Sources of Cd, Cu, Ni and Zn in Portuguese coastal waters

Marie Hélène Cotté-Krief, Cecile Guieu, Alain J. Thomas, Jean Marie Martin

    Research output: Contribution to journalArticle

    Abstract

    In order to identify the major sources of trace metals (TM) in the Portuguese coastal waters, 58 surface water samples were collected during September 1988. The area sampled extended from the Tagus Estuary (down to a salinity of 25) to cape Ste Marie on the southern coast of Portugal. Dissolved metal concentrations in the fully marine waters ranged from 30 to 250 pM for Cd, 0.7-15 nM for Cu, 0.9-20 nM for Zn and 1.8-4.5 nM for Ni. Within the Tagus Estuary (salinity 25), concentrations increased to 3400 pM for Cd, 26 nM for Cu, 14 nM for Ni and 230 nM for Zn. The large-scale distribution of these metals is dominated by two strong continental sources, both probably linked to the exploitation of pyrite ores. In the Tagus Estuary, TM enrichments can be mostly attributed to a pyrite roasting plant located on the shore in front of Lisbon. Concerning the south Portuguese shelf waters, several hypotheses are proposed to explain their elevated metal concentrations. We particularly discussed the likely influence of the Tinto/Odiel rivers located 100 km eastward, an influence well known in the shelf waters of the Gulf of Cadiz. These rivers are extremely metal-rich because of acid mine tailings originating from their catchment. Between these two regions, upwelling of relatively metal-poor water largely contributes to the dilution of the continental inputs. Indeed, water exchanges on the shelf linked to the upwelling involve water fluxes 500 times higher than the Tagus River flow, and renew the coastal waters that are thus cleaned from terrestrial contamination. Contrary to many other upwelling systems in non-contaminated areas, the Portuguese upwelling does not act as a source of trace-metal enrichment of the continental margin waters. (C) 2000 Elsevier Science B.V.

    Original languageEnglish (US)
    Pages (from-to)199-214
    Number of pages16
    JournalMarine Chemistry
    Volume71
    Issue number3-4
    DOIs
    StatePublished - Sep 18 2000

    Fingerprint

    coastal water
    Water
    upwelling
    metal
    trace metal
    Metals
    estuary
    Estuaries
    water
    pyrite
    Rivers
    salinity
    water exchange
    river flow
    river
    tailings
    continental margin
    dilution
    Tailings
    catchment

    Keywords

    • Dissolved trace metals
    • Margin
    • Portugal
    • River input
    • Tagus Estuary
    • Tinto/Odiel rivers
    • Upwelling

    ASJC Scopus subject areas

    • Oceanography
    • Chemistry(all)
    • Environmental Chemistry
    • Water Science and Technology

    Cite this

    Cotté-Krief, M. H., Guieu, C., Thomas, A. J., & Martin, J. M. (2000). Sources of Cd, Cu, Ni and Zn in Portuguese coastal waters. Marine Chemistry, 71(3-4), 199-214. https://doi.org/10.1016/S0304-4203(00)00049-9

    Sources of Cd, Cu, Ni and Zn in Portuguese coastal waters. / Cotté-Krief, Marie Hélène; Guieu, Cecile; Thomas, Alain J.; Martin, Jean Marie.

    In: Marine Chemistry, Vol. 71, No. 3-4, 18.09.2000, p. 199-214.

    Research output: Contribution to journalArticle

    Cotté-Krief, MH, Guieu, C, Thomas, AJ & Martin, JM 2000, 'Sources of Cd, Cu, Ni and Zn in Portuguese coastal waters', Marine Chemistry, vol. 71, no. 3-4, pp. 199-214. https://doi.org/10.1016/S0304-4203(00)00049-9
    Cotté-Krief MH, Guieu C, Thomas AJ, Martin JM. Sources of Cd, Cu, Ni and Zn in Portuguese coastal waters. Marine Chemistry. 2000 Sep 18;71(3-4):199-214. https://doi.org/10.1016/S0304-4203(00)00049-9
    Cotté-Krief, Marie Hélène ; Guieu, Cecile ; Thomas, Alain J. ; Martin, Jean Marie. / Sources of Cd, Cu, Ni and Zn in Portuguese coastal waters. In: Marine Chemistry. 2000 ; Vol. 71, No. 3-4. pp. 199-214.
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