Abundance and properties of dissolved organic matter in pore waters of a freshwater wetland

Article Abstract:

Significant amounts of dissolved organic matter (DOM) can accumulate in sedimentary interstitial waters, according to studies of a freshwater wetland near Lake Erie. The concentrations of DOM increased with depth, as did number-average molecular weight, weight-average molecular weight, and molar absorptivities down to 5 cm, below which they were relatively constant. Presorbed organic matter may be released into pore waters as a consequence of reductive dissolution of mineral oxides in the sediment.

Ohio, Wetland ecology, Freshwater ecology, Organic water pollutants, Organic water pollution

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Dissolved inorganic carbon profiles and fluxes determined using pH and PCO2 microelectrodes

Article Abstract:

Data from potentiometric pH and PCO2 microelectrodes can be used to determine reliable concentrations of dissolved inorganic carbon (DIC) in pore waters and accurate DIC diffusive fluxes across the sediment-water interface. Very steep or spatially heterogeneous pH and PCO2 gradients can cause mismatching of measurements or disequilibrium of the CO2 system, however.

Usage, Measurement, Microelectrodes, Hydrogen-ion concentration, Carbon cycle (Biogeochemistry), Carbon cycle, pH measurement

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Interpretation of measured concentration profiles in sediment pore water

Article Abstract:

A robust numerical technique is presented for interpreting measured concentrations of solutes in sediment pore water. Molecular diffusion, bioturbation and irrigation can be included in the analysis. A test against analytical solutions and examples using measured data are discussed.

Statistical Data Included, Analysis, Biogeochemistry, Sediment, Suspended, Suspended sediment

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