Long-term changes in water and soil chemistry in spruce and beech forests, Solling, Germany

Article Abstract:

Long-term changes in bulk precipitation chemistry, soil and throughfall water and exchangeable base cations in the spruce and beech forests of Solling, Germany, were examined to identify the dynamics of the base cation chemistry of the soils. Results revealed that the forests' soils underwent acidification during the early 1970s as a result of SO4 deposition. SO4 levels, however, dropped after 1976 as industries cut emissions. Despite this, acidification persisted in the spruce forests' soil due to reduced deposition of calcium and magnesium. Beech soil, however, recovered.

Germany, Environmental aspects, Old growth forests, Soil acidification

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Convective transport of gases in moist porous media: effect of absorption, adsorption, and diffusion in soil aggregates

Article Abstract:

The comparison of four wetted solid matrix models to describe the convection, dispersion and mass transfer of gaseous chemical species and liquid-solid interface adsoption of the dissolved species are discussed. Mean retention time and concentration band variance were computed from the four models. These chromatographic processes were then applied to understand convective transport in partially saturated soils. It was found that the retardation of volatile chemical migration can be substantial even with very small soil-water content

Usage, Chromatography

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Membrane-based integrated absorption-oxidation reactor for destroying VOCs in air

Article Abstract:

A compact membrane-based integrated absorber-oxidation reactor was developed for the degradation of trichloroethylene (TCE) and other volatile organic compounds. The integrated absorber-oxidation reactor is composed of an ozonator, metering pump and a mountable electric power supply. The reactor is also composed of two sets of silicone capillaries and one set of Teflon microtubules. Furthermore, the membrane reactor degraded toluene by 97% under low VOC concentrations.

Biological Product (except Diagnostic) Manufacturing, Drugs, Bioreactors, Design and construction, Air filters, Chemical reactors

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