Differences in organic surface microlayers from an artificially acidified and control lake, elucidated by XAD-8/XAD-4 tandem separation and solid state 13C NMR spectroscopy

Article Abstract:

The diffusion of carbon functional groups in surface microlayer dissolved organic matter (DOM) from an acidified and control freshwater lake in Norway was analyzed using solid state carbon-13 nuclear magnetic resonance (NMR) spectroscopy. The XAD-8/XAD-4 tandem separation method was used to gather organic substances from surface microlayers through a hydrophilic Teflon-coated drum. Results showed the existence of 15% to 20% carbohydrates in humic and fulvic acid parts of the acidified layers, showing the efficiency of the XAD-resin method and NMR spectroscopy in indicating the presence of DOM from different surface microlayers.

Research and Development in the Physical, Engineering, and Life Sciences, Analytical Laboratory Instrument Manufacturing, Analytical instruments, Water Pollution Control R&D, NMR Spectrometers, Environmental aspects, Nuclear magnetic resonance spectroscopy, Nuclear magnetic resonance, Humic acid, Fulvic acids, Humic acids, Water pollution research, Spectrometers

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Variation in photoreactivity of iron hydroxides taken from an acidic mountain stream

Article Abstract:

The photoreduction of iron hydroxides is known to exert significant influence over several biogeochemical processes in streams impacted by acid mine drainage. Using in-stream and laboratory measurements, the reactivity declined for material taken from sites progressively downstream from the AMD inflow, while photoreduction increased for the fresher iron hydroxides, but remained unchanged for the older hydroxides. The loss of photoreactivity for the older material can be explained by a drop in the number of active surface sites, a change in the nature of the surface sites, or a combination of both.

Comment:

Photoreduction of iron hydroxides is known to exert influence over biogeochemical processes in streams with acid mine drainage

United States, Science & research, All Other Basic Inorganic Chemical Manufacturing, Iron Compounds NEC, Iron compounds, Article

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Chemistry of Cr(VI) in a constructed wetland

Article Abstract:

Laboratory scale wetlands were created to determine constructed wetland feasibility in removing chromium from an acidic solution and to define wetland chemical properties. Chromium was removed from an aqueous state by using soils with substantial amounts of organic matter. Removal of the organic matter hindered the removal of chromium from its earlier phase. Thus, constructed wetlands aid in the removal of chromium deposits from acidic waste streams.

Wetlands, Chromium, Chromium (Metal)

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