In all of these phases Se existed in negative oxidation states, indicating that the oxidized Se present in weathered shales is a result of oxidative weathering of the reduced mineral Se to elemental Se, selenite, or selenate.
Thus, the putative microorganisms existed in the system contemporaneously with the hydrothermal activity, after the oxidation and weathering of the chromite but prior to the precipitation of rhodochrosite.
Allowing deltas to form in FCPW disposal ponds without ponded water that would allow oxidation and weathering of the FCPW materials.
The overall leaching column results from our large regional sample set (Daniels et al. 2013) reconfirmed earlier findings by Orndorff et al. (2010) and Agouridis et al. (2012) that the extent of oxidation and weathering of the mine spoil before mining has a dominant influence on overall TDS release.
However, owing to the thermoplastic properties of polypropylene, they can be processed and reprocessed, and they are resistant to oxidation, ozone attack, and weathering.
The relaxation magnitudes are governed by the in-situ oxidative-weathering conditions on sulphide mineral surfaces contained in the tailings, and decrease with the oxidation degree.
This means that the early corrosion of weathering steels by oxidation is gradually inhibited by the build-up of corrosion products.
Organic content in EGR substrates is specified to be low because organics retain moisture better than mineral substances (influencing roof loads), while oxidation, compression and other forms of weathering limit their longevity (Kolb et al., 1983).
All of these components are released by various chemical weathering reactions, particularly when deeper unweathered and unoxidized strata are unearthed and exposed to rapid oxidation, hydrolysis, hydration and dissolution reactions in the surfaces and fills of active coal mines.
