SOLUBILITY OF PARTICULATE CADMIUM SULFIDE AT pH = 1-14: A RADIOTRACER STUDY

Cadmium sulfide particles were prepared by precipitation from acid solution. A radio-tracer technique with 109Cd was applied tomeasure the solubili W of cadmium sulfide at various pH's. Filtration, centrifugation, ulttacentrifugation, a d dialysis were used to sepa-rate 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- a tool 9 1-1 in contrast with the literature value of 9.0. 10-a tool. 1- ~. At low pH (1-4), the solubility agrees fairly well with the solubiliW 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