Sampling Efficiency of Organic Vapor Passive Samplers by Diffusive Length

Sampling medium side resistance to uptake of semivolatile organic compounds in passive air samplers.

Current theory of the uptake of semivolatile organic compounds in passive air samplers (PAS) assumes uniform chemical distribution and no kinetic resistance within the passive sampling media (PSM) such as polystyrene-divinylbenzene resin (XAD) and polyurethane foam (PUF). However, these assumptions have not been tested experimentally and are challenged by some recently reported observations. To...

TOLUENE Method number: Matrix: Target concentration: OSHA PEL: ACGIH TLV: Procedure: Recommended sampling parameters: Adsorbent tubes Sampling rate: Sampling time: Diffusive samplers Exposure time: Reliable quantitation

Adsorbent tube samples are collected by drawing workplace air through either coconut shell charcoal or Anasorb 747 tubes with personal sampling pumps. Diffusive samples are collected by exposing either 3M 3520 Organic Vapor Monitors (OVMs) or SKC 575-002 Passive Samplers to workplace air. Samples are desorbed with 60/40 (v/v) N,N-dimethylformamide/carbon disulfide (DMF/CS2) and analyzed by gas ...

Modeling the uptake of semivolatile organic compounds by passive air samplers: importance of mass transfer processes within the porous sampling media.

Air sampling based on diffusion of target molecules from the atmospheric gas phase to passive sampling media (PSMs) is currently modeled using the two-film approach. Originally developed to describe chemical exchange between air and water, it assumes a uniform chemical distribution in the bulk phases on either side of the interfacial films. Although such an assumption may be satisfied when mode...

Monitoring of Aquatic Environments Using Passive Samplers

A review is given on the development of passive samplers for aquatic environments. Passive samplers that are simple and easy to use and with minimal consumption of organic solvents to desorb the analytes from the trapping media are focused. New developments in quality assurance procedures are highlighted.

Guidelines for passive sampling of hydrophobic contaminants in water using silicone rubber samplers