Fate and tidal transport of butyltin and mercury compounds in the waters of the tropical Bach Dang Estuary (Haiphong, Vietnam)

► IHg and TBT are the principal mercury and butyltin species transported into the Bach Dang Estuary. ► MMHg and TBT are respectively methylated and degraded in the estuary during the dry season. ► The estuary appears as an important source of IHg and TBT to the coastal area during the wet season. ► During the wet season, TBT concentrations could present a significant environmental risk.