Journal Article•
Mansfieldite, a new arsenate, the aluminum analogue of scorodite, and the mansfieldite-scorodite series
About: This article is published in American Mineralogist.The article was published on 1948-04-01 and is currently open access. It has received 18 citations till now. The article focuses on the topics: Scorodite & Arsenate.
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TL;DR: Soil concentrations of As, Cr, and Pb measured at certain locations in the park greatly exceeded the background levels of these heavy metals in the State of Delaware, suggesting that As is immobilized in the soil.
59 citations
Cites background from "Mansfieldite, a new arsenate, the a..."
...The presence of this mineral, which is rarely found in nature (Allen et al., 1948), has never been reported in the soil of Delaware....
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TL;DR: In this paper, a vertex-sharing three-dimensional network of cis-AlO4(H2O)2 octahedra and AsO4 tetrahedra is presented.
Abstract: Hydrothermally prepared mansfieldite, AlAsO4·2H2O (aluminium arsenate dihydrate), contains a vertex-sharing three-dimensional network of cis-AlO4(H2O)2 octahedra and AsO4 tetrahedra [dav(Al—O) = 1.907 (2) A, dav(As—O) = 1.685 (2) A and θav(Al—O—As) = 134.5 (1)°].
30 citations
TL;DR: The optimized in vitro model adequately predicted RBA values for a suite of solid As phases typically encountered in soils, with the exception of aluminum-based solids.
Abstract: There is a strong interest in developing an in vitro arsenic (As) model that satisfactorily estimates the variability in in vivo relative oral bioavailability (RBA) measurements. Several in vitro tests have been developed, but none is universally accepted due to their limited success in predicting soil As RBA. A suite of amorphous and crystalline solid As phases were chosen, utilizing a worst-case scenario (WCS) that simulated fasting children's gastric solution chemistry. The objectives of this study were to (i) determine the effects of residence time, pH, and solid-to-solution ratio on As bioaccessibility and speciation in the in vitro gastric test; (ii) provide the fundamental basis for an optimized in vitro model constrained by the WCS; and (iii) validate the optimized in vitro test with the in vivo RBA obtained with BALB/c mice. The gastric pH was the only significant (p < 0.05) factor influencing solid As bioaccessibility. Bioaccessible As retained the oxidation state after its release from the solid into the gastric solution. The optimized in vitro model adequately predicted RBA values for a suite of solid As phases typically encountered in soils, with the exception of aluminum-based solids. This study is an excellent starting point for developing an in vitro test applicable to different As-contaminated soils.
26 citations
TL;DR: In this paper, the synthesis and stability evaluation of mansfieldite (AlAsO4·2H2O) is described, which involves hydrothermal precipitation at 160 °C from equimolar (CAl = CAs = 0.3 M) Al (III) -As (V) nitrate solutions over a period of 24 hours.
22 citations
TL;DR: Comparison with other arsenate and phosphate minerals showed that both XPS and Raman spectroscopy are fast and non-destructive techniques to identify these minerals based on their differences in chemistry and the arsenate/phosphate vibrational modes due to changes in the symmetry and the unique fingerprint region of the lattice modes.
22 citations