New Low Cost Method for Sampling Svocs in Ambient Air
Jan 01 2000
SVOCs in ambient air are typically measured using active samplers which require expensive equipment, a secure site, power and trained operatives. Until now such measurements have therefore been relatively expensive. The new passive samplers offer many advantages which include simplicity, lower cost, versatility and the capability of being deployed in many locations concurrently.
The samplers have been designed and calibrated to allow reliable estimates of air concentrations to be made, or to allow semiquantitative comparisons of the levels and patterns of SVOCs. Several designs have been developed which can integrate ambient concentrations over time scales as short as hours and as long as years. The shorter timescales facilitate studies of contaminant dispersal, fluxes and transport processes and can provide data for dispersion and transport modelling. Longer timescales allow source/sink regions to be identified and underlying trends in ambient levels to be investigated.
More recent developments of the passive sampler have provided not only concentration data but also directional information which will yield invaluable data for source apportionment.
The simple and versatile design of passive air samplers provides a wide range of possible applications including background air measurements, indoor air quality assessments, occupational hygiene studies, within site boundary investigations and spatial surveys around point sources.
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