Environmental Factors

The accumulation of many pollutants in passive air samplers is influenced by factors such as changes in wind speed and temperature. For example, for a range of SOCs the rate of chemical exchange between the sampler and atmosphere is governed by the effective thickness of the air-side boundary layer under laminar flow conditions. An increase in wind speed can reduce the effective thickness of the boundary layer, resulting in higher rates of exchange and increased sampling rates 7 . If samplers...

Xad2

Short-term kinetic sampling (days weeks) or equilibrium sampling Short-long term integrative kinetic sampling (weeks-months) Long-term integrative kinetic sampling (weeks-years) Long-term integrative kinetic sampling (weeks-years) Low capacity, flexible, simple and fast to prepare simple clean-up methodology ability to manipulate equilibrium partitioning by varying the film thickness of EVA Medium-large capacity, cheap and easy to deploy, high spatial resolution and simple analytical clean-ups....

Sampling Of Metals

A Chemcatcher variant based on diffusion through a porous CA membrane to a receiving phase, where the analyte is removed by chelation in a chelating EmporeTM disk has been developed for monitoring metals 19 . Uptake rates to the receiving phase were determined in both batch and flow-through laboratory exposures for different metal ions. Sampling rates were found to be diffusion controlled and inversely related to pH. The uptake rate can be used for calculating the diffusion coefficients for...