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The paper presents the results of determination of selected heavy metals (Cu, Cd, Cr and Ni) and selected organic acids (formic, lactic, acetic and propionic) in sewage sludge from the Waste Water Treatment Plant (WWTP) in Toruń, and in compost prepared from that sludge. The conditions of the organic acid extraction (the time and the temperature) and wet digestion method for the heavy metals determination...
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