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Publications—Scientific Investigation Report |
Reactive-transport processes in the Red River, downstream from the town of
Mass-loading calculations allowed identification of several specific locations
where elevated concentrations of potential contaminants entered the
Speciation and saturation index calculations indicated that although solubility
limits the concentration of aluminum above pH 5.0, at pH values above 7 and
aluminum concentrations below 0.3 mg/L inorganic speciation and mineral
solubility controls no longer dominate and aluminum-organic complexing may
occur.
The August 2001 reactive-transport simulations included dissolved iron(II)
oxidation, constrained using measured concentrations of dissolved iron(II) and
dissolved iron(total). Both simulations included precipitation of amorphous
Al(OH)3 and hydrous ferric oxide as Fe(OH)3, and sorption
of copper and zinc to the precipitated hydrous ferric oxide. Simulations
revealed that hydrogen, iron, aluminum, copper, and zinc were non-conservative
and that mineral precipitation can account for iron and aluminum concentrations.
Copper and zinc concentrations can be accounted for by simulating their sorption
to hydrous ferric oxide forming in the water column of the
Contents
Figures
Tables
Conversion Factors
Abbreviations used in this Report
Abstract
Introduction
Purpose and Scope
Physical Setting
Climate and Vegetation
Hydrogeology
Surface Water
Mining History
Acknowledgments
Methods
Sampling Locations
Measurement of Onsite Parameters
Water-Quality Parameters
Analytical Methods and Quality Control
Mass Loading for the August 2001 Tracer Study
Sulfate
Fluoride
Aluminum
Manganese
Iron
Copper
Zinc
Identifying Sources of Mass-Loading
Identifying Sources Using Element Ratios
Identifying Sources Using Mixing Curves
Summary of Ground-water and Surface-water Sources of Mass Loading
Aluminum Speciation Modeling
Speciation and Saturation Indices
Trends in Aluminum Speciation and Saturation Indices
Reactive-Transport Modeling
Conceptual Model and Governing Transport Equations
Reaches
Simulated Solutes and Sorbents
Lateral Inflow Concentrations
Upstream Boundary Conditions
Streamflow Parameters
Geochemical Parameters
Thermodynamic Data
Reduction-Oxidation Parameters for Iron
Simulation Results
Hydrogen
Aluminum
Iron
Copper
Zinc
Summary
Literature Cited
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For more information on the investigation of baseline and pre-mining ground water quality, Red River Valley Basin, NM visit our website at:
http://wwwbrr.cr.usgs.gov/projects/GWC_chemtherm/questa.htm
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