Kinetics of lead release from soils at historic mining and smelting sites, determined by a modified electro-ultrafiltration

Anto Jelecevic, Dietmar Horn, Herbert Eigner, Manfred Sager, Peter Liebhard, Karl Moder and Daniel Vollprecht
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Anto Jelecevic: Universityof Natural Resources and Life Sciences Vienna, Vienna, Austria
Dietmar Horn: BGD Bodengesundheitsdienst GmbH, Ochsenfurt, Germany
Herbert Eigner: AGRANA Research & Innovation Center GmbH, Tulln, Austria
Manfred Sager: Bio Forschung Austria, Vienna, Austria
Peter Liebhard: Universityof Natural Resources and Life Sciences Vienna, Vienna, Austria
Karl Moder: Universityof Natural Resources and Life Sciences Vienna, Vienna, Austria
Daniel Vollprecht: Montanuniversitaet Leoben, Leoben, Austria

Plant, Soil and Environment, 2019, vol. 65, issue 6, 298-306

Abstract: Within a pilot study, after pedological and mineralogical characterization, various kinetic models were tested to fit lead (Pb)-mobilization kinetics from soils at historic mining and smelting sites. Pb mobilization was obtained by modified electro-ultrafiltration (EUF) after addition of diethylenetriaminepentaacetic acid (DTPA) at variable conditions of extraction. 10 fractions were sequentially produced, under mild conditions at 20°C/200 V (to simulate an initial release) for fractions 1-5, and subsequently harder conditions at 80°C/400 V (to simulate a long-term release) for fractions 6-10. The special samples treated within this work yielded higher extraction rates within the first runs. Closest fits in terms of the coefficient of determination (R2) were obtained from the 2nd order polynomial model y = a + bt + ct2, and in terms of re-calculated results by the parabolic equation y = a + b √t. The fitted constants obtained by the modified EUF method correlated better with soil pH than with organic carbon and clay contents. From this, it remains open, whether the dissolution of the Pb-minerals in the electric field or concentration resp. diffusion of the DTPA is rate-determining.

Keywords: heavy metal; toxic element; metal mobility; contamination; soil testing (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:65:y:2019:i:6:id:611-2018-pse

DOI: 10.17221/611/2018-PSE

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