Determination of Cu and Cd content of groundwater colloids by solid sampling graphite furnace atomic absorption spectrometry

Article Abstract:

Solid sampling graphite furnace atomic absorption spectrometry (GFAAS) is a reliable method of determining copper (Cu) and cadmium (Cd) in small samples of groundwater colloids. The application of GFAAS to determine the Cu and Cd content of standard reference materials, minerals and samples of aquifer colloids showed that Cu concentration in clay minerals was about 9-fold (in kaolinite) and 3-fold (in bentonite) higher than that obtained using nitric acid extraction. Average content of Cu and Cd declined by about 87% within a six-month period in aquifer colloids.

Usage, Water, Underground, Groundwater, Atomic absorption spectroscopy

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Colloid transport in geochemically heterogeneous porous media: modeling and measurements

Article Abstract:

A model which describes the transport and deposition of colloids in geochemically heterogeneous porous media is developed. The model yielded theoretical breakthrough curves using experimentally determined parameters, which compared quite favorably to experimental results. This underscores the importance of geochemically heterogeneous surfaces in determining the transport behavior of colloidal particles in heterogeneous aquatic environments.

Porous materials

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New method for sampling groundwater colloids under natural gradient flow conditions

Article Abstract:

A new approach for sampling groundwater colloids is presented. The multilayer sampler technique involves the use of dialysis cells that have large pore size membranes. These cells should be in dynamic equilibrium with the mobile colloid and liquid phases of groundwater. Laboratory and field studies using batch and flow experiments to evaluate the efficiency of this approach are presented.

Aquifers

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