Trace and Major Elements in Ash of "Nikola Tesla A" Power Plant Dump (II)-Associations of Elements in Active Cassette Ash

In order to establish associations of trace and major elements in dump coal ash taken from active, currently filled cassette of "Nikola Tesla A" power plant dump (Obrenovac near Belgrade, Serbia), eight samples of dump ash were subjected to a five-step sequential extraction, comprising of the following phases: distilled water, 1 M ammonium acetate, 0.2 M ammonium oxalate/0.2 M oxalic acid, acidic solution of H2O2, and 6 M solution of HCl. The obtained concentrations were subjected to correlation analysis, and results compared to those obtained by analysis of leached concentrations from fresh, lignite filter coal ash