diffusion tube sampling Articles
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How Tubing Affects Particle Counts
Sample tubing and particle loss is affected by the following mechanisms: Diffusion Thermophoresis Sedimentation Turbulent inertial deposition Inertial deposition at tube bends Sample tube diameter Charged particle loss Sample size As you can see, there are a lot of mechanisms! The good news is that they have all been well studied and modeled to better help us understand how they can ...
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Sampling trace-level organic solutes with polymeric tubing. Part 2. Dynamic studies
Parker and Ranney present the results of laboratory tests focused on investigation the potential positive or negative biases associated with using polymetric tubing to collect groundwater samples. This paper, the second in a series, focuses on the effects under dynamic (i.e., pumping) conditions. They show that negative biases are a function of the plymer material, the hydrophobicity of the ...
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Residential Vapor Intrusion Evaluation: Long Duration Passive Sampling v. Short Duration Active Sampling
Abstract Sampling indoor air for potential vapor intrusion impacts using current standard 24-hour sample collection methods may not adequately account for temporal variability and detect contamination best represented by long-term sampling periods. Mr. Henry Schuver of the U.S. Environmental Protection Agency (EPA) Office of Solid Waste staled at the September 2007 Air & Waste Management ...
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Airparif uses Isatis to process 11 million+ mesh grids and generate daily air quality maps - Case Study
Isatis has been part of Airparif data processing workflow for 10+ years. The software is used daily to gather data and map air pollution over Paris area. The facts Airparif is part of the French AASQA network (“Associations Agréées de Surveillance de la Qualité de l’Air”). The AASQA are a French non-profit association accredited by the French Ministry of ...
By Geovariances
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