Navigation Links
Stanford scientists find new solutions for the arsenic-poisoning crisis in Asia
Date:3/25/2009

e could really track the entire water flow."

Field results

The new field site was located just south of Cambodia's capital, Phnom Penh. Fendorf hired local workers to drill wells at three different depths throughout the 20-square-mile site. Testing the water for dissolved arsenic at various depths allowed the researchers to pinpoint where the toxin was migrating into the aquifer. To observe solids, they also installed water-sampling devices a foot or two below the surface. The data they collected allowed them to put together a model of arsenic cycling in the river delta.

"We found out that, sure enough, within the first 2 to 3 feet from the surface, arsenic was coming out of the solids-that is, the sediments transported down from the Himalayas-and into the water, and then it migrated down into the aquifer," Fendorf said. Aquifers are the source of drinking water for people who use wells throughout Cambodia, Bangladesh, Myanmar, India and Vietnam.

The culprits responsible for dissolving the arsenic turned out to be bacteria that live in the soil and sediment of the river basin. The researchers discovered that arsenic flowing down the river from the Himalayas sticks to rust particles called iron oxides. Upon reaching the river delta, these arsenic-laden particles are buried by several layers of soil, creating an oxygen-free, or anaerobic, environment. Normally, bacteria use oxygen to breathe. But in an anaerobic environment, they can use other chemicals, including rust and arsenic. As the bacteria metabolize the iron and arsenic, they convert it to a form that readily dissolves in water.

"As these sediments get buried very rapidly, the bacteria go through an anaerobic metabolism that dissolves the iron minerals and the arsenic with it," Fendorf said. "The arsenic goes into the water and the problem starts."

The results, published in the journal Nature, confirmed Fendorf's hypothesis: Arsenic contamina
'/>"/>

Contact: Mark Shwartz
mshwartz@stanford.edu
650-723-9296
Stanford University
Source:Eurekalert

Page: 1 2 3 4 5 6

Related biology news :

