Levels of nickel and vanadium, trace metals found in high concentration in
the oil spilled from the “Erika” tanker off Brittany (France) in December 1999
(41 ± 1 and 87 ± 3 mg kg−1 respectively), have been monitored
over a one-year period following this accidental event in several benthic
invertebrates. Ni and V in mussels (Mytilus edulis) and oysters (Crassostrea gigas) soft tissues were
analysed twice a month by graphite furnace atomic absorption spectrometry
and a scallop (Pecten maximus) shell daily growth bands were sampled every three bands by
laser ablation and analysed by ICP-MS for these two contaminants. Survey
data for mollusc tissues were compared with reference data arising from the
national monitoring database. Ni concentrations in dried tissues, comparable
with reference data (1.8 ± 0.9 µg g−1 in mussels and 1.2 ± 0.5 µg g−1 in oysters) do not show any additional input during
the whole period. Conversely, a sharp increase in vanadium concentrations
(up to 4.6 and 3.2 µg g−1 for mussels and oysters respectively) is
observed around May 2000, i.e. 5 months after the wreck, compared with the
monitoring data (1.4 ± 0.6 µg g−1 in mussels and 1.3 ± 0.6 µg g−1
in oysters). Furthermore, no Ni peak is detectable in
the time profiles of scallop shell growth bands where a V peak is observed
also in May 2000. This study shows that although a “mussel-watch-type”
network, based on the monitoring of vanadium concentration in mollusc
tissues, is able to identify contamination due to oil spills, similar
information might be obtained a posteriori by analysing daily growth bands of scallop
shells.