[Study on the determination of NO, AsH3, COS and other impurities in cracked gas by chromatography/mass spectrometry method].
The selected ion monitoring(SIM) mode of capillary column gas chromatography coupled with mass spectrometry has been used for the determination of NO, AsH3, COS, thio-ether, thio-alcohol etc. in gases from catalytic cracking of heavy oils. The interference of CO, CO2, ethylene, ethane and N2 which affected the determination of NO was eliminated by chromatographic separation and subtraction of responses. The interference to the determination of selected ion was studied. Only C2H5SH was affected at m/z = 62 and the interference could be eliminated by using the ions at m/z = 47. The impurities in practical sample gas were determined. The detection limit of NO was 100 nL/L. The detection limits of other impurities were between 15 nL/L and 50 nL/L.
Zheng
Y J
YJ
College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, China. zyj@mail.qqhru.edu.cn
Li
Y J
YJ
Zhang
W B
WB
Lü
Z L
ZL