1. Americans remain pessimistic about the environment, Stanford-AP survey finds
2. Stanford/Packard researchers find disease genes hidden in discarded data
3. Stanford researchers say climate change will significantly increase impending bird extinctions
4. Stanfords nanowire battery holds 10 times the charge of existing ones
5. Stanford researchers publish review of US medical device regulation
6. Stanford researchers make first direct observation of 3-D molecule folding in real time
7. Stanford researchers say living corals thousands of years old hold clues to past climate changes
8. Group led by Stanford physicist says theres an urgent need for nuclear detectives
9. Stanford researchers developing 3-D camera with 12,616 lenses
10. Clues to ancestral origin of placenta emerge in Stanford study
11. Inflammation triggers cell fusions that could protect neurons, Stanford research shows
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/5/2015)... TRIANGLE PARK, North Carolina , 5. ... sein 35. Jahr als spezialisiertes Logistikunternehmen und ... Position als einzige klinische Logistikfirma (Clinical Logistics ... Die Kernbotschaft der neuen Kampagne lautet ... und Lieferungen. Foto: http://photos.prnewswire.com/prnh/20150205/173753 ...
(Date:2/5/2015)... , Jan. 26, 2015   Epic Sciences , a ... today announced that Murali Prahalad , Ph.D., president and ... World Conference (PMWC) 2015: Silicon Valley, which is taking ... View, Calif. on January 26-28, 2015. ... of Age as Biomarkers." Last year, Epic Sciences was a ...
(Date:2/5/2015)... Jan. 27, 2015   Marvin Test ... deployed, innovative test solutions for military, aerospace, ... of its TS-323 GENASYS Test Platform ... (LMSSC). GENASYS is a high-performance PXI-based system ... applications that require performance functional testing. GENASYS ...
Breaking Biology News(10 mins):Marken startet Kampagne mit Patienten im Mittelpunkt 2Marken startet Kampagne mit Patienten im Mittelpunkt 3Epic Sciences to Present at Personalized Medicine World Conference 2015 on the Use of Circulating Tumor Cells as Cancer Biomarkers 2Marvin Test Solutions' GENASYS Platform Advances Mission-Critical Aerospace Production Test 2Marvin Test Solutions' GENASYS Platform Advances Mission-Critical Aerospace Production Test 3Marvin Test Solutions' GENASYS Platform Advances Mission-Critical Aerospace Production Test 4
... linked to too much growth in patients has now ... the gene can lead to very different conditions, according ... Genetics . IMAGe* syndrome is a rare developmental ... than average body and organ size. Without treatment, the ...
... PHILADELPHIA By pairing an intimate knowledge of immune-system ... cross-disciplinary team at the University of Pennsylvania has arrived ... strategy to track down parasites that is similar to ... tuna use to hunt their prey. ...
... Researchers reporting online on May 24 in the Cell ... evidence that areas closed to all fishing are helping ... scientists applied a forensic DNA profiling approach to track ... of marine reserves on Australia,s Great Barrier Reef. , ...
Cached Biology News:Variations of a single gene can lead to too much or too little growth, study shows 2T cells 'hunt' parasites like animal predators seek prey, a Penn Vet-Penn Physics study reveals 2T cells 'hunt' parasites like animal predators seek prey, a Penn Vet-Penn Physics study reveals 3T cells 'hunt' parasites like animal predators seek prey, a Penn Vet-Penn Physics study reveals 4DNA evidence shows that marine reserves help to sustain fisheries 2
(Date:3/5/2015)... -- Twelve patients today are preparing to participate in a ... Pacific Medical Center (CPMC), a Sutter Health affiliate. ... the largest single-center kidney paired donation chain conducted on ... 44-year history of the CPMC Transplant Center. The two-day ... donor who did not have a specific recipient in ...
(Date:3/5/2015)... Buffalo, New York (PRWEB) March 05, 2015 ... want veterans to be able to get an Advanced ... Time, money, stress, blaming and guessing are all risk ... with assuming the woman is the source of the ... and female. LifeCell Dx has the simplest, least ...
(Date:3/5/2015)... BioPlus Specialty Pharmacy (BioPlus) announces the hiring ... of Managed Care. In this role, Damm will build ... nation’s leading specialty pharmacies. , Damm, who is based ... pharmacy and biotech experience to his new position with ... and Pfizer. Prior to working in Healthcare Damm served ...
(Date:3/5/2015)... (PRWEB) March 05, 2015 North ... Pierre Noel, M.D., Professor of Medicine, Mayo Clinic ... Company’s Board of Directors. , Entegrion’s ... extremely fortunate to have Dr. Noel, a distinguished ... healthcare organization, join Entegrion’s Board. His expertise in ...
Breaking Biology Technology:Altruistic donor starts large West Coast single-center kidney paired donation at CPMC 2Altruistic donor starts large West Coast single-center kidney paired donation at CPMC 3Altruistic donor starts large West Coast single-center kidney paired donation at CPMC 4LifeCell Dx Offers New Option to Veterans with Infertility 2LifeCell Dx Offers New Option to Veterans with Infertility 3BioPlus Specialty Pharmacy Announces Hiring of New Vice President of Managed Care: Jamie Damm 2Entegrion Announces Appointment of Pierre Noel, MD, to Its Board of Directors 2
... to empathize with others is partially determined by genes, ... of Wisconsin-Madison and Oregon Health and Science University (OHSU). ... mice learned to associate a sound played in a ... mouse in that cage respond with squeaks of distress. ...
... & Johnson Pharmaceutical Research & Development, L.L.C. (J&JPRD) ... (FDA) has asked for additional information regarding the ... CONSTA(R) (risperidone) Long-Acting Injection. The sNDA, submitted in ... adjunctive maintenance treatment to delay the occurrence of ...
... Life Sciences Companies to Accelerate Time to Value ... Inc., the global leader empowering enterprises to realize ... formation of a partnership with Ceiba Solutions, Inc., ... business application integrations to help customers achieve a ...
Cached Biology Technology:Mouse study reveals genetic component of empathy 2Mouse study reveals genetic component of empathy 3FDA Issues Complete Response Letter for RISPERDAL(R) CONSTA(R) for the Adjunctive Maintenance Treatment of Bipolar Disorder 2FDA Issues Complete Response Letter for RISPERDAL(R) CONSTA(R) for the Adjunctive Maintenance Treatment of Bipolar Disorder 3FDA Issues Complete Response Letter for RISPERDAL(R) CONSTA(R) for the Adjunctive Maintenance Treatment of Bipolar Disorder 4FDA Issues Complete Response Letter for RISPERDAL(R) CONSTA(R) for the Adjunctive Maintenance Treatment of Bipolar Disorder 5SciQuest Announces Strategic Alliance with Ceiba Solutions 2SciQuest Announces Strategic Alliance with Ceiba Solutions 3SciQuest Announces Strategic Alliance with Ceiba Solutions 4
Immulon 1 B 1x12 Strip, flat bottom; consistent medium binding affinity for hydrophobic complