title: Fate of copper complexes in hydrothermally altered deep-sea sediments from the Central Indian Ocean Basin.
abstract: The current study aims to understand the speciation and fate of Cu complexes in hydrothermally altered sediments from the Central Indian Ocean Basin and assess the probable impacts of deep-sea mining on speciation of Cu complexes and assess the Cu flux from this sediment to the water column in this area. This study suggests that most of the Cu was strongly associated with different binding sites in Fe-oxide phases of the hydrothermally altered sediments with stabilities higher than that of Cu-EDTA complexes. The speciation of Cu indicates that hydrothermally influenced deep-sea sediments from Central Indian Ocean Basin may not significantly contribute to the global Cu flux. However, increasing lability of Cu-sediment complexes with increasing depth of sediment may increase bioavailability and Cu flux to the global ocean during deep-sea mining.
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India. Electronic address: pchak@nio.org.
authors.forename: Parthasarathi
authors.initials: P
authors.lastname: Chakraborty
authors.affiliation: University of Otago, Department of Chemistry, NIWA/UO Research Centre for Oceanography, PO Box 56, Dunedin 9054, New Zealand.
authors.forename: Sylvia G
authors.initials: SG
authors.lastname: Sander
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India.
authors.forename: Saranya
authors.initials: S
authors.lastname: Jayachandran
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India.
authors.forename: B Nagender
authors.initials: BN
authors.lastname: Nath
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India.
authors.forename: G
authors.initials: G
authors.lastname: Nagaraju
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India.
authors.forename: Kartheek
authors.initials: K
authors.lastname: Chennuri
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India.
authors.forename: Krushna
authors.initials: K
authors.lastname: Vudamala
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India.
authors.forename: N
authors.initials: N
authors.lastname: Lathika
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India.
authors.forename: Maria Brenda L
authors.initials: MBL
authors.lastname: Mascarenhas-Pereira
mesh_terms: D003300:Copper / Q000032:analysis*; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D060086:Hydrothermal Vents; D019156:Indian Ocean; D008906:Mining; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D003300:Copper
keywords: Cu; Deep-sea sediment; Hydrothermal alteration; Kinetic extraction method; Metal-sediment interaction; Sequential extraction