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Trace metals partitioning among different sedimentary mineral phases and the deposit-feeding polychaete Armandia brevis.
Díaz-de-Alba, Margarita; Huerta-Diaz, Miguel Angel; Delgadillo-Hinojosa, Francisco; Hare, Landis; Galindo-Riaño, M Dolores; Siqueiros-Valencia, Arturo.
Afiliação
  • Díaz-de-Alba M; Department of Analytical Chemistry, Institute of Biomolecules (INBIO), Faculty of Sciences, CEI-MAR, University of Cadiz, Campus Rio S. Pedro, E-11510, Puerto Real, Cadiz, Spain.
  • Huerta-Diaz MA; Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Campus Ensenada, Km. 103 Carr. Tijuana-Ensenada, Ensenada 22800, Baja California, Mexico. Electronic address: huertam@uabc.edu.mx.
  • Delgadillo-Hinojosa F; Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Campus Ensenada, Km. 103 Carr. Tijuana-Ensenada, Ensenada 22800, Baja California, Mexico.
  • Hare L; Centre Eau Terre Environnement, 490, rue de la Couronne, Québec, Québec G1K 9A9, Canada.
  • Galindo-Riaño MD; Department of Analytical Chemistry, Institute of Biomolecules (INBIO), Faculty of Sciences, CEI-MAR, University of Cadiz, Campus Rio S. Pedro, E-11510, Puerto Real, Cadiz, Spain.
  • Siqueiros-Valencia A; Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Campus Ensenada, Km. 103 Carr. Tijuana-Ensenada, Ensenada 22800, Baja California, Mexico.
Sci Total Environ ; 543(Pt A): 248-266, 2016 Feb 01.
Article em En | MEDLINE | ID: mdl-26595396
Trace metals (Cd, Co, Cu, Fe, Mn, Ni, Pb, Zn) were determined in two operationally defined fractions (HCl and pyrite) in sediments from Ensenada and El Sauzal harbors (Mexico). The HCl fraction had significantly higher metal concentrations relative to the pyrite fraction in both harbors, underlining the weak tendency of most trace metals to associate with pyrite. Exceptionally, Cu was highly pyritized, with degrees of trace metal pyritization (DTMP) >80% in both harbors. Dissolved Fe flux measurements combined with solid phase Fe sulfide data indicated that 98 mt of Fe are precipitated as iron sulfides every year in Ensenada Harbor. These Fe sulfides (and associated trace metals) will remain preserved in the sediments, unless they are perturbed by dredging or sediment resuspension. Calculations indicate that dredging activities could export to the open ocean 0.20±0.13 to (0.30±0.56)×10(3) mt of Cd and Cu, respectively, creating a potential threat to marine benthic organisms. Degrees of pyritization (DOP) values in Ensenada and El Sauzal harbors were relatively low (<25%) while degrees of sulfidization (DOS) were high (~50%) because of the contribution of acid volatile sulfide. DOP values correlated with DTMP values (p≤0.001), indicating that metals are gradually incorporated into pyrite as this mineral is formed. Significant correlations were also found between DTMP values and -log(Ksp(MeS)/Ksp(pyr)) for both harbors, indicating that incorporation of trace metals into the pyrite phase is a function of the solubility product of the corresponding metal sulfide. The order in which elements were pyritized in both harbors was Zn≈Mn
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poliquetos / Poluentes Químicos da Água / Monitoramento Ambiental / Sedimentos Geológicos / Metais Pesados Limite: Animals País/Região como assunto: Mexico Idioma: En Revista: Sci Total Environ Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Espanha País de publicação: Holanda
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poliquetos / Poluentes Químicos da Água / Monitoramento Ambiental / Sedimentos Geológicos / Metais Pesados Limite: Animals País/Região como assunto: Mexico Idioma: En Revista: Sci Total Environ Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Espanha País de publicação: Holanda