New Isotopic Evidence for Chronic Lead Contamination in the San Francisco Bay Estuary System: Implications for the Persistence of past Industrial Lead Emissions in the Biosphere
Measurements of lead isotope compositions in unfiltered San Francisco Bay waters from 1989 to 1998 have brought new insights into the cycling of anthropogenic lead in estuaries. Isotopic compositions of lead in the shallow (
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| Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2000-10, Vol.97 (21), p.11181-11186 |
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| container_title | Proceedings of the National Academy of Sciences - PNAS |
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| creator | Steding, Douglas J. Dunlap, Charles E. Flegal, A. Russell |
| description | Measurements of lead isotope compositions in unfiltered San Francisco Bay waters from 1989 to 1998 have brought new insights into the cycling of anthropogenic lead in estuaries. Isotopic compositions of lead in the shallow ( |
| doi_str_mv | 10.1073/pnas.180125697 |
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Mass balance calculations indicate that only a small fraction (1-10%) of this leaded gasoline fallout from the late 1980s has been washed out of the San Joaquin and Sacramento rivers' drainage basin by 1995. Superimposed on this seasonal cycling was a long-term systematic shift in the component of gasoline lead expressed in the river systems, with a small (∼ 5-10% decrease in the amount of 1960s-1970s gasoline lead in river and North Bay waters. The retention of gasoline lead in the river systems draining into the bay as well as San Francisco Bay sediments indicates that historic gasoline deposits may remain in the combined riparian/estuarine system for decades. Such a persistence is in contraindication to recent reports of rapid (annual) decreases in lead contamination in other environments, and the link between climate and contaminant transport suggests local or global climate change will have an impact on contaminant distribution and fate.</description><identifier>ISSN: 0027-8424</identifier><identifier>EISSN: 1091-6490</identifier><identifier>DOI: 10.1073/pnas.180125697</identifier><identifier>PMID: 10984502</identifier><language>eng</language><publisher>United States: National Academy of Sciences of the United States of America</publisher><subject>Brackish ; Contamination ; Emissions ; Gasoline ; Geology ; Hydraulics ; Industrial Waste ; Lead ; Lead - analysis ; Lead isotopes ; Marine ; Physical Sciences ; River deltas ; River water ; Rivers ; San Francisco ; Sedimentary soils ; Sediments ; Surface water ; Water Pollutants, Chemical - analysis ; Water pollution</subject><ispartof>Proceedings of the National Academy of Sciences - PNAS, 2000-10, Vol.97 (21), p.11181-11186</ispartof><rights>Copyright 1993-2000 National Academy of Sciences of the United States of America</rights><rights>Copyright National Academy of Sciences Oct 10, 2000</rights><rights>Copyright © 2000, The National Academy of Sciences 2000</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a542t-94f6b69e51cc0a78dc32ef0b596a2e3cc629811a8796f9d6f3bcfd6530c4f8633</citedby><cites>FETCH-LOGICAL-a542t-94f6b69e51cc0a78dc32ef0b596a2e3cc629811a8796f9d6f3bcfd6530c4f8633</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Uhttp://www.pnas.org/content/97/21.cover.gif</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/123370$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/123370$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>230,314,727,780,784,803,885,27923,27924,53790,53792,58016,58249</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/10984502$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Steding, Douglas J.</creatorcontrib><creatorcontrib>Dunlap, Charles E.