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:
*Name:
*Comment:
*Email:


(Date:10/13/2017)... ... October 13, 2017 , ... ProVest Insurance Group, ... Dallas, Miami, and Raleigh regions, is organizing an extended charity drive to benefit ... deadly chromosome abnormality. , After struggling since birth with several health challenges, T.J. ...
(Date:10/13/2017)... ... October 13, 2017 , ... The International Association of ... of excellence for the field of eating disorders, announces the opening of early ... in Orlando, Florida at the Omni Resort at ChampionsGate. , The ...
(Date:10/13/2017)... LUIS OBISPO, Calif. (PRWEB) , ... October 13, 2017 , ... ... Alzheimer’s or dementia. However, many long-term care insurance companies have a waiver for care ... is the 90-day elimination period, when the family pays for care, is often waived, ...
(Date:10/13/2017)... ... 2017 , ... Talented host, actor Rob Lowe, is introducing ... new episode of "Success Files," which is an award-winning educational program broadcasted on ... subject in-depth with passion and integrity. , Sciatica occurs when the sciatic nerve ...
(Date:10/12/2017)... ... October 12, 2017 , ... CitiDent and San ... using cutting-edge Oventus O2Vent technology. As many as 18 million Americans are ... cessation in breathing. Oral appliances can offer significant relief to about 75 percent ...
Breaking Medicine News(10 mins):
(Date:10/2/2017)... FLINT, Mich. , Oct. 2, 2017 ... acquired 8th Day Software and Consulting, LLC , ... 8th Day Software, based in Tennessee ... Management LLC. 8th Day expands EnvoyHealth,s service offerings for ... product development. "In ...
(Date:10/2/2017)... 2017 Halo Labs announces the European launch of their ... HORIZON at MIBio 2017 in Cambridge, U.K ... matter in biopharmaceutical samples with unprecedented speed and sensitivity while using ... Backgrounded Membrane Imaging. ... subvisible particle analysis system ...
(Date:9/28/2017)... Cohen Veterans Bioscience and Early Signal Foundation ... and home sensors for real-time monitoring of patients with ... nonprofit organization focused on disruptive health solutions for rare ... system to record and integrate behavioral, cognitive, physiological and ... ...
Breaking Medicine Technology:
Cached News: