Evaluation of a sequential extraction procedure for the fractionation of amorphous iron and manganese oxides and organic matter in soils
Tu Qiang, Shan Xiao-quan, and Ni Zhe-ming
Science of The Total Environment
Volume 151, Issue 2, 11 July 1994, Pages 159-165
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http://dx.doi.org/10.1016/0048-9697(94)90172-4