</creatorcontrib><creatorcontrib>Flegal, A. Russell</creatorcontrib><title>New Isotopic Evidence for Chronic Lead Contamination in the San Francisco Bay Estuary System: Implications for the Persistence of past Industrial Lead Emissions in the Biosphere</title><title>Proceedings of the National Academy of Sciences - PNAS</title><addtitle>Proc Natl Acad Sci U S A</addtitle><description>Measurements of lead isotope compositions in unfiltered San Francisco Bay waters from 1989 to 1998 have brought new insights into the cycling of anthropogenic lead in estuaries. Isotopic compositions of lead in the shallow (<2 m) southern reach were essentially invariant (∼ 90% derived from 1960s-1970s leaded gasoline) during the study period because of limited hydraulic flushing and the remobilization of lead from bottom sediments. In contrast, in the northern reach freshwater flushing from the San Joaquin and Sacramento rivers produced seasonal and decadal variations in lead isotope compositions. The seasonal shifts are attributed to advection of soils containing late 1980s gasoline lead into the bay during winter rains. Mass balance calculations indicate that only a small fraction (1-10%) of this leaded gasoline fallout from the late 1980s has been washed out of the San Joaquin and Sacramento rivers' drainage basin by 1995. Superimposed on this seasonal cycling was a long-term systematic shift in the component of gasoline lead expressed in the river systems, with a small (∼ 5-10% decrease in the amount of 1960s-1970s gasoline lead in river and North Bay waters. The retention of gasoline lead in the river systems draining into the bay as well as San Francisco Bay sediments indicates that historic gasoline deposits may remain in the combined riparian/estuarine system for decades. Such a persistence is in contraindication to recent reports of rapid (annual) decreases in lead contamination in other environments, and the link between climate and contaminant transport suggests local or global climate change will have an impact on contaminant distribution and fate.</description><subject>Brackish</subject><subject>Contamination</subject><subject>Emissions</subject><subject>Gasoline</subject><subject>Geology</subject><subject>Hydraulics</subject><subject>Industrial Waste</subject><subject>Lead</subject><subject>Lead - analysis</subject><subject>Lead isotopes</subject><subject>Marine</subject><subject>Physical Sciences</subject><subject>River deltas</subject><subject>River water</subject><subject>Rivers</subject><subject>San Francisco</subject><subject>Sedimentary soils</subject><subject>Sediments</subject><subject>Surface water</subject><subject>Water Pollutants, Chemical - analysis</subject><subject>Water pollution</subject><issn>0027-8424</issn><issn>1091-6490</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkk9v0zAYxiMEYt3gygUJLA6IS4r_JHGMuLCqg0oVIA3OluvY1FViZ7az0Y_FN8Rpyhgc4GTJ7-95Hz_Wk2VPEJwjSMnr3oowRzVEuKwYvZfNEGQorwoG72czCDHN6wIXJ9lpCDsIIStr-DA7SVBdlBDPsh8f1Q1YBRddbyRYXptGWamAdh4stt7ZdLlWogELZ6PojBXROAuMBXGrwKWw4MILK02QDpyLPViGOAi_B5f7EFX3Bqy6vjXyIAqHpaPss_LBpPlo5DToRYhgZZshRG9EO_ktOxPCQXX0Ojcu9Fvl1aPsgRZtUI-P51n29WL5ZfEhX396v1q8W-eiLHDMWaGrTcVUiaSEgtaNJFhpuClZJbAiUlaY1QiJmrJKs6bSZCN1U5UEykLXFSFn2dtpbz9sOtVIZaMXLe-96VJC7oThf06s2fJv7pojimiR5C-Pcu-uBhUiT4mkalthlRsCp5hgzIr6vyCiFCPCcAJf_AXu3OBt-gOO4UgwPNrOJ0h6F4JX-vbBCPKxMXxsDL9tTBI8uxvzDj5VJAHPj8Ao_DVmlGPEEUI1SsSrfxNcD20b1feY0KcTugvR-d9mmBAKyU-hneGH</recordid><startdate>20001010</startdate><enddate>20001010</enddate><creator>Steding, Douglas J.</creator><creator>Dunlap, Charles E.</creator><creator>Flegal, A. 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Superimposed on this seasonal cycling was a long-term systematic shift in the component of gasoline lead expressed in the river systems, with a small (∼ 5-10% decrease in the amount of 1960s-1970s gasoline lead in river and North Bay waters. The retention of gasoline lead in the river systems draining into the bay as well as San Francisco Bay sediments indicates that historic gasoline deposits may remain in the combined riparian/estuarine system for decades. Such a persistence is in contraindication to recent reports of rapid (annual) decreases in lead contamination in other environments, and the link between climate and contaminant transport suggests local or global climate change will have an impact on contaminant distribution and fate.</abstract><cop>United States</cop><pub>National Academy of Sciences of the United States of America</pub><pmid>10984502</pmid><doi>10.1073/pnas.180125697</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Brackish Contamination Emissions Gasoline Geology Hydraulics Industrial Waste Lead Lead - analysis Lead isotopes Marine Physical Sciences River deltas River water Rivers San Francisco Sedimentary soils Sediments Surface water Water Pollutants, Chemical - analysis Water pollution |
| title | New Isotopic Evidence for Chronic Lead Contamination in the San Francisco Bay Estuary System: Implications for the Persistence of past Industrial Lead Emissions in the Biosphere |
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