土壤中铁和铝是以多种形态存在,为了把铁、铝等氧化物同层状硅酸盐相分离,并把氧化物中的铁、铝、锰、硅等以及晶质的和无定形的区分开来,化学区分法或选择溶解法是不可缺少的。例如常用连二亚硫酸钠(DCB法)和草酸铵(Tamm氏溶液)等提取液,除分别测定 In the soil, iron and aluminum exist in various forms. In order to separate oxides such as iron and aluminum from the layered silicate, iron, aluminum, manganese, silicon and the like in the oxide as well as crystalline and amorphous Separately, chemical or selective dissolution methods are indispensable. For example, commonly used sodium dithionite (DCB method) and ammonium oxalate (Tamm’s solution) and other extracts, in addition to the determination