Article Abstract:
Trace element concentrations in the surf zone and coastal waters off Baja California, Mexico, exhibited pronounced spatial gradients. Metal concentrations in these waters ranged from 0.034-0.26 nM for Cd, 0.022-0.59 nM for Co, 0.93-3.6 nM for Cu and 3.6-6.4 nM for Ni. Offshore gradients were shown by metal concentrations, with the highest levels found nearshore. The relatively high nearshore concentrations were attributed to upwelling as well as to benthic particle resuspension and diagenetic remobilization. On the other hand, the mixing of oceanic waters from the North Pacific Central Gyre and biological scavenging seemed to have partly caused the relatively low offshore concentrations.
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Article Abstract:
Coastal surface waters in the Southern California Bight were subjected to silver concentration measurements. The character of silver in the coastal waters was demonstrated by offshore concentration gradient. Mass balance calculations were used to pinpoint the source of silver in US coastal waters and substantiated by elevated concentrations of silver relative to lead. It was found that wastewater discharges in coastal waters can be identified and traced by silver concentrations and lead/silver ratios.
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Article Abstract:
Implementation of the 1972 Clean Water Act has resulted in a 36-90% decrease in concentrations of Zn, Ni, Cd, and Cu in the surface waters of the Hudson River estuary.
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