Antimony addition occurs in the high salinity range of the Gironde Estuary.
Long estuarine residence times may favour Sb non-conservative behaviour.
Salinity and turbidity gradients determine antimony solid/liquid partitioning.
The first qualitative scenario of Sb radionuclide dispersion in the Gironde Estuary
Discharge and MTZ position control accidental Sb radionuclide dispersion.