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14 items found (0 items not approved), displaying 11 to 14.[First/Prev] 1, 2 [Next/Last]

Instruments / Technical Area	Publication Details	Published
	Partitioning of Pb(II) during goethite and hematite crystallization: Implications for Pb transport in natural systems Hong Phuc Vu , Samuel Shaw , Loredana Brinza , Liane G. Benning Applied Geochemistry 39, 119 - 128 DOI: 10.1016/j.apgeochem.2013.10.001 Show Abstract ▼ Abstract: The interaction (e.g., adsorption and incorporation) of Pb with iron(III) (oxyhydr)oxide minerals has a significant influence on its partitioning and transport in many natural systems (e.g., rivers). The incorporation of Pb during ferrihydrite crystallization to hematite and goethite at neutral and alkaline pH, in the presence and absence of sulphate SO42- has been studied using X-ray Absorption Spectroscopy (XAS), X-ray Powder Diffraction (XRD), electron microscopic techniques and chemical extraction procedures. The XRD data showed that hematite and goethite were the end-products of crystallization at pH 5, whereas goethite was the sole product at pH 13. The Pb partitioning data revealed that upon crystallization at pH 5, ∼60% of the initially adsorbed Pb remained on the surface of the crystalline hematite/goethite, while ∼20% became incorporated with the remaining ∼20% released back into solution. Lead incorporation occurred primarily during the initial stage of ferrihydrite crystallization prior to hematite/goethite formation at pH 5. The presence of SO42- at pH 5 had little influence on the partitioning of Pb or mineral phases formed. At pH 13, 52% of the adsorbed Pb was incorporated during crystallization to goethite. Lead incorporation into this phase occurred over the entire crystallization process with adsorbed Pb incorporated during goethite crystal growth. X-ray Absorption Spectroscopy and unit cell size data demonstrated that Pb did not replace Fe within the structure of hematite or goethite, but was incorporated into defects or nanopores within the iron (oxyhydr)oxides.	Dec 2013
I18-Microfocus Spectroscopy	Incorporation of strontium in earthworm-secreted calcium carbonate granules produced in strontium-amended and strontium-bearing soil Loredana Brinza , Paul Quinn , Paul Schofield , Fred Mosselmans , Mark Hodson Geochimica Et Cosmochimica Acta DOI: 10.1016/j.gca.2013.03.011 Diamond Proposal Number(s): [2000] Show Abstract ▼ Abstract: This paper investigates the incorporation of Sr into biomineralized calcium carbonate granules secreted by the earthworm Lumbricus terrestris. Experiments were conducted using an agricultural soil amended with Sr(NO3)2 to give concentrations in the range 50–500 mg kg−1 Sr and a naturally Sr-rich, Celestine-bearing soil containing up to 11 000 mg kg−1 Sr. Granule production rates were in the range 0.26–2.3 mgCaCO3 earthworm−1 day−1; they showed no relationship with soil or soil solution Sr concentration but decreased with decreasing pH. Strong relationships exist (r2 ⩾ 0.8, p ⩽ 0.01) between the Sr concentrations and Sr/Ca ratios of the granules and those of the soil, soil solution and earthworms. The highest bulk Sr concentration we recorded in the calcium carbonate granules was 5.1 wt.% Sr whilst electron microprobe analysis recorded spot concentrations of up to 4.3 wt.% Sr. X-ray diffraction and X-ray absorption spectroscopy indicate that the majority of the calcium carbonate is present as Sr-bearing calcite with trace amounts of Sr-bearing vaterite also being present. The granules produced in the Sr-amended soils concentrated Sr relative to Ca from the bulk soil and the earthworms. This suggests that earthworm secreted calcium carbonate may be significant in the cycling of 90Sr released into soils via nuclear accidents or leakage from nuclear waste storage facilities.	Apr 2013
I18-Microfocus Spectroscopy	Sr, Cu and Zn incorporation in earthworm synthesized calcium carbonate granules - a µXAS and µS-XRF investigation Loredana Brinza , Fred Mosselmans , Paul F. Schofield , Erica Donner , Enzo Lombi , David Paterson , Paul D Quinn , Tina Geraki , Mark E Hodson EMC2012 Diamond Proposal Number(s): [5731, 2123, 2000, 7090]	Sep 2012
I18-Microfocus Spectroscopy	Strontium incorporation into carbonate granules secreted by earthworms Loredana Brinza , Fred Mosselmans , Paul Schofield , Paul Quinn , Mark Hodson Goldschmidt Conference 2011	Jun 2011

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