detector (FID) to be used as a preconcentrator and an injector. The sample stream was passed continuously through the microtrap that was heated at a fixed interval by an electric pulse. To achieve the highest adsorption and desorption efficiency, parameters affecting the response of the system were optimized, and adsorption temperature in the range of 25 to -50°C was studied. The response from the microtrap as compared to that from direct-flame ionization detector was enhanced by as much as 260 times. The on-line microtrap system showed good linearity (r2 > 0.99), low detection limit (28.3 ppbv) and good long term stability (relative standard deviation, RSD of less than 5.0%). Therefore, this simple device is suitable for on-line analysis of trace methane and similar small molecules in the environment as in high purity gases.
KW - Carbosphere
KW - High purity gases
KW - Methane
KW - Microtrap
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U2 - 10.1016/j.chroma.2005.03.041
DO - 10.1016/j.chroma.2005.03.041
M3 - Article
C2 - 15887494
AN - SCOPUS:17044416835
SN - 0021-9673
VL - 1072
SP - 243
EP - 248
JO - Journal of Chromatography A
JF - Journal of Chromatography A
IS - 2
ER -