Lead Extraction from Soil by Washing with Ethylenediamine Disuccinic Acid Tisodium Salt (Na3EDDS)

摘要

In this paper are presented the research performed in order to establish the optimum conditions of lead extraction from soil by washing with ethylenediamine disuccinic acid trisodium salt (Na3EDDS). Laboratory experiments were performed on soil samples taken from the Cop?a Mic? area, an area with highly polluted soil with Cu, Zn, Pb and Cd. Soil samples were subjected to washing with Na3EDDS for 2, 4, 6, respectively 8 hours, the Na3EDDS solution concentration was 0.4, 0.5 and 0.6 [%]. Sample mixing was made using a stirrer with platform and orbital oscillation-rotation movement, with the stirring speed of 200 oscillations/minute. Lead determination was made by Inductively Coupled Plasma - Atomic Emission Spectrometry (ICP-AES). The experiments allowed determination of optimum parameters for washing, respectively the washing time and concentration of the washing solution, the best yield being of 85.54%.