不同钝化剂对土壤中Zn,Cd,Pb,As的钝化效果研究

将过磷酸钙磷肥、石灰以及斑脱土3种钝化剂按不同配比混合制成不同的钝化剂组合,进行土壤原位钝化培养实验,并运用CaCl2-DTPA及0.1 mol/L的HCl溶液进行浸提,探究了不同钝化剂在0,30,60,90 d对污染土壤中Zn,Cd,Pb,As的钝化效果与特征。从对单一重金属在不同龄期时钝化效果以及同一龄期下复合重金属钝化效果及机理两方面,筛选出优势钝化剂。

Three passivating agents of superphosphate phosphate fertilizer,lime and bentonite were mixed in different proportions to make different passivation agent combinations,and the soil in-situ passivation culture experiment was carried out,and CaCl2-DTPA and 0.1mol/L HCl solution were used for leaching.The passivation effects and characteristics of different passivators on Zn,Cd,Pb and As in contaminated soil were explored at 0 d,30 d,60 d,and 90 d.Furthermore,from the passivation effect of single heavy metals at different ages and the passivation effect of composite heavy metals at the same age,superior passivating agents were screened out.