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Plant‐Available Zinc and Lead in Mine Spoils and Soils at the Mines of Spain, Iowa
Author(s) -
Mbila Monday O.,
Thompson Michael L.
Publication year - 2004
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2004.5530
Subject(s) - soil water , environmental remediation , environmental chemistry , contamination , zinc , extraction (chemistry) , tailings , soil contamination , environmental science , soil test , chemistry , mining engineering , cadmium , geology , soil science , ecology , organic chemistry , chromatography , biology
To investigate the forms of Zn and Pb and their plant availability in mine spoil long after its abandonment, we studied seven sites in the Mines of Spain, near Dubuque, IA. Ores of Zn and Pb were mined from dolomitic limestone primarily during the 19th century, and there had been no subsequent remediation of metals‐contaminated spoil. From both mine spoil and undisturbed areas, we collected root‐zone soil samples as well as samples of the dominant ground‐level, native plants, aniseroot [ Osmorhiza longistylis (Torr.) DC.] and black snakeroot ( Sanicular marilandica L.). We determined Zn and Pb concentrations in both the plant tissue and in the soil samples after strong‐acid digestion, and we fractionated the solid‐phase forms of Zn, Pb, and P in the soil samples by using sequential extraction. Concentrations of total Zn and Pb were 10‐ to 20‐fold greater in the spoil than in the undisturbed soils. Plants growing in the mine spoil had Zn concentrations two to four times greater and Pb concentrations more than 26 times greater than did plants growing in the undisturbed soils. The highest concentrations of Zn and Pb were in the CBD‐extractable and the residual fractions in both undisturbed and mine spoil samples. Although the mine spoil contained large amounts of P, Zn, and Pb were available for uptake by the two plant species in amounts proportional to Zn and Pb concentrations in the rooting zone.