On the Choice of Working Conditions for the Determination of Trace Elements in the Composition of Sediments of Waste Waters of City Purification Plants
ZOYA N. AREFYEVA, HERMAN K. BUDNIKOV, SVETLANA Yu. SELIVANOVSKAYA, VENERA Z. LATYPOVA and DMITRY A. SEMANOV
Kazan, State University, Ul. Kremlevskaya 18, Kazan,
420008 (Russia), E-mail: Herman.Budnikov@ksu.ru
Pages: 379-386
Abstract
Various conditions of extraction of chemical elements (Cd, Zn, Cu, Cr, Mn, Pb, Ni, As, Hg) standardized in the composition of sediments of waste waters of urban purification works for their subsequent assay by the method of atomic absorption recommended for production control and estimation of sediments hazard class have been studied. It is demonstrated that the maximal extraction of Cd, Zn, Cu, Cr, Mn, Pb and Ni is achieved when using a mixture of nitric acid and hydrogen peroxide for heating. A special preparation of samples is recommended for extraction of Hg and As. Taking into account the results obtained with the help of the method proposed, the hazard class of real waste water sediments of urban purification works of Kazan and Naberezhnye Chelny has been calculated, and the possibility of their use as fertilizer has been estimated.
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