The physico-chemical properties and leaching behaviors of phosphatic clay for immobilizing heavy metals.

In this study, phosphatic clay was used as a phosphate containing material. The fractionation of phosphorus was carried out using the CRM BCR-684 protocol, and the inorganic phosphorus, especially all the apatite phosphorus, was found as the major form. The elemental compositions of the phosphatic clay were identified using an X-ray fluorescence spectrometer, and was found to be mainly composed of CaO and P2O5.