Limestone characterization to model damage from acidic precipitation: effect of pore structure on mass transfer

Article Abstract:

An analysis of the pore size and pore area distributions of Salem limestone and their relationship to overall porosity reveals the influence of pore structure on flow characteristics and solute transport. Salem limestone shows a bimodal pore size distribution, where the larger pores function as routes for mass transfer of contaminants while smaller pores lead to high surface area adsorption and reaction sites. These complement permeability and capillary pressure measurements, which indicate high capillarity and low effective permeability to water. Using stone characterization, aqueous diffusion and convection were identified as primary transport mechanisms for pollutants.

Analysis, Limestone, Acid precipitation (Meteorology)

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Removal of selenocyanate in water by precipitation: characterization of copper-selenium precipitate by x-ray diffraction, infrared, and x-ray absorption spectroscopy

Article Abstract:

A characterization study was performed on the products formed from the extraction of selenium from process waters of seleniferous marine shales. Extraction was done by precipitating selenium with copper(II) salts and products were analyzed using x-ray diffraction, infrared and x-ray absorption spectroscopy techniques. Results from x-ray diffraction showed the incorporation of selenium in the copper thiocyanate lattice, while x-ray absorption spectroscopy showed selenium in the form of selenide, replacing sulphur in the copper thiocyanate structure.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Selenium, Clay and related minerals, not elsewhere classified, Clay and Ceramic and Refractory Minerals Mining, Shale Mining, Environmental aspects, Sewage, Selenium (Chemical element), Selenium compounds, Shales, Oil sands extraction plants, Shale oils

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Critical evaluation of a modified automatic wet-only precipitation collector for mercury and trace element determinations

Article Abstract:

The UM-B modified MIC-B automatic wet-only precipitation collector is useful in obtaining unadulterated mercury (Hg) and trace element samples. The apparatus, which was designed for the Lake Michigan Loading Study and other Great Waters projects, is more reliable than the bulk precipitation system. It has passed performance tests which included opening efficiency, collocated precision, spike recovery, field blanks, and bottle blanks. The UM-B collector performs best when proper preparation and ultra-clean collection techniques are observed.

Other Communications Equipment Manufacturing, Detection Equipment NEC, Evaluation, Detection equipment, Mercury, Mercury (Metal), Trace analysis, Precipitation (Chemistry), Lake Michigan, Detectors

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