[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.
Institute for Environmental Health and Related Products Safety, Centers for Disease Prevention and Control, Beijing 100021, China.
Dongqun
D
Xu
Chenming
C
Liu
Aijun
A
Zhang
Xiaoyan
X
Dong
Keqin
K
Han
Guifang
G
Wang
Zhigang
Z
Tang
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