Colloidal pumping: evidence for the coagulation process using natural colloids tagged with 203Hg

Article Abstract:

Equilibrated, 203Hg-tagged colloids using water, particles and colloids from Galveston Bay and Trinity River were used to investigate the coagulation process. Radioisotopic Hg was transferred from the colloidal pool to the particulate pool. Partitioning of 203Hg to particles and colloids was found to be comparable or slightly higher than that noted for stable Hg in Galveston Bay. 203Hg was transferred from the colloidal to the particulate pool in all cases. This suggests that colloids function as an agent in the transfer and removal of Hg and potentially other trace metals in natural systems.

Galveston Bay, Coagulation

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Colloidal and particulate silver in river and estuarine waters of Texas

Article Abstract:

Majority of the conventional defined 'dissolved' silver in river and estuarine water of Texas is in colloidal size fraction of >/-1 kDa. This was determined in a measurement of the concentration and phase speciation of silver in selected rivers in the state and in the Trinity River estuary to establish the key factors affecting it in the aquatic environment. Specifically, 33% to 89% of the operationally defined dissolved silver fraction was present in colloidal form, indicating that it is associated with macromolecular organic matter.

Analysis, Texas, River sediments, Estuarine sediments, Silver

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Film straining of colloids in unsaturated porous media: conceptual model ad experimental testing

Article Abstract:

A quantitative, mechanistic model validates the film straining theory which states that the transport of suspended colloids can be controlled because of the physical restrictions imposed by thin water films in partially saturated porous media. Results indicate that the ratio of colloid size to film thickness and flow velocity influence the transport of colloids through water films. Hydrophobic colloids can still penetrate through unsaturated porous media provided the process is above the critical saturation value.

Models, Transport theory

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