A radiotracer study of cadmium transport across the CdS/aqueous solution interface

Information on interfacial mass transport of cadmium in cadmium sulfide suspensions and er equilibrium conditions has been obtained by probing with a radiotracer for cadmium. The transport of Cd2+ ions from the cadmium sulfide solid particles to the saturated solution and visa versa is followed by adding radioactive 109Cd2+ to the solution and measuring the amount of radioactivity present in the solution as a function of time. The amount of exchangeable cadmium in or at the solid/liquid interface, which is deduced from the final value of radioactivity in the solution appeared to be 1.8 to 2.3 times the amount of cadmium in one lattice layer. Compartmental analysis of the experimental data revealed that 4 different cadmium species are involved in the exchange processes, one of which being the cadmium in the bulk of the solution, and another one, representing 40% to 50 of one lattice layer, which exchanges rapidly with the solution in comparison with the other two species left

Magnesium transport across the basolateral plasma membrane of the fish enterocyte

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Uptake, distribution and excretion of magnesium in Oreochromis mossambicus: dependence on magnesium in diet and water

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Calcium pump activities in the kidneys of Oreochromis mossambicus

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Physiological effects of low-magnesium feeding in the common carp, Cyprinus carpio

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Crystal structure and texture of H2S-precipitated cadmium sulfide

Polycrystalline and predominately mixed-phase CdS particles are obtained by H2S precipitation from acidic cadmium solutions with various concentrations of SO42-, ClO4-, NO3-, and/or Cl-. None of the precipitates is free of interstitial (void) space. The roughness of the particle surface increases with the number of crystallites in one particle. Chloride is shown to play an exceptional role in the precipitation: (i) Chloride promotes the formation of hexagonal CdS, while in the presence of the other anions the cubic phase predominates at low supersaturation or anion concentration. The fraction of hexagonal CdS increases with the concentration of anions present in the precipitation media. The higher the complex formation constant between the anion and Cd2+, the stronger this effect proves to be. (ii) Chloride promotes the formation of more particles and inhibits the aggregation of crystallites into one single particle. (iii) Chloride is present in considerable amounts, mainly at grain boundaries inside the particles, while sulfate and perchlorate are adsorbed mainly at the particle surface

Magnesium transport between carp and water studied with 28Mg2+ as radiotracer

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