Metais pesados e a dinâmica lacustre no Parque Ecológico do Tietê - Centro de Lazer Engenheiro Goulart - RMSP

Abstract

Suspended lacustrine sediments from the Tietê Ecological Park - Engenheiro Goulart Leisure Center, in the São Paulo Metropolitan Region, were retained by Millex filter units and examined using a scanning electron microscope (SEM). Different phytoplankton species were observed and heavy metals were detected in their organisms or structures parts, using point analyzes obtained by energy dispersive spectrometry (EDS). The EDS spectra showed mainly zinc, iron, manganese, chromium, nickel and copper associated with silicon, aluminum, sulfur, oxygen, phosphorus and calcium in the diatom frustules and Chloroflagellate species. These results together with chemical analyzes of the lake sediments and water permitted to verify their interaction and the degree of heavy metals adsorption. The SEM-EDS method provides additional observations and represents an analytical resource that supports the initial environmental diagnostics, and orients more detailed or specific studies using smaller samples of organisms than the traditional analytical methods.