Development and optimization of a mid-infrared hollow waveguide gas sensor combined with a supported capillary membrane sampler.
A gas sensor for application in water analysis was developed by combination of a mid-infrared (MIR) hollow waveguide with a Fourier transform infrared (FT-IR) spectrometer and coupling of the hollow waveguide gas sensor module to a supported capillary membrane sampler (SCMS) for continuous liquid-gas extraction. Different hollow waveguides have been characterized in this study for developing an optimized optical configuration. Analysis of industrially relevant compounds has been performed, investigating chlorinated hydrocarbons (CHCs), such as dichloromethane and chloroform, representing highly volatile analytes, and 1,4-dioxane as an example of target compounds with low volatility. The suitability of this spectroscopic IR sensing system for industrial applications is demonstrated under simulated real-world conditions with limits of detection in the ppb (v/v) and ppm (v/v) concentration range for CHCs and 1,4-dioxane, respectively.
de Melas
Fabiano
F
Vienna University of Technology, Institute of Analytical Chemistry, A-1060 Vienna, Austria.
Pustogov
Viktor V
VV
Croitoru
Nathan
N
Mizaikoff
Boris
B
D004146:Dioxanes / Q000032:analysis* / Q000737:chemistry; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000032:analysis* / Q000737:chemistry; D006843:Hydrocarbons, Chlorinated / Q000032:analysis* / Q000737:chemistry; D008567:Membranes, Artificial; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D017550:Spectroscopy, Fourier Transform Infrared / Q000295:instrumentation* / Q000379:methods; D014159:Transducers; D014867:Water / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
D004146:Dioxanes; D005740:Gases; D006843:Hydrocarbons, Chlorinated; D008567:Membranes, Artificial; D014874:Water Pollutants, Chemical; D014867:Water; C025223:1,4-dioxane