Metals in SF Estuary Only US estuary with systematic, long-term monitoring Most peer-reviewed...
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![Page 1: Metals in SF Estuary Only US estuary with systematic, long-term monitoring Most peer-reviewed publications of any US estuary (Sañudo-Wilhelmy et al., 2004)](https://reader030.fdocuments.us/reader030/viewer/2022032805/56649ef15503460f94c01b41/html5/thumbnails/1.jpg)
Metals in SF Estuary
Only US estuary with systematic, long-term monitoring
Most peer-reviewed publications of any US estuary
(Sañudo-Wilhelmy et al., 2004)
![Page 2: Metals in SF Estuary Only US estuary with systematic, long-term monitoring Most peer-reviewed publications of any US estuary (Sañudo-Wilhelmy et al., 2004)](https://reader030.fdocuments.us/reader030/viewer/2022032805/56649ef15503460f94c01b41/html5/thumbnails/2.jpg)
Metals in SF Estuary
OLD NEWS
(Sañudo-Wilhelmy et al., 2004)
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Environmental ResearchPollutants in SF Bay (Sept. 2007)
Synthesis of decades of high quality data - truly remarkableonly possible for SF Bay
Multiplicity & Diversity of Institutions - truly remarkableacademia (UCD, UCSC, Maryland)state & federal agencies (SWRCB, USGS, USF&WS)ngo’s (SFEI)industry (AMS, CH2MHill, Tetra Tech)
![Page 4: Metals in SF Estuary Only US estuary with systematic, long-term monitoring Most peer-reviewed publications of any US estuary (Sañudo-Wilhelmy et al., 2004)](https://reader030.fdocuments.us/reader030/viewer/2022032805/56649ef15503460f94c01b41/html5/thumbnails/4.jpg)
Articles on Metals in Special Issue
Buck et al. - copper Yee et al - nickelFlegal et al. - silver Conaway et al. - mercurySchoellhamer et al. - sediments Anderson et al. - toxicityThompson et al. - toxicity
Other new reports: Black et al. (2007) MMHg Complexation Huerta-Diaz et al.(2007) Metals in Porewater Luengen et al. (2007) Metals & Plankton Conaway et al. (in press) Hg Review (in press) …………
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Metals in SF BayLots of Interest & Lots of Data
(Buck et al., 2007)
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Comparability of RMP Data
Trace metal clean tech.
valid
Rigorous QA/QC
statistical analyses
Evolving methodologies
intercalibrated
Published - sci. journals
accessible reproducible
(Ndung’u et al., 2006)
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Total Dissolved (< 0.45 µm)* Copper
* Historic basis for water quality criteria (Cu in SF Bay > WQC)17 - 44% decline throughout the estuary (1993-2001)positively correlated with DOC (p < 0.0005)
Consistent with complementary speciation measurementsorganic ligands typically bind >99.9% dissolved Cu in SF Bay
Site-specific criteria for copper in SF Bay are being developed (Buck et al., 2007)
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Nickel
Ni concentrations ~ constant (1992-2005)
Most “total dissolved” Ni is also strongly complexed
Water quality objectives for Ni also being reconsidered
(Yee et al., 2007)
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Silver
Temporal decrease in Central & South Bayswater & sediments & biotaconcentrations may still be toxic
Temporal increase in northern reachnew inputs or increased remobilization?
(Flegal et al., 2007)
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Mercury
*Significant (p<0.05) decrease of Hg in sediments @ 8 locations (1993-2001)
NO associated decrease of Hg in sport fish or bivalvesHg(total) ≠MMHgrelative increase in MMHg production ?
(Conaway et al., 2007)
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Sediments ~ Metals
Pronounced temporal & spatial variability of metals~ sediment fluxes
Suspended sediments (SSC) a proxy for metalsfaster & cheaper
BUT sediment transport in the Bay is changingnegative sediment budget
(Schollhamer et al., 2007)
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How can things be worse - when they’re better ?
reduced contemporary industrial inputs +
negative sediment budget -
erosion of surface sediments -
increased remobilization of historic inputs ?
(Conaway et al., 2005)
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How can things be worse - when they’re better?
on-going inputs of contaminated sedimentshistoric & contempporary
SF Bay is a trap for metals continuous recycling of metals
metals never degrade
(Steding et al., 2000)
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Summary
Hg is toxic in SF Bay (biota & humans)
Cu appears to still be toxic in sediments
Ag may still be toxic in sediments
Cd may still be toxic in sediments
Metal toxicity may be increasing in SF Bay
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Acknowledgments
USGS (McColluch, Conomos, Peterson, Nichols, …)
SF-RWQCB (Carlin, Ritchie, Mumley, Taberski, …)
AMS (Spies, Gunther, Salop, Johnson,…)
SFEI (Thompson, Hoenicke, Davis, Yee, Lowe, Sedlak, …)
Funding Agencies, Municipalities, Industries (Tucker, …)