Trace metal concentrations in the surf zone and in coastal waters off Baja California, Mexico

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.

Metals, Metals (Materials), Baja California, Mexico (State), Water analysis, Trace pollutants

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Anthropogenic silver in the Southern California Bight: a new tracer of sewage in coastal waters

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.

Usage, Silver, Coasts, Tracers (Chemistry), Southern California Bight

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Impact of the Clean Water Act on the levels of toxic metals in urban estuaries: the Hudson River revisisted

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.

Chemical Manufacturing, New York, Pollutants produced & recycled, Toxic Chemical Wastes, Statistical Data Included, Pollution, Chemical industry, Estuaries, Hazardous wastes, Hudson River Valley, Chemical wastes

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