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Extraction and Characterization of Humic Acids and Humin Fractions from a Black Soil of China[J]. XING Bao-Shan, LIU Ju-Dong, LIU Xiao-Bing and HAN Xiao-ZengNortheast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin 150040 (China). Department of Plant, Soil and Insect Sciences, University of Massachusetts, MA 01003 (USA).Pedosphere. 2005(01)