Abstract: Stabilized sewage sludge from the wastewater treatment plant in Ostrowiec Św. was analyzed in accordance with the
extraction method proposed by the Community Bureau of Reference (BCR). Zinc, cadmium, lead and nickel were determined
by means of the standard addition with the use of the Perkin-Elmer 3100-BG FAAS atomic absorption spectrophotometer
(with the background correction function turned on). Chromium and copper were tested using the FAAS technique. In order
to determine mercury the CVAAS method was employed. The sequence analysis revealed the presence of heavy metals in
all fractions. It should be strongly emphasised that organometallics and aluminosilicates constitute the most prevalent forms
of metals under consideration. On the basis of the investigations, it can be concluded that the dominant forms of heavy
metals are immobile. It was shown that the total content of heavy metals in the sewage sludge does not provide an objective
criterion for the environmental risk evaluation.
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