RAPID METHOD FOR EVALUATION OF METALLIC MOBILE FRACTION FROM SEWAGE SLUDGE SAMPLES
NICOLETA M. MARIN(1,2*), GABRIELA G. VASILE(1), MARIUS SIMION(1), LUOANA F. PASCU(1), CAROL B. LEHR(1)
1. National Research and Development Institute for Industrial Ecology, Drumul Podu Dambovitei no 71-73, district 6, Bucharest, Romania 2. University of Bucharest, Faculty of Chemistry, Department of Analytical Chemistry, Blvd. Regina Elisabeta, no 2-14, 030018, Bucharest, Romania *Corresponding author: nicoleta_mirela02@yahoo.com
Abstract
This study presents a modified extraction method for evaluation of mobile fraction from sewage sludge samples. The mobile content of As, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sb, Se and Zn was detected using three different single chemical extraction procedures and also the leaching test according to SR EN ISO 12457-2/2003 standard. The experimental data show that the optimal extraction method was the one with diethylenetriamine pentaacetic acid (DTPA), CaCl2 and triethanolamine (TEA) and a modified ratio solid: solution = 1 : 10 (mass per volume). The selected method provides a better assessment of the ability of metals to leach from sewage sludge during storage than leaching test method.