Diel variation of trace metals in the upper Clark Fork River, Montana
Article Abstract:
Diel cycling of trace metals is controlled by photoreduction and pH-dependent adsorption-desorption processes. Trace metals are highly abundant in bed and flood plain sediments in upper Clark Fork River, MT. Hourly sampling of samples from the river identified several major and trace elements. Analytical methods reveal diel variation in dissolved manganese and zinc, and acid-soluble particulate aluminum, iron, manganese, copper and zinc. The elements are present in higher concentrations at night due to increased total suspended matter at night. This increase is accompanied by increased pH and dissolved oxygen.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Natural background determination and impact quantification in trace metal-contaminated river sediments
Article Abstract:
A method for modeling the downstream dispersion of metal anomalies based on dilution mixing of anomalous and tributary sediments can help quantify the extent of metal contamination in rivers and to set realistic remediation goals. Quantification is made possible by allowing calculation of the dispersion curves of metals in stream sediments both before and after mining. Quantification of any anthropogenic exaggeration of an anomaly is also allowed. The model is designed to provide accurate approximations of natural and exaggerated dispersion trains.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Metal behavior during surface-groundwater interaction, Silver Bow Creek, Montana
Article Abstract:
The geochemical characteristics of the hyporheic zone in the bed sediment of Silver Bow Creek in Montana were investigated using a unique, in situ technique. The results indicated that the thickness of the hyporheic zone was due to the 96:4 mixing ratio of surface water to contaminated ground water. It is suggested that the hyporheic zone acts as a sink for metals and that there is a significant degree of metal loading to the bed sediment.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1995
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