土壤锌、铜、铁、锰形态区分方法的选择

FRACTIONATION OF SOIL ZINC,COPPER, IRON AND MANGANESE

用化学连续提取的方法将土壤中的锌、铜、铁、锰依结合状态区分为交换态、碳酸盐结合态(石灰性土壤)、氧化锰结合态、有机结合态、无定形氧化铁结合态、晶形氧化铁结合态和硅铝酸盐矿物态.初步认为选定的形态及提取方法适于土壤中锌、铜、铁、锰等元素的研究.

A sequential extraction procedure was developed for fractionation of soil Zn, Cu, Fe and Mn. Seven fractions separated are exchangeable( 1 mol/L MgCl2,pH 7.0), bound to carbonates (1 mol/L NaOAc-HOAc, pH 5.0) , bound to manganese oxides (0.1 mol/L NH,OH·HC1 pH 2.0) , bound to organic matter( concentrated H2O2-1 mol/L MgCl2), bound to amorphous iron oxides(0.175 mol/L (NH4)2C2,O4-0.14 mol/L H2C2O2 pH 3.25),bound to crystalline iron oxides(0.04 mol/L NH2OH·HCl-25% HO-Ac) and in primary and secondary minerals (HC1O4-HF) .The extraction order and conditions discussed. Most fractions were in good correlation with soil properties.