By Alan H. Welch, Kenneth G. Stollenwerk
This booklet consolidates a lot of what's identified concerning the geochemistry of arsenic and offers new details on relationships among excessive concentrations of arsenic in flooring water and geochemical environments. the subject material of this booklet levels in scope from molecular-scale geochemical methods that impact the mobility of arsenic in flooring water, to arsenic infected flooring water on the nationwide scale. Chapters have been contributed by way of a world team of study scientists from a wide variety of backgrounds.
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Additional info for Arsenic in Ground Water: Geochemistry and Occurrence
The presence of peaks in the Fourier transformed EXAFS spectrum beyond the first shell of oxygen/hydroxyl atoms indicates chemisorption. Such peaks are evident in the FTs of both As(V) sorbed to HFOs (Fig. 5) and As(III) sorbed to HFOs (Fig. 6). , 1998). 8 Å (Manceau, 1995) were also reported for As(V) sorption on HFOs. , 1998). , 1993). , 1993 ; Table 5). , 1993). , a bidentate geometry; Fig. 7). , a tridentate complex; Fig. 7). This geometry yields the identical interatomic distance as the bidentate complex, but there is only one Fe nearest neighbor, which does not agree with the 48 Chapter 2 EXAFS data.
15 K gave using the enthalpy increment for vitreous from Johnson et al. (1980) and the enthalpy increment for orpiment from Blachnik et al. (1980). Blachnik et al. (1980) measured the enthalpy of fusion of a synthetic orpiment. 15 K, was These results suggest thermodynamic equivalence of some synthetic orpiments with some natural orpiments within about or less. 15 K from Mironova et al. (1984) was and thus represents the entire difference between the Gibbs energies of reaction from Mironova et al.
As was discussed in the previous section, the 2. Spectroscopic Investigations of Arsenic in Solid Phases 43 availability of coprecipitated As is probably lower than adsorbed As because a higher fraction of the total As is not available for reaction with aqueous solution. 1 The molecular-scale structure and chemistry of crystalline and X-ray amorphous metal oxide precipitates HFOs, HMOs, and HAOs are composed of octahedrally coordinated metal atoms that share edges to form chains; these in turn are linked together to form 2-D and 3-D structures.