Chromium redox chemistry in a lower Mississippi Valley bottomland hardwood wetland

Article Abstract:

Wetlands sometimes serve as nutrient sinks to improve the quality of wastewaters, yet scientists' current understanding of the biogeochemical processes involved is inadequate. Several experiments studied the effects of environmental changes in a seasonally flooded hardwood wetland in the Lower Mississippi Valley on the speciation and solubility of chromium. The wetland studied was shown to act as a chromium sink, but the model is not applicable to other sites. The precipitation, sorption, complexation, redox reactions and diffusion will vary for each wetland and need to be examined separately.

Environmental aspects, Mississippi Valley, Wetland ecology, Floodplain ecology

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Monitoring crude oil mineralization in salt marshes: use of stable carbon isotope ratios

Article Abstract:

A sensitive, inexpensive and simple method for monitoring and quantifying crude oil mineralization using (delta)13C values is presented. The method involves measuring changes in CO2 (delta)13C signatures and the rate of CO2 production. The rate of mineralization from both the crude oil and indigenous carbon pool can be determined by combining these (delta)13C values with simple isotope mass balance equations. Simultaneous decreases in alkane-, isoprenoid-, and PAH-hopane ratios confirmed hydrocarbon degradation.

Petroleum, Biodegradation, Biomineralization

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Assimilation of hydrophobic chlorinated organics in freshwater wetlands: sorption and sediment-water exchange

Article Abstract:

The sorption and sediment-water exchange mechanisms during the incorporation of hydrophobic chlorinated organic substances in freashwater wetlands was investigated. The results showed that unusual hydrologic conditions unique to wetlands which promote water-sediment exchange and accretion controlled the sorptive assimilation of organic compounds.

Gases, Wetlands, Gas absorption, Gas adsorption

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