Effect Assessment of Nano-particle Hydroxyapatite for Remediation of Cd and Pb Contaminated Soil
Forms of lead and cadmium were analyzed with five-step Tessier extraction method by adding different proportions of nano-hydroxyapatite(n-HAP) and taking artificial soil pollution means.Assessment of remediation of soil heavy metals with n-HAP was studied by bioavailability.Results showed that n-HAP had a certain degree of adsorption and inactivation effect on cadmium.When 5g of n-HAP was added into 100g soil sample,the effect of remediation was best,with removal rate of n-HAP to the available state of heavy metal up to 49%.The inactivation of n-HAP on active forms of lead was relatively effective,the decreased rate reached the level of 90% and the longer balance the better result.n-HAP had a better remediation effect on lead contaminated soil than the cadmium contaminated soil.