[Tenax TA adsorption/thermal desorption/capillary gas chromatography for monitoring BTX in the ambient air].
OBJECTIVE
A method for monitoring low concentration of benzene, toluene, p-xylene, o-xylene (BTX) in ambient air is set up. The optimum of desorption and analysis parameter is selected.


METHODS
Tenax TA adsorption/thermal desorption/capillary gas chromatography is used.


RESULTS
The relative standard deviation of benzene, toluene, p-xylene, o-xylene in ambient air are from 4.30% to 10.81%, which shows this method has good repeatability. The recoveries of BTX are more than 94%. The minimum detectable concentration to benzene, toluene, p-xylene, o-xylene is 0.09, 0.12, 0.23, 0.26 microg/m3 respectively.


CONCLUSIONS
This method can be used to determinate low concentration of BTX in ambient air.
Xu
Dongqun
D
Institute for Environmental Health and Related Products Safety, Centers for Disease Prevention and Control, Beijing 100021, China.
Liu
Chenming
C
Zhang
Aijun
A
Dong
Xiaoyan
X
Han
Keqin
K
Wang
Guifang
G
Tang
Zhigang
Z
D000327:Adsorption; D000393:Air Pollutants / Q000032:analysis*; D001554:Benzene / Q000032:analysis*; D002849:Chromatography, Gas / Q000379:methods*; D015203:Reproducibility of Results; D014050:Toluene / Q000032:analysis*; D014992:Xylenes / Q000032:analysis*
D000393:Air Pollutants; D014992:Xylenes; D014050:Toluene; D001554:Benzene