Benthic fluxes of trace metals in the lagoon of Venice

Positive fluxes for the Tresse and Campalto experiments were determined for Cd (0.21 and 0.18 pmol/cm2/h), Zn (62 and 67 pmol/cm2/h), Cu (0.29 and 0.50 pmol/cm2/h) and Mn (19 and 12 pmol/cm2/h), while negative fluxes were determined for iron (−3.5 and −6.3 pmol/cm2/h). Other elements showed differences in behaviour for the two experiments; the fluxes, for the Tresse and Campalto experiments, respectively, were 5.1 and −6.9 pmol/cm2/h for molybdenum, 0.25 and −0.18 pmol/cm2/h for arsenic and 1.3 and −8.4 pmol/cm2/h vanadium. Therefore, the different characteristics of the two areas affect the mobility of trace elements, which can derive from differences in the environmental characteristics of the two areas or seasonal difference in which the experiments were carried out.