The point of zero charge and sorption of cadmium (II) and strontium (II) ions on synthetic hydroxyapatite

摘要: Abstract Surface properties of synthetic well-crystallized hydroxyapatite were investigated. Points zero charge (pH PZC ) for different solid to solution ratios determined by the batch equilibration technique, using KNO 3 as a background electrolyte. It has been found that decrease in ratio from 1:100 1:500 leads pH 6.1 4.1, respectively. Sorption Cd 2+ ions is not influenced initial value investigated range (5–7), while sorption Sr -ions, wider (4.5–11.5), depends only on higher than 10, i.e. final values 4.5. Negative surface established when more effective cation sorption.