title: Trace metal pyritization variability in response to mangrove soil aerobic and anaerobic oxidation processes.
abstract: The degree of iron pyritization (DOP) and degree of trace metal pyritization (DTMP) were evaluated in mangrove soil profiles from an estuarine area located in Rio de Janeiro (SE Brazil). The soil pH was negatively correlated with redox potential (Eh) and positively correlated with DOP and DTMP of some elements (Mn, Cu and Pb), suggesting that pyrite oxidation generated acidity and can affect the importance of pyrite as a trace metal-binding phase, mainly in response to spatial variability in tidal flooding. Besides these aerobic oxidation effects, results from a sequential extraction analyses of reactive phases evidenced that Mn oxidized phase consumption in reaction with pyrite can be also important to determine the pyritization of trace elements. Cumulative effects of these aerobic and anaerobic oxidation processes were evidenced as factors affecting the capacity of mangrove soils to act as a sink for trace metals through pyritization processes.
authors.affiliation: Departamento de Geoquímica, Instituto de Química, Universidade Federal Fluminense, Niterói, RJ 24020-141, Brazil. Electronic address: wmachado@geoq.uff.br.
authors.forename: W
authors.initials: W
authors.lastname: Machado
authors.affiliation: Instituto de Geología de Costas y del Cuaternario (IGCyC), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, CC 722, Correo Central (7600) Mar del Plata, Buenos Aires, Argentina; Instituto de Investigaciones Marinas y Costeras (IIMyC), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. Electronic address: nlborrel@mdp.edu.ar.
authors.forename: N L
authors.initials: NL
authors.lastname: Borrelli
authors.affiliation: Departamento de Ciências do Solo, Universidade de São Paulo, ESALQ/USP Piracicaba, São Paulo, Brazil. Electronic address: toferreira@usp.br.
authors.forename: T O
authors.initials: TO
authors.lastname: Ferreira
authors.affiliation: Departamento de Ciências do Solo, Universidade de São Paulo, ESALQ/USP Piracicaba, São Paulo, Brazil. Electronic address: gisamarkes@yahoo.com.br.
authors.forename: A G B
authors.initials: AG
authors.lastname: Marques
authors.affiliation: Instituto de Geología de Costas y del Cuaternario (IGCyC), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, CC 722, Correo Central (7600) Mar del Plata, Buenos Aires, Argentina; Instituto de Investigaciones Marinas y Costeras (IIMyC), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. Electronic address: mosterri@yahoo.com.ar.
authors.forename: M
authors.initials: M
authors.lastname: Osterrieth
authors.affiliation: Laboratório de Geologia Marinha-LAGEMAR, Departamento de Geologia, Universidade Federal Fluminense, Niterói, RJ 24210-340, Brazil. Electronic address: cleverson@igeo.uff.br.
authors.forename: C
authors.initials: C
authors.lastname: Guizan
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D001938:Brazil; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D008670:Metals / Q000032:analysis* / Q000737:chemistry; D010084:Oxidation-Reduction; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D053833:Wetlands
chemical_list: D008670:Metals; D012987:Soil; D012989:Soil Pollutants; D013440:Sulfides; D014874:Water Pollutants, Chemical; C011342:pyrite; D007501:Iron
keywords: Metals; Pyrite oxidation; Pyritization; Redox processes; Sequential extraction