Hiri-lurzoruetako metalen eta metaloideen edukiaren eta bioeskuragarritasunaren ebaluazioa

Abstract

Urban soils may contain different metals, some of them being toxic. Metals and metalloids can enter the human body by direct inhalation, ingestion or dermic absorption. Taking into account that 200 mg·day-1 is the average daily ingested dose of soil for children aged from 1 to 12, in vitro methodologies have been proposed for the quantification of the metal fraction mobilized from soils during the digestion process. SBET (Simplified Bioaccessibility Extraction Test) method simulates the human gastric conditions. A total of 27 urban soils were collected in leisure areas from San Sebastian to evaluate the bioaccessibility of metals and metalloids (Fe, Ni, Zn, As, Cr, Cd and Pb). Although the concentration of the examined metals is below the Indicative Evaluation Value (B-EBA) defined in the Soils Law (4/2015), the SBET method has provided the identification of Zn, Pb and Cd as the most bioaccessible metals.