Interstitial water chemistry of villefranche bay sediments: Trace metal diagenesis

J. F. Gaillard*, C. Jeandel, G. Michard, E. Nicolas, D. Renard

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Pore water aliquots were taken with an in situ close interval sampler: the "Peeper". We report here the pore water concentration profiles of TCO2, SO4, TH2S, Ca and the trace metals Mn, Cu, Pb, Cd and Cr from sediments of a relatively polluted area, the Villefranche Bay, on the French Riviera (close to Nice). We investigated the major ion concentrations in order to establish geochemical mass balances of organic matter oxidation. ΔTCO2/ΔSO4 was <-2.0, reflecting the precipitation of calcite as confirmed by the calcium profile. Reduction of sulfate led to increasing sulfide concentrations with depth. Trace metal interstitial water concentrations decreased from 63 to 5 nM, 18 to 4 nM and 6.6 to less than 2 nM for Cu, Pb and Cr, respectively. Cd showed a different pattern with top and deep values of 0.7 nM and a minimum of 0.27 nM. Thermodynamic calculations were performed which suggest the potential formation of mineral phases such as sulfides.

Original languageEnglish (US)
Pages (from-to)233-247
Number of pages15
JournalMarine Chemistry
Volume18
Issue number2-4
DOIs
StatePublished - Mar 1986

ASJC Scopus subject areas

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

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