DBPapers
DOI: 10.5593/sgem2012/s20.v5091

REHABILITATION METHOD OF THE AREAS NATURALLY CONTAMINATED WITH HEAVY METALS FROM THE BALAN METALLIFEROUS DISTRICT (ROMANIA, HARGHITA, ORIENTAL CARPATHIANS) – IMOBILIZATION BY APATITE

R. SZEP, C. BORBOLY, V. ARAD, S. ARAD
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 5, 675 - 684 pp

ABSTRACT

The present researches in Romania regarding decontamination of the mining areas refer
almost exclusively to the spoil-banks, settling lagoons and other areas influenced by the
mining activity. In the present paper we wish to analyse the decontamination in the
naturally contaminated areas which are not influenced by the mining activities, these
areas are called by us naturally contaminated areas. In 2008 we have undertaken a
biogeochemical research on Vaccinium myrtillus in the naturally contaminated
metaliferous (pyrites-red copper) district of Bălan (Eastern Carpathians) respectively a
pedogeochemical research, thus we determined increasing values above the threshold
for the heavy elements such Cu, Ni, Pb, Zn, and a statistically significant corelation for
all the analysed elements. We determined the pedogeochemical respectively
biogeochemical secondary dispersion halos and we established the intensity and
intensity contrast of these and the correlation coeficients for soil-plants.
In order to reduce the values of intensities and of intensity contrasts, of the fund values
and biogeochemical threshold, we used the amelioration method through powdery
apatite immobilization. We have chosen apatite because is a relatively cheap material
which can be easily procured.

Keywords: Naturally contaminated areas, secondary pedogeochemical and the
biogeochemical halos of dispersion, soil-plants correlation, amended biogeochemical
intensity halos