Carbon limitation of denitrification rates in an anaerobic groundwater system

Article Abstract:

An evaluation of the potential denitrification rates in a shallow anaerobic groundwater system is discussed. Sediment and water samples were collected from a golf course in Tampa, Florida and were subjected to particle size analysis and calibrated acidity/dissolved oxygen meters, respectively. The rate of denitrification and the influence of acidity on the denitrifying activity was analyzed using acetylene block technique. It was found that the primary cause for the accumulation of nitrate in groundwater underlying cultivated lands is the carbon limitation in anaerobic aquifer sediments.

Analysis, Nitrates, Denitrification

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On-line monitoring of aquatic samples

Article Abstract:

The need for selectivity, speed and sensitivity in trace-level environmental analysis is pushing the development of on-line automated monitoring and screening systems. These systems are based on the combination of analyte trace-enrichment and chromatographic separation-with-detection. The Free University of Amsterdam in the Netherlands has developed aquatic analyzers based on on-line solid-phase extraction gas chromatography and solid-phase extraction-liquid chromatography. The advantages and limitations of these systems are discussed.

Analytical Laboratory Instrument Manufacturing, Analytical instruments, Chromatographic Analyzers, Automated Chemical Analyzers, Technology application, Chromatographs, Separation (Technology), Trace analysis, Chromatography, Electrochemical instruments, Chromatographic analysis

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Groundwater record of halocarbon transport by the Danube River

Article Abstract:

A coherent record of halocarbon contamination in the Danube River in Hungary was determined through an analysis of a shallow aquifer, which had a low coefficient of dispersion. The groundwater analysis determined that the halocarbon concentration reached its highest level in the 1960s and 1970s. Upstream urban-industrial centers may have been the main point source for the halocarbons during this peak period.

Water pollution

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