NDLI: Historical trends of trace metals in a sediment core from a contaminated tidal salt marsh in San Francisco Bay

Content Provider	Springer Nature Link
Author	Hwang, Hyun Min Green, Peter G. Young, Thomas M.
Copyright Year	2008
Abstract	Sedimentation of metals preserves historical records of contaminant input from local and regional sources, and measurement of metals in sediment cores can provide information for reconstruction of historical changes in regional water and sediment quality. Sediment core was collected from Stege Marsh located in central San Francisco Bay (California, USA) to investigate the historical input of trace metals. Aluminum-normalized enrichment factors indicate that inputs from anthropogenic sources were predominant over natural input for Ag, Cu, Pb, and Zn. Among these, lead was the most anthropogenically impacted metal with enrichment factors ranging from 32 to 108. Depth profiles and coefficients of variation show that As, Cd, and Se were also influenced by anthropogenic input. The levels of these anthropogenically impacted metals decline gradually towards the surface due to regulation of the use of leaded gasoline, municipal and industrial wastewater discharge control, and closure of point sources on the upland of Stege Marsh. Although trace metal contamination is expected to be continuously declining, the rates of decline have slowed down. For lead, it is estimated to take 44, 82, and 153 years to decrease to probable effects level (112 μg/g), the San Francisco Bay ambient surface sediment level (43.2 μg/g), and the local baseline levels (5 μg/g), respectively. Some metals in surface sediments (0–6 cm) are still higher than sediment quality guidelines such as the probable effects level. To further facilitate the recovery of sediment quality, more efficient management plans need to be developed and implemented to control trace metals from non-point sources such as stormwater runoff.
Starting Page	421
Ending Page	430
Page Count	10
File Format	PDF
ISSN	02694042
Journal	Environmental Geochemistry and Health
Volume Number	31
Issue Number	4
e-ISSN	15732983
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-08-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sediment core Metals Enrichment factors Anthropogenic input Tidal salt marsh Atmospheric Protection/Air Quality Control/Air Pollution Public Health/Gesundheitswesen Geochemistry Environment
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Medicine Geochemistry and Petrology Environmental Engineering Water Science and Technology

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