2. ENVIRONMENTAL ChEMISTRy & TEChNOLOGy 2.1. Lectures

Chem. Listy, 102, s265–s1311 (2008) Environmental Chemistry & Technology
notably high accumulation of trace elements including
As in the most contaminated sample KY-100 (3,208 mg As kg –1 )
with the lowest relative mobility, is likely due to high contents
of the Fe, Al, Mn oxohydroxides. The relative mobility
of As was inversely related to the oxalate-extractable
Mn content (r = –0.960, P < 0.05) and not significantly to the
oxalate-extractable Fe content such that diffusion in hydrated
micropores of amorphous Fe and Mn oxides might be the rate
limiting mechanism of the As release (Fig. 2.).
Fig. 2. Relationship between the relative mobility of As and the
ammonium oxalate-extractable Mn, Fe contents in the log-log
form
The amount of As released from samples KY-1000 and
KY-2000 increased rapidly within short extraction times, reaching
the apparent equilibrium after 174 min. The relative
mobility of As in KY-1000 and KY-2000 was approximately
s510
the same as in impoundment material although the total Fe,
Mn contents in KY-1000, 2000 are 2-times lower as compared
with KY-0. The total contents of elements Cd, Cr, Fe, Hg,
Mn, Pb, Zn, Al, As and Sb were determined after digestion
with acid mixture.
Conclusions
The fractions of As released in column experiments were
generally less than 10 % (5.32–7.83 %) of its total contents,
but they represented high absolute amounts of readily available
and water-soluble As (83 mg kg –1 ). The fraction released
from the source impoundment material (132 mg kg –1 ) represented
high As concentration in its leachates, reaching up to
8,000 μg dm –3 . As concentrations in the leachates from all
the samples exceed maximum permissible level in drinking
water (10 μg dm –3 ; Decision of the Slovak Health Ministry
no. 151/2004).
This work has been supported by the Slovak Grant
Agency under VEGA project No.1/2037/05.
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