ppb-Level detection of benzene diluted in water with portable device based on bubbling extraction and UV spectroscopy

Ppt-Level Detection of Aqueous Benzene with a Portable Sensor Based on Bubbling Extraction and UV Spectroscopy

“…6). (Camou et al, 2008) First, the sensor exhibits a linear response in the 0.2 -3 ppmV range, which is more than one order of magnitude. This range may be extendible; however the high concentration range is not of much interest regarding the final application.…”

“…This chapter then describes the design of portable aqueous benzene sensor based on UVspectroscopy with a sensitivity in the pptV range. Starting from our portable BTX sensor dedicated to air monitoring (Ueno et al, 2001) , we extended its use to aqueous sample solution by adding an extraction module into the inlet to transfer the benzene compound from the liquid to the vapor phase (Camou et al, 2008). However, the concentration cell developed for the airborne system, which provides benzene concentration enhancement prior to the detection cell, could not be used.…”

“…However, the concentration cell developed for the airborne system, which provides benzene concentration enhancement prior to the detection cell, could not be used. As a consequence, the sensor demonstrated a LOD in the hundred ppbV range, several times higher than the requirements (Camou et al, 2008). Since the concentration stage is a key component for achieving high sensitivity, we developed a new one, taking into account the carrier gas specific properties after extraction, and demonstrated pptV range measurements.…”

Tetra-tert-butyl copper phthalocyanine-based QCM sensor for toluene detection in air at room temperature

“…Optimizations including higher sensitivity, lower detection threshold, better selectivity and reduced power consumption remain necessary to make them appropriate for such application. VOCs sensors based on UV-visible transduction have been also widely developed [16][17][18][19][20][21] because of their high level of discrimination of BTX gases as well as their low threshold of detection but suffer from a lack of portability and high cost. Surface Acoustic Wave (SAW) based sensors have been also investigated [22][23][24][25][26], their main drawbacks being their low resolution and high threshold of detection.…”

Földgázipari káros emisszió mérésére, optimalizálására alkalmas műszerek fejlesztése

“…Camou és munkatársai egy olyan eljárást fejlesztettek ki, mellyel 50 ppb a legkisebb kimutatható benzolkoncentráció vízben [64]. Az eljárás alapja az, hogy inert gázt buborékoltatnak át adott térfogatú folyadékmintán ("bubbling extraction") és ezt a gázt mérik UV spektroszkópiával.…”