Spatial and temporal variations in silver contamination and toxicity in San Francisco Bay
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Abstract
Although San Francisco Bay has a "Golden Gate", it may be argued that it is the "Silver Estuary". For at one time the Bay was reported to have the highest levels of silver in its sediments and biota, along with the only accurately measured values of silver in solution, of any estuarine system. Since then others have argued that silver contamination is higher elsewhere (e.g., New York Bight, Florida Bay, Galveston Bay) in a peculiar form of pollution machismo, while silver contamination has measurably declined in sediments, biota, and surface waters of the Bay over the past two to three decades. Documentation of those systemic temporal declines has been possible because of long-term, ongoing monitoring programs, using rigorous trace metal clean sampling and analytical techniques, of the United States Geological Survey and San Francisco Bay Regional Monitoring Program that are summarized in this report. However, recent toxicity studies with macro-invertebrates in the Bay have indicated that silver may still be adversely affecting the health of the estuarine system, and other studies have indicated that silver concentrations in the Bay may be increasing due to new industrial inputs and/or the diagenetic remobilization of silver from historically contaminated sediments being re-exposed to overlying surface waters and benthos. Consequently, the Bay may not be ready to relinquish its title as the "Silver Estuary".
Study Area
Publication type | Article |
---|---|
Publication Subtype | Journal Article |
Title | Spatial and temporal variations in silver contamination and toxicity in San Francisco Bay |
Series title | Environmental Research |
DOI | 10.1016/j.envres.2007.05.006 |
Volume | 105 |
Issue | 1 |
Year Published | 2007 |
Language | English |
Publisher | Elsevier |
Contributing office(s) | Toxic Substances Hydrology Program |
Description | 19 p. |
Larger Work Type | Article |
Larger Work Subtype | Journal Article |
Larger Work Title | Environmental Research |
First page | 34 |
Last page | 52 |
Country | United States |
State | California |
Other Geospatial | San Francisco Bay |
Google Analytic Metrics | Metrics page |