Journal
ANALYTICA CHIMICA ACTA
Volume 887, Issue -, Pages 172-178Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2015.07.021
Keywords
Zeeman-effect spectrometry; Benzene determination; Mercury determination; Ambient air analysis; Natural gas analysis; Isotope light sources
Categories
Funding
- European Social Fund grant within the project Elaboration of Innovative Functional Materials and Nanomaterials for Application in Environment Control Technologies [1DP/1.1.1.2.0/13/APIA/VIAA/30, 2013/0027/1DP/1.1.1.2.0/13/APIA/VIAA/007]
- Lumex Instruments Company
Ask authors/readers for more resources
A new analytical portable system is proposed for the direct determination of benzene vapor in the ambient air and natural gas, using differential absorption spectrometry with the direct Zeeman effect and innovative radiation sources: capillary mercury lamps with different isotopic compositions (Hg-196, Hg-198, Hg-202, Hg-204, and natural isotopic mixture). Resonance emission of mercury at a wavelength of 254 nm is used as probing radiation. The differential cross section of benzene absorption in dependence on wavelength is determined by scanning of magnetic field. It is found that the sensitivity of benzene detection is enhanced three times using lamp with the mercury isotope 204Hg in comparison with lamp, filled with the natural isotopic mixture. It is experimentally demonstrated that, when benzene content is measured at the Occupational Exposure Limit (3.2 mg/m(3) for benzene) level, the interference from SO2, NO2, O-3, H2S and toluene can be neglected if concentration of these gases does not exceed corresponding Occupational Exposure Limits. To exclude the mercury effect, filters that absorb mercury and let benzene pass in the gas duct are proposed. Basing on the results of our study, a portable spectrometer is designed with a multipath cell of 960 cm total path length and detection limit 0.5 mg/m(3) at 1 s averaging and 0.1 mg/m(3) at 30 s averaging. The applications of the designed spectrometer to measuring the benzene concentration in the atmospheric air from a moving vehicle and in natural gas are exemplified. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available