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MOBILITY OF METALS IN SEDIMENTS CONTAMINATED WITH HISTORICAL MINING WASTES: EXAMPLE FROM THE TRI-STATE MINING DISTRICT, USA
Gutierrez, M., Z.J. Collette, A.M. McClanahan, and K. Mickus.
Soil Systems 3(1):22(2019)

The Tri-State Mining District (TSMD) of Kansas, Missouri, and Oklahoma was a world-class Zn and Pb producer. Mining ceased in the 1950s, leaving behind a large amount of mine wastes. Although much of the affected area has been remediated, stream sediments may still contain toxic levels of metals. The mobility of the metals was determined for sediment samples from Turkey Creek, Missouri. The median values of the metal content were 2700 mg/kg Zn, 161 mg/kg Pb, and 10.8 mg/kg Cd. These concentrations marginally surpass the sediment quality guidelines that differentiate between toxic and nontoxic conditions. Mobility was determined by sequential extraction of two phases: bioavailable and Fe-oxides. The fraction of the metal available to biota roughly agrees with the values reported for other areas of the TSMD. The methodology emphasizes ecosystem health and can be applied to other areas where Zn-Pb concentrations in soils and sediments are a concern. This article is Open Access at https://www.mdpi.com/2571-8789/3/1/22/htm.



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