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:6/27/2017)... ... 27, 2017 , ... East Los Angeles dentist, Ramin Assili DDS , ... What happens to a woman during pregnancy can have profound effects on a developing ... toll on a baby’s long-term health. This study, which was performed at the University ...
(Date:6/26/2017)... ... 26, 2017 , ... Torrance dentist, Dr. Robert Mondavi DDS , is ... noticeable aspects of a person’s appearance. A healthy, radiant smile can make a person ... teeth, everyone can have the smile of their dreams with cosmetic dentistry. , “The ...
(Date:6/26/2017)... , ... June 26, 2017 , ... ... Fertility & Sexual Medicine Specialists, in collaboration with the Fertility Center of California, ... fertility care: PESA (percutaneous epidydimal sperm aspiration) and TESA (percutaneous testicular sperm extraction). ...
(Date:6/26/2017)... ... June 26, 2017 , ... ... recent review of government data released by the United Soybean Board. , ... Maryland’s soybean farmers have increased their productivity on less land per bushel, the ...
(Date:6/26/2017)... CA (PRWEB) , ... June 26, 2017 , ... ... qualified mental health professionals in every state across the country to join its online ... and rewarding way for therapists to reach a substantially greater number of people in ...
Breaking Medicine News(10 mins):
(Date:5/30/2017)... Holdings, Inc. (NYSE: HRC), will present at the Goldman Sachs ... 13, 2017, in Rancho Palos Verdes, California ... officer, is scheduled to present at 3:20 p.m. Pacific Time. ... http://ir.hill-rom.com/events.cfm . A recorded replay will be available one ... 2017. About Hill-Rom ...
(Date:5/26/2017)... SANTA BARBARA, Calif. , May 25, 2017 /PRNewswire-USNewswire/ ... the United States , Direct Relief is working ... of overdose-reversing Naloxone available at no cost to community ... and other nonprofit providers nationwide. "Pfizer ... expanding access to medicines and ensuring patient safety through ...
(Date:5/22/2017)... 22, 2017  As the specialty pharmacy industry ... to make the revolutionary shift from volume-based to ... ensuring positive patient outcomes and shaping the future ... focus away from clinical trials and toward data ... specialty drug therapy utilization in precise patient populations. ...
Breaking Medicine Technology:
Cached News: