Assessment of isotopically exchangeable Al in soil materials using 26Al tracer

Kleja, Dan Berggren; Standring, William J.F.; Oughton, Deborah; Gustafsson, Jon Petter; Fifield, L.K.; Fraser, A. R.

doi:10.1016/j.gca.2005.06.010

Cited by 10 publications

(1 citation statement)

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“…These observations suggest that imogolitetype materials, mostly allophane, are the predominant secondary Al phases in these soils (Gustafsson et al 1995;Gustafsson et al 1999). Imogolite-type materials were also identified in the Risbergshöjden Bs horizon by Kleja et al (2005). …”

Section: Soilsmentioning

confidence: 70%

Molybdenum binding to soil constituents in acid soils: An XAS and modelling study

Gustafsson

Tiberg

2015

Chemical Geology

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Highlights:-Molybdenum(VI) is bound to ferrihydrite and aluminium hydroxide predominantly as tetrahedral, edge-sharing inner-sphere and outer-sphere complexes.-On natural organic matter, molybdenum(VI) is bound at low pH as an octahedrally coordinated monomeric complex.-Results for a spodic B horizon show an Al(OH) 3 -type phase to be an important sorbent for molybdenum(VI).-The results were used to suggest new complexation constants for the CD-MUSIC and Stockholm Humic models. 2 AbstractDespite its importance as a trace element, the binding mechanisms of molybdenum in soils are not well known. In this study, we studied the binding of molybdenum onto selected soil samples, and we used X-ray absorption spectroscopy (XAS) to characterise the coordination of molybdenum on three important environmental sorbents: ferrihydrite (Fh), amorphous aluminium hydroxide (Al(OH) 3 ) and fulvic acid. The X-ray near-edge structure (XANES) data showed that the added molybdenum(VI) was not reduced, although for the organic samples the coordination shifted from tetrahedral to octahedral. The EXAFS (extended X-ray absorption fine structure) analysis showed that molybdenum(VI) on Fh and Al(OH

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Section: Soilsmentioning

confidence: 70%