Disponibilidade de chumbo em solos de manguezais da Bacia do Rio Subaé, Bahia, Brasil

Abstract

The amount of waste discarded in coastal areas has brought great environmental concern, with mangroves among the most affected ecosystems. Heavy metals are among the greatest environmental villain that when introduced into the aquatic environment, accumulate in sediments by natural or anthropogenic pathways. The accumulation of metals in the mangroves, poses a threat to these environments and can cross the entire ecological cycle involved in the ecosystem. This study aimed to investigate the total concentration, distribution and lead available in three profiles Gleysols Mangrove of Subaé Basin. They sampled horizons / layers three Gleysols profiles Tiomórficos potentially toxic sodium Orthic very poorly drained, with fluvial and maritime influences, evaluated the texture, organic carbon content, lead content (Pb) and the sequential extraction of this metal. The results indicated the trend in Pb P1> P2> P3. The profile 2, was the only profile where the Pb concentration was higher than those set by the Canadian legislation, which would imply potential risks to biological community, however, when this metal was measured by sequential extraction, it was observed that this risk does not exist. The biggest waste or inert Pb concentrations were detected in depth for all three profiles, confirming the low mobility of Pb in these environments.