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- Title
Elemental Composition and Reactivity of Metals in Wood Ash.
- Authors
RAHMAN, ASIFUR; BLAKE, JOHANNA; ALI, ABDUL-MEHDI; RIDGEWAY, CYRENA; CERRATO, JOSÉ; EL HAYEK, ELIANE; BIXBY, REBECCA; SPILDE, MICHAEL; ARTYUSHKOVA, KATERYNA
- Abstract
We investigated the elemental composition along with dissolution and adsorption of metals in wood ash under laboratorycontrolled conditions using aqueous chemistry, microscopy and spectroscopy to better understand metal availability after wildfire events. Ash samples were prepared from three different tree species (Quaking Aspen, Ponderosa Pine and Blue Spruce) collected from Valles Caldera, New Mexico. Acid extractable elemental cation analysis suggested that wood ash burnt at both 3500C and 5500C have significantly higher (p < 0.05) metal concentrations from oven dried wood at 600C. Pine ash samples at 3500C and 5500C were associated with high concentrations of metals such as Mg, K, Ni, Cu, Si, Cr and Fe. 3500C Pine ash released the highest Dissolved Organic Carbon content (11.32+0.28 mg carbon/L) in the batch experiments. Further experiments and characterization were conducted on the Pine ash samples. We observed dissolution of Cr, Ni, Fe, Cu and Zn in solution reacting Pine ash with deionized water. In the batch adsorption experiments with Cu(II) and Cr(VI), rapid decrease in Cu(II) concentration in solution was observed, suggesting possible adsorption and/or precipitation of Cu(II) onto 3500C pine ash. Limited decrease of Cr(VI) in solution was observed suggesting repulsion of negatively charged 3500C pine ash surface and the anionic species of Cr (e.g., HCrO4- and CrO42-). XPS survey scan detected presence of Cu on the reacted ash, indicating that Cu is associated with the ash "near surface" region. These results help to better understand how dissolution and adsorption processes can affect the fate of metals in water post fire.
- Subjects
WOOD ash; DISSOLUTION (Chemistry); METAL absorption &; adsorption; MULTIPURPOSE trees; X-ray photoelectron spectra
- Publication
New Mexico Journal of Science, 2017, Vol 51, Issue 1, p71
- ISSN
0270-3017
- Publication type
Article