[Application of NIR spectroscopy to multiple gas components identification].
Multiple gas components monitoring in situ by near infrared (NIR) spectroscopy is of great significance in the environmental monitoring. In the present paper, the apectral characteristics of the three types of the volatile organic compounds (VOCs)-propane, propylene and methylbenzene were analyzed, the linear relationship of propylene between concentration and absorbance was considered, and the NIR spectra from 1620 to 1750 nm including the characteristic absorption of the three VOCs were acquired, A linear regression model of chemical metrology was created by partial least-squares method and it predicted the concentration of propane and isobutene in the validation set. The results of the experiment indicated that NIR spectroscopy could easily, accurately and quantitatively determine the content of the multiple gas components, and can be used for monitoring the multiple components of the VOCs in situ.
Qi
Ru-bin
RB
State Key Lab of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China. qrb213@163.com
Yin
Xin
X
Yang
Li
L
Du
Zhen-hui
ZH
Liu
Jin
J
Xu
Ke-xin
KX
D000475:Alkenes / Q000032:analysis; D001554:Benzene / Q000032:analysis; D011407:Propane / Q000032:analysis; D019265:Spectroscopy, Near-Infrared / Q000379:methods*; D055549:Volatile Organic Compounds / Q000032:analysis*; D014835:Volatilization
D000475:Alkenes; D055549:Volatile Organic Compounds; C013658:propylene; D001554:Benzene; D011407:Propane