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- W2323567910 abstract "Previous research has indicated that Al and heavy metals are distributed unevenly within soil aggregates. This paper will examine statistically the differences in metal concentrations in aggregate interior and exterior by including more samples. Concentrations and fractions of Al, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Zn, and the major metal sorbents (cation exchange sites, organic matter, oxides) in mechanically separated soil aggregate interior and exterior were measured. Aggregates were collected from 26 A and B horizons of 13 soils under forest or grassland. Metals were speciated using a 7-step sequential extraction procedure. The concentrations of all metal sorbents in the exterior were lower than in the interior. The concentrations of easily extractable fractions of all metals were higher in the exterior than in the interior, whereas the reverse was true for concentrations of metals extractable with strong acids only (residual). All differences were small but systematic and generally significant. We propose the following hypotheses to explain the results: (i) Preferential weathering of aggregate surfaces causes a shift from residual to other metal forms and (ii) preferential sorption of deposited metals by the aggregate surfaces leads to a total enrichment of metals in the aggregate exterior, especially in easily extractable forms." @default.
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- W2323567910 date "1997-05-01" @default.
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- W2323567910 title "DIFFERENCES IN CONCENTRATIONS AND FRACTIONS OF ALUMINUM AND HEAVY METALS BETWEEN AGGREGATE INTERIOR AND EXTERIOR" @default.
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- W2323567910 doi "https://doi.org/10.1097/00010694-199705000-00002" @default.
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