Cadmium and manganese sorption by soil macropore linings and fillings

摘要: The authors collected materials partially filling or coating the walls of soil macropores to compare their sorptivity for cadmium (Cd) and manganese (Mn) with that in homogenized samples from same profile. Organic-rich linings fillings root-derived exhibited higher sorptivities Cd Mn soil, particularly at lower solution pH values (pH 4 5). Due density pH-dependent sorption sites on organic matter, macropore increased more rapidly as than did inorganic materials. Inorganic fracture-derived were very similar sorptivities. For both materials, was generally far important determining nature material. Overall, results study suggest migration will likely be highly retarded other types macropores. absence significant differences between suggests factors whether retardation is greatermore » less whole matrix non-root-derived macropores.« less