Abstract
Freshwater mental contaminants which in the estuary tend to precipitate into intertidal surface sediments during freshwater-seawater mixing because of heavy water chemical reaction. The impacts of ferric hydroxide on the removal rate of Cr with increasing pH and salinity were conducted by laboratory simulation experiment. The removal rate of Cr by ferric hydroxide decreased with increasing pH from river water to seawater in the estuary; this is because pH changed the Zeta potential of ferric hydroxide. And with increasing salinity, the removal rate of Cr by ferric hydroxide firstly decreased and then increased. On the hand, Na+ entering the sliding surface, which could improve Zeta potential and stability of ferric hydroxide colloid, which leads to the amount of Cr removal by colloid aggregation decreased. On the other hand, there was competitive adsorption between Cland CrO42-/HCrO4-. In this study, Fe was the key factor of heavy metal Cr distribution with pH change.
Highlights
An estuary acts as a zone of land-sea interaction in which runoff from the land mixes with seawater
The impacts of salinity and suspended particulate matter in freshwater-seawater mixing zone on partition coefficient (Kd) have been reported [5], noting that heavy metals such as As, Cd and Cr were more susceptible to variations in salinity it is meaningful to investigate the interaction theory between Fe and Cr when the salinity and pH changes in the estuary
In this study, simulated interior batch experiments were used, keeping the value of pH in the reaction system, and increase the concentration of NaCl to represent the changes of salinity in the estuary area, the Fe and Cr were monitored to investigate the interaction between them with long-term salinity changes in the estuary
Summary
An estuary acts as a zone of land-sea interaction in which runoff from the land mixes with seawater. It is a water body where freshwater, brackish water and seawater are present simultaneously [1]. The impacts of salinity and suspended particulate matter in freshwater-seawater mixing zone on partition coefficient (Kd) have been reported [5], noting that heavy metals such as As, Cd and Cr were more susceptible to variations in salinity it is meaningful to investigate the interaction theory between Fe and Cr when the salinity and pH changes in the estuary. In this study, simulated interior batch experiments were used, keeping the value of pH in the reaction system, and increase the concentration of NaCl to represent the changes of salinity in the estuary area, the Fe and Cr were monitored to investigate the interaction between them with long-term salinity changes in the estuary
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