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《Acta Scientiae Circumstantiae》 1990-03
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Jiang Tinghui, Hu Aitang, Qin Huaiying (Department of Soil Science and Agricultural Chemistry, Nanjing Agricultural University)  
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.
【Fund】: 国家自然科学基金资助项目
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