Author :
Kalbasi, M.,Peryea, F.,Lindsay, W. L
Title of Article :
Examination of PbCO***3 solubility using direct and competitive chelation methods
Title Of Periodical :
IRAN AGRICULTURAL RESEARCH
Descriptors :
PbCo***3 solubility,Competitive chelation method
Abstract :
Competitive chelation method may be used to determine or examine the solubility product of a mineral. This method has the advantage of being independent of chemical conditions of the system. Direct and competitive chelation methods as well as XRD analysis were employed to examine the solubility product and mineralogical identity and purity of two PbCO***3 samples. One of these samples has been used as the pure cerussite mineral for controlling activity of Pb**2+ in several studies. Both direct and competitive chelation method indicated that log K***sp value of -13.5 previously chosen for cerussite is smaller than its actual value. A mean value of -13.33 from direct method and an average value of -12.75 from chelation studies were obtained for log K***sp of two PbCO***3 samples. The XRD results indicated that one of the samples contains hydrocerussite as an impurity.
