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【单选题】
不同固化剂固定重金属的机理?A.
如施用石灰主要通过重金属自身的水解反应及其与碳酸钙的共沉淀反应机制降低土壤中重金属的移动性;
B.
如沸石是碱金属或碱土金属的水化铝硅酸盐晶体,含有大量的三维晶体结构、很强的离子交换能力及独特的分子结构(具有骨架状的特殊构造),从而通过离子交换吸附和专性吸附降低土壤中重金属的有效性,
C.
如向土壤添加富含Fe/Mn氧化物的物料, Fe/Mn氧化物能专性吸附重金属,使其生物有效性降低;
D.
在高pH 值条件下产生固定,形成难溶性的复合物,使金属离子难以向地下水淋溶;
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