Water chemistry and nutrient release during the resuspension of FeS-rich sediments in a eutrophic estuarine system

► Resuspension of estuarine sediment caused rapid oxidation of FeS stores. ► Nutrients are released from eutrophic sediment in field and laboratory resuspensions. ► Laboratory resuspension of FeS-rich sediment released acid and deoxygenated water. ► No pH or oxygen decrease is evident during field resuspension of FeS-rich sediment. ► Sediment properties and system hydrodynamics affect water chemistry during dredging.