DBPapers
DOI: 10.5593/sgem2010.17.20.S0.453

DETERMINATION OF INDEX OF BIOAVAILABILITY AND BIOACCUMULATION COEFFICIENT FOR AS AND ZN - ANTHROPOGENIC SEDIMENT FROM IMPOUNDMENTS

AUTHOR/S: L. JURKOVIC, P. MATEJKOVIC
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 2, 479-486 pp

ABSTRACT

The processes of weathering and dissolution of the impoundment sediments have a
significant impact on mobility and availability of trace elements such as arsenic and
zinc. They can become dangerous sources of contamination for the surrounding
ecosystem. The focus of this study is coal ash impoundment near the village Poša, the
drainage water contaminating surface waters and sediments of the Kyjov Brook and
Ondava River. Results of chemical analysis show significant contamination by arsenic
and zinc. Maximum concentration values of As and Zn were observed in stream
sediments bellow the impoundment and were extremely high and reached for arsenic
3208.35 mg.kg-1 and zinc 3389.67 mg.kg-1. The presence of Fe and Mn oxyhydroxides
and incidentally the amount of sulphides plays an important role in terms of mobility
and bioavailability of arsenic and zinc. To determine bioaccumulation plant capability
and estimate the bioavailable portion of As and Zn release from sediments, the
accumulation coefficients and indices were calculated. Experiments showed up to
1814.41 mg.kg-1 Zn able to leach into solution in a bioavailable form. Some plants such
as Ceratophyllum demersum (Rigid Hornwort), wherein up to 573.8 mg.kg-1 Zn was
determined, show significant signs of accumulation. High concentrations of arsenic
have been reported in plants Typha latifolia and Phragmites australis.

Keywords: impoundment sediment, fly ash, bioavailability, arsenic, zinc