In situ measurement of offective vapor-phase porous media diffusion coefficients

Article Abstract:

A procedure for measuring the effective vapor-phase porous medium diffusion coefficient (Dv,eff) in situ, considers transient changes in volume-averaged concentrations of an inert tracer gas, instead of changes in point concentration measurements. In addition, measurements are made over intermediate time frames, specifically minutes to hours, and the process is easily modified to probe scales ranging from approximately 0.1 m to 1 m. This procedure may prove valuable for many applications, including risk-based volatilization and vapor migration calculations and remediation performance estimates.

Comment:

An alternative procedure for measuring the effective vapor-phase porous medium diffusion coefficient in situ is presented

United States, Nonmanufacturing technology, Particulate Pollutants, Article

---

Long-term trends of particulate mutagenic activity in the atmosphere of Sapporo. 1. Determination of mutagenic activity by the conventional tester strains TA98 and TA100 during an 18-year period (1974-1992)

Article Abstract:

Ames Salmonella mutagenicity bioassay experiments raise questions on the use of benzo(a)pyrene's (BaP) as a long-term indicator of air pollution effects on human health. Experiments were conducted in Sapporo during an 18 year period using TA98 and TA100 and results show that there was almost no change in the exposure to the amount of mutagenic substances as a whole despite BaP reductions of 25% to 20% and indirect mutagenic activity reductions of 66% to 50%.

All Other Petroleum and Coal Products Manufacturing, Misc Gaseous Pollutants, Coal Tar & Derivatives NEC, Health aspects, Japan, Air pollution, Gaseous pollutants, Benzopyrene, Mutagenicity testing, Mutagenicity tests, Coal tar products

---

Similar abstracts:

• Abstracts: Nonlinear properties of high strength paperboards. In situ measurement of the Young's modulus of an embedded inclusion by acoustic microscopy
• Abstracts: Aircraft measurements of the concentration and flux of agrochemicals. Evidence for the heterogeneous formation of nitrous acid from peroxynitric acid in environmental chambers
• Abstracts: Real-time measurement of correlated size and composition profiles of individual atmospheric aerosol particles
• Abstracts: The Internet of Tomorrow. Research, education, and America's future. Power plants or candle factories?
• Abstracts: Influence of strain rate and temperature on the radial compression behavior of wet spruce. Rate data and material model parameter estimation

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.