Solubility of particulate cadmium sulfide at pH=1–14: A radiotracer study |
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| Authors: | S W F M Van Hövell Tot Westerflier J J M Binsma H N Stein C Vandecasteele |
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| Institution: | (1) Interuniversity Reactor Institute, Mekelweg 15, 2629 JB Delft, The Netherlands;(2) Department of Chemical Technology, Eindhoven University of Technology, P.O.Box 513, 5600 MB Eindhoven, The Netherlands;(3) Present address: State University of Ghent, Ghent, Belgium |
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| Abstract: | Cadmium sulfide particles were prepared by precipitation from acid solution. A radiotracer technique with109Cd was applied to measure the solubility of cadmium sulfide at various pH's. Filtration, centrifugation, ultracentrifugation, and dialysis were used to separate the particles from the solution. Only the last two techniques proved to be successful. The solubility of cadmium sulfide in water (pH=7) is found to be: 7.9·10–5 mol·l–1 in contrast with the literature value of 9.0·10–6 mol·l–1. At low pH (1–4), the solubility agrees fairly well with the solubility calculated on the basis of generally accepted values for the solubility product and for the various complex formation constants, while at high pH (4–14) the solubility is higher than expected. |
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