Removal of lead from vermiculite by using L-asparaginic-N,N-diacetic acid,a novel biodegradable chelating reagent, and depolymerized pectic acid

The removal of lead from vermiculite by means of elution with two kinds of novel chemical reagents L-asparaginic-N,N-diacetic acid and depolymerized p ectic acid, was investigated. The effects of contact time, concentration of the reagents and equilibrium pH of solution on elution of lead were examin ed by batch-wise technique. It was found that both of the reagents are effe ctive for the removal of lead and have the potential application for the re mediation of soil polluted by heavy metals.