Abstract
To remedy polluted soil, EDTA is choosen when seeing metal Pb (Ⅱ) as target pollutant. There has been a focus on discussion about the infuencs of liquid-solid ratio, EDTA concentration and extraction time on Pb (Ⅱ) extraction rate. And attention is being paid to study the effect of Na2S concentration and pH on Pb (Ⅱ) removal rate with Na2S as EDTA regeneration medium. The results obtained demonstrate that when the liquid-solid ratio is 10, EDTA concentration is 0.5 mol/L, extraction time is 24 h, extraction efficiency can reach 66.67 %. When the concentration of Na2S is 0.5 mol/L, pH is 10, the 96.67 % Pb (Ⅱ) removal rate can be achieved.
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