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SF6-3He tracer release experiment: a new method of determining longitudinal dispersion coefficients in large rivers

Article Abstract:

The nonreactive synthetic gas sulfur hexafluoride (SF6) was injected into the Hudson River south of Albany, NY, to estimate dispersion coefficients. SF6 distributions along the main axis of the river were approximately Gaussian three days following injection. Two periods of linear growth were noted due to the change in variance with time. For the first period (days 3-8), longitudinal dispersion coefficient was placed at 47 plus or minus 6 m2 s(-1) and at 162 plus or minus 22 m2 s(-1) during the second period (days 8-13). The lower cost of SF6, which means more of it can be injected, allows work in larger systems and for longer periods.

Usage, Environmental aspects, Rivers, Dispersion, Dispersion (Optics), Tracers (Chemistry), Sulfur hexafluoride

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Models of metal binding structures in fulvic acid from the Suwannee River, Georgia

Article Abstract:

Fulvic acid was assessed for its ability to bind Ca2+, Cd2+, Cu2+, Ni2+ and Zn2+ at pH 6 before and after extensive fractionation and results show that carboxyl groups were clustered in short chain aliphatic dibasic acid structures. Results show that the binding constant for Ca2+ had the greatest increase in the metal binding fraction and suggests that ether-substituted oxysuccinic acid structures are good models for the metal binding sites at pH 6.

Water-Based Source Water Pollution, Biodegradation, Water pollution, Fulvic acids

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Variability in atmospheric chlorofluorocarbons (CCl3F and CCl2F2) near a large urban area: implications for groundwater dating

Article Abstract:

Atmospheric CFC mixing mechanisms are found to vary and should be defined explicitly when using CFCs as a groundwater dating tool in urban areas. Diurnal, weekly, seasonal patterns and differences resulting from prevalent regional meteorological conditions are found to greatly affect CFC atmospheric mixing ratios and should thus be explicitly defined so that a more accurate urban groundwater date is established.

Misc Gaseous Pollutants, Water, Underground, Groundwater, Gaseous pollutants, Chlorofluorocarbons

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