Abstract
Distributions of dissolved Al in the Tamar Estuary have been recorded through spring-neap tidal cycles in winter and summer. Dissolved Al is a highly reactive constituent in this estuary, undergoing net removal in the very low salinity region and net input to the mid-estuary. The extent of both the depletion and the augmentation varied systematically with tidal energy input, indicating that tidal sediment disturbance was the principal controlling agency. These field data, supported by the results of laboratory simulations, show that the removal is regulated by sorption onto resuspended sediment particles, which dominates kinetically over authigenic aluminosilicate formation. Removal of dissolved Al by flocculation of riverborne colloids is not significant. The mid-estuarine input is consistent with dissolution of authigenic aluminosilicate following net remobilization of estuarine sediment. The internal cycling of Al in the estuary, generated by these processes, alters both the time-course and the soluble-particulate balance of the riverine discharge of Al to the adjacent coastal water.
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