Gregory G. Kipp, James J. Stone
Sediment samples were analyzed as part of ongoing environmental investigations of historical U mining impacts within Custer National Forest in Harding County, South Dakota. The objective was to determine correlations between As and U content, grain size, and soil mineralogy to identify contaminant fate and transport mechanisms. Soil samples were collected near the mining source zone and up to 61 km downgradient of the minesites. Samples were homogenized and wet sieved, with metal(loid) concentrations measured using inductively coupled plasma mass spectrometry (ICP-MS). Powder X-ray diffraction (XRD) revealed quartz as the primary mineral, while scanning electron microscopy (SEM) identified the presence of Fe sulfides and Fe (hydr)oxides, indicating redox potential heterogeneity at the microscale. Elevated metal(loid) concentrations were linked to trace levels of Fe sulfide, influencing metal transport during weathering. Sequential chemical extractions (SCE) showed that most As and U adsorbed to Fe- and Mn-oxides and carbonates, with lesser amounts bound by ion exchange and organics. Noteworthy changes in U/Th and As/Th ratios were observed, suggesting metalloid-Th ratios may serve as indicators in environmental investigations of geochemically significant watershed conditions.
@article{705d03f3-7ef7-4ee9-94db-e0439e557d2d,
title={Arsenic and uranium transport in sediments near abandoned uranium mines in Harding County, South Dakota},
author={Gregory G. Kipp and James J. Stone},
year={2009},
language={en}
}TY - JOUR TI - Arsenic and uranium transport in sediments near abandoned uranium mines in Harding County, South Dakota AU - Gregory G. Kipp AU - James J. Stone PY - 2009 LA - en ER -
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