Dissolved Aluminum in the Upper St. Lawrence Estuary

摘要: The concentrations of dissolved aluminum (Al) in the upper St. Lawrence Estuary were determined during periods high and intermediate river-discharge. Laboratory experiments simulating estuarine processes also conducted order to examine possible mechanisms controlling Al distribution. During river-discharge, concentration at river end-member was 1.63 µM decreased exponentially with increasing salinity. An almost complete removal observed low salinity area up 10 an intensive turbidity maximum zone. Principal responsible for inferred from laboratory flocculation adsorption onto suspended particulate matter (SPM). 0.72 again However, less pronounced, being only about 25%. Good fits model predictions suggest that principal authigenic aluminosilicate formation SPM. In Estuary, distribution is controlled by a combination three mechanisms: flocculation, formation, adsorption. Each mechanism can become dominant factor depending on level speciation water.