نتایج جستجو برای: passive samplers
تعداد نتایج: 72217 فیلتر نتایج به سال:
ORGANOHALOGEN COMPOUNDS – Volume 66 (2004) 138 Introduction Polyurethane foam (PUF) samplers are being used in an increasing number of studies to passively sample semivolatile organic compounds (SOCs) in the atmosphere (e.g. 1, ). However, recent research shows that the uptake and loss kinetics of passive air samplers is influenced by changes in wind speed . According to theory, the rate of che...
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 ...
This paper briefly reviews research on passive in situ samplers for aquatic environments but focuses on the development and application of the triolein-containing semipermeable membrane device in aquatic environmental monitoring. Special attention is paid to the calibration of the devices, quality control issues, and its potential uses in environmental assessments of aquatic contaminants. Also,...
Passive diffusive samplers were used to collect ambient benzene for a one-week sampling period (April 27 to May 4, 2011) at 11 locations throughout a city park in the Tampa, Florida, area. Concentrations were determined through gas chromatography with mass spectrometry. Spatial variability within the park and its contribution to uncertainty in health risk estimates were studied. Measured concen...
In this study we measured the total concentration of BTCs using grab water sampling, dissolved with passive samplers, and particle-bound fraction sedimentation traps in a Finnish inland lake. The sampling was conducted from May to September over two years. samples average MBT at sites varied between 4.8 13 ng L −1 , DBT 0.9–2.4 TBT 0.4–0.8 during first year 0.6–1.1 0.5–2.2 < LOD-0.7 seco...
Concentrations of neutral per- and polyfluoroalkyl substances (nPFAS) in the atmosphere are of interest because nPFAS are highly mobile percursors for perfluoroalkyl acids. Two calibration studies in Ontario, Canada and Costa Rica established the feasibility of using XAD 2-resin based passive air samplers (XAD-PAS) to reliably determine long term average air concentrations of nPFAS under temper...
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