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  • Dependence on sampling rates of Radiello((R)) diffusion sampler for BTEX measurements with the concentration level and exposure time.

Dependence on sampling rates of Radiello((R)) diffusion sampler for BTEX measurements with the concentration level and exposure time.

Talanta (2008-10-31)
Anne Pennequin-Cardinal, Hervé Plaisance, Nadine Locoge, Olivier Ramalho, Séverine Kirchner, Jean-Claude Galloo
ABSTRACT

Radiello((R)) diffusive samplers filled with a thermally desorbable adsorbent (graphitised charcoal Carbograph 4) have been tested for the monitoring of BTEX. The sampling rates have been estimated under various controlled atmospheres in order to evaluate the effects of two factors (exposure time, concentration levels and their interaction) on the performances of the Radiello((R)) sampler. Experiments have been carried out under various atmospheres in exposure chamber. A total of 174 Radiello((R)) samplers were exposed while varying two conditions: exposure time (1, 3, 7 and 14 days) and BTEX concentrations (low, medium and high levels). The results show that the sampling rates of benzene and toluene decrease for exposure of 14 days and especially for high concentration levels: decrease of 30% at 10mugm(-3) for benzene and 14% at 30mugm(-3) for toluene. To try to explain the variations of these sampling rates, the breakthrough volumes (V(B)) of BTEX on Carbograph 4 have been determined at different temperature and concentration conditions in order to evaluate the Langmuir parameters and their adsorption enthalpy (-DeltaH(ads)) using the Van't Hoff equation. With regard to these adsorption characteristics, the dependence of sampling rates with concentration level and exposure time were analysed and discussed.

MATERIALS
Product Number
Brand
Product Description

radiello 1,3-Butadiene Starter Kit, Thermal Desorption, pkg of 1 kit (2 RAD141 adsorbing cartridges and barcode labels, 1 RAD1202 yellow diffusive body, 1 RAD121 triangular support plate, 1 instruction sheet)
radiello Clips, suspending Radiello triangular support plate, pk of 20
radiello On-Field Thermometer, Includes one standard Radiello vertical adapter (RAD122) for each thermometer, configured for standard use, pk of 3
radiello Diffusive Bodies, white, configured for general use, pk of 20
radiello On-Field Thermometer, Reader, pk of 1
Supelco
radiello Methylene Blue Calibration Standard for H2S (Hydrogen Sulfide), pkg of 100 mL
radiello Empty Storage Tubes, glass (with stopper), volume 2.8 mL, pk of 100
radiello Diffusive Bodies, yellow, configured for reduced sampling rates, pk of 20
radiello Filtration Kit, pk of 20
radiello Diffusive Bodies, permeative, configured for anaesthetic gases and vapors, pk of 20
radiello BTEX/VOC Starter Kit, CS2 Desorption
radiello Empty Storage Tubes, polypropylene (with stopper), volume 12 mL, pk of 100
Supelco
radiello BTEX Calibration Kit (Thermal Desorption)
radiello BTEX/VOC Starter Kit, Thermal Desorption
Supelco
radiello BTEX Calibration Kit (CS2 Desorption)
radiello Hydrogen Sulfide Starter Kit
radiello Diffusive Bodies, blue, configured for sampling light sensitive compounds, pk of 20
radiello Outdoor Shelter, pk of 10
radiello Vertical Adapter, threaded for standard use, pk of 20
radiello Triangular Support Plate, pk of 20
radiello Barcode Labels, pk of 198
radiello Anesthetic Gases and Vapor Sampler
radiello Replacement Mounting Strips, for use with Radiello Outdoor Shelter, pk of 100
radiello Cartridge Adsorbents, for sampling Anaesthetic Gases/Vapors, matrix SS net with mix of mol sieve and activated charcoal (30-50 mesh), pk of 20
radiello Cartridge Adsorbents, for sampling BTEX and VOCs (thermal desorption), matrix SS net (3 x 8 μm, 4.8 mm diam.), Carbograph, pk of 20
radiello Cartridge Adsorbents, for sampling BTEX and VOCs (CS2 Desorption), matrix SS net (100 mesh, 5.8 mm diam.), activated with activated charcoal (30-50 mesh), pk of 20
radiello Cartridge Adsorbents, for sampling Ammonia (NH3), matrix microporous PE impregnated with phosphoric acid, pk of 20
radiello Cartridge Adsorbents, for sampling Aldehydes, matrix SS net with 2,4-DNPH coated FLORISIL®, pk of 20