HOME >> MEDICINE >> NEWS
Chronic lead contamination in San Francisco Bay shows long-term persistence of lead from past use of leaded gasoline

SANTA CRUZ, CA--The use of lead as a gasoline additive was phased out years ago in California, but an enormous reservoir of lead-contaminated soils and river sediments remains in the Central Valley and will continue to contaminate the waters of San Francisco Bay for decades to come, according to a study published in the September 12 issue of the Proceedings of the National Academy of Sciences.

The findings by researchers at the University of California, Santa Cruz, are based on an analysis of lead in water samples collected over a ten-year period in San Francisco Bay and the mouths of the Sacramento and San Joaquin Rivers. Although there is no evidence that lead pollution in San Francisco Bay threatens the health of humans or marine organisms, the study has implications for the persistence of a wide range of potentially harmful contaminants, said Russell Flegal, professor and chair of environmental toxicology at UCSC.

"We can use this as a model for other contaminants, and it shows that many contaminants simply don't go away once you stop polluting the environment," Flegal said. "We're seeing lead contamination from the 1960s still coming into the bay, and our calculations indicate it will be another 50 to 100 years before all the lead from gasoline emissions in the Central Valley is washed into the bay."

Even after lead stops entering the bay, lead-contaminated sediments are likely to remain there indefinitely, he added. These findings contrast with those of other researchers who have reported significant reductions of lead contamination in other types of environments. Since the phaseout of leaded gasoline, lead concentrations have fallen in urban air, ocean surface water, polar ice and snow, and even human blood. But the UCSC researchers now show that contaminated rivers and estuaries can retain pollutants like lead for a very long time.

Douglas Steding, a graduate student in Flegal's lab, is the first author of the study. The coauthors are Fl
'"/>

Contact: Tim Stephens
stephens@cats.ucsc.edu
831-459-4352
University of California - Santa Cruz
10-Sep-2000


Page: 1 2 3

Related medicine news :

1. Chronic pain treatments more effective when taken together, new study shows
2. Chronic fatigue patients show lower response to placebos
3. Chronic back pain shrinks thinking parts of the brain, study finds
4. Chronic sinusitis sufferers have enhanced immune responses to fungi
5. Chronic diseases need global health attention
6. Chronic care medicine: Physicians say help!
7. Chronic fatigue syndrome and Gulf War veterans
8. Chronic stress researcher to speak at NCCAMs Distinguished Lecture Series
9. Chronic cough significantly impacts life quality in women
10. Chronic diseases linked to falls in elderly women
11. Chronic fatigue syndrome is rare in children

Post Your Comments:
(Date:11/23/2014)... 24, 2014 Tbdress.com has recently ... online on Nov. 28, 2014. The special offer will provide ... Tbdress.com is one of the world’s largest women’s dresses retailers, ... colors. People can enjoy great discounts on that day: Everything ... free delivery (for orders above $89). , People can use ...
(Date:11/23/2014)... 2014 Nearly 260 testosterone lawsuits ... deep vein thrombosis and other serious cardiovascular events ... litigation (MDL) underway in the Northern District of ... documents updated on November 17th by the U.S. ... filing of 259 lawsuits against the makers of ...
(Date:11/23/2014)... Nov. 23, 2014 (HealthDay News) -- The holidays can ... because sensory overload can trigger major meltdowns, an expert ... the best of circumstances, but when you have children ... Gibbs, an occupational therapy professor at University of the ... "It,s best to let your hosts or visitors ...
(Date:11/23/2014)... 2014 This evaluation provides a ... significance, programs and manufacturing technological innovation. Then, the ... market gamers in information. In this part, the ... manufacturing value, and 2009-2014 market shares for each ... the globally and Chinese suppliers finish market of ...
(Date:11/23/2014)... (PRWEB) November 23, 2014 SWAccessControl.com's high ... global market. Recently, the company has announced its new ... special offer on these high quality power suppliers. All ... 30% off. The special offer lasts until Dec. 20, ... many of them have been supporting it for a ...
Breaking Medicine News(10 mins):Health News:Tbdress.com Special Friday Shoes Sales Online Now 2Health News:Testosterone Lawsuits Approach 260 in Illinois Federal Court Litigation, Bernstein Liebhard LLP Reports 2Health News:Testosterone Lawsuits Approach 260 in Illinois Federal Court Litigation, Bernstein Liebhard LLP Reports 3Health News:Holidays Can Be Sensory Overload for Kids With Autism 2Health News:Femoral Stems Industry 2014 Analysis & 2019 Forecasts for Global and Chinese Region in New Research Report at ReportsnReports.com 2Health News:Femoral Stems Industry 2014 Analysis & 2019 Forecasts for Global and Chinese Region in New Research Report at ReportsnReports.com 3Health News:Femoral Stems Industry 2014 Analysis & 2019 Forecasts for Global and Chinese Region in New Research Report at ReportsnReports.com 4Health News:Cheap Access Control Power Supplies Online Now at SWAccessControl.com, Special Offer Until Dec. 20, 2014 2
(Date:11/22/2014)... 22, 2014  Sprout Pharmaceuticals today announced positive preliminary results ... treated with flibanserin up to 200 mg at bedtime had ... at the 20 th Annual Fall Scientific Meeting of ... in Miami . The ... Complete Response Letter and the Formal Dispute Resolution that was ...
(Date:11/22/2014)... --  Long Beach dentist , Dr. Rassouli, is now offering ... in tooth replacement because they offer the closest match to ... and preserve smiles and improve overall dental health. Dr. Rassouli ... as a part of a smile makeover or full mouth ... smile. The loss of a tooth can lead ...
(Date:11/22/2014)... Nov. 21, 2014 Research and Markets  has ... Drug Industry Report, 2014-2017" report to their offering. ... The Chinese recombinant protein drug market has been expanding ... ability and the like. During 2005-2013, sales of recombinant ... a CAGR of 19.1%, and it is projected that ...
Breaking Medicine Technology:Sprout Pharmaceuticals Presents Phase 1 Clinical Trial Data Showing Treatment With Flibanserin Results In No Next-Day Driving Impairment 2Sprout Pharmaceuticals Presents Phase 1 Clinical Trial Data Showing Treatment With Flibanserin Results In No Next-Day Driving Impairment 3Long Beach Dentist, Dr. Rassouli, is Now Offering Dental Implants 2China Recombinant Protein Drug Industry Report, 2014-2017 2China Recombinant Protein Drug Industry Report, 2014-2017 3
Cached News: