Are acid volatile sulfides (AVS) important trace metals sinks in semi-arid mangroves?

Author(s)

Queiroz, Hermano Melo ^[1] ; Nobrega, Gabriel Nuto ^[1] ; Otero, Xose L. ^[2] ; Ferreira, Tiago Osorio ^[1]

Affiliation

^[1] Univ Sao Paulo ESALQ USP, Luiz de Queiroz Coll Agr, BR-13418900 Sao Paulo - Brazil

^[2] Univ Santiago de Compostela, Fac Biol, Dept Edafoloxia & Quim Agr, Santiago De Compostela 15782 - Spain

• Document type: Journal article
• Source: Marine Pollution Bulletin; v. 126, p. 318-322, JAN 2018.
• Web of Science Citations: 4

Abstract

Acid-volatile sulfides (AVS) formation and its role on trace metals bioavailability were studied in semi-arid mangroves. The semi-arid climatic conditions at the studied sites, marked by low rainfall and high evapotranspiration rates, clearly limited the AVS formation (AVS contents varied from 0.10 to 2.34 mu mol g(-1)) by favoring oxic conditions (Eh > + 350 mV). The AVS contents were strongly correlated with reactive iron and organic carbon (r =.0.84; r = 0.83 respectively), evidencing their dominant role for AVS formation under semi-arid conditions. On the other hand, the recorded Sigma SEM/AVS values remained > 1 evidencing a little control of AVS over the bioavailability of trace metals and, thus, its minor role as a sink for toxic metals. (AU)

• FAPESP's process: 17/08101-1 - Recovery of carbon stock and ecosystemic functions in replanted mangroves
• Grantee: Gabriel Nuto Nóbrega
• Support Opportunities: Scholarships in Brazil - Post-Doctoral