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Concentration and fractionation of Cu, Cr, Ni and Zn in montmorillonitic and allophanic soils: Comparison of two different extraction methods
(IST CHIMICA AGRARIA, UNIV PISA VIA S MICHELE DEGLI SCALZI, 1999-05)
Sequential extraction of heavy metals in soils irrigated with wastewater
(MARCEL DEKKER INC, 1999-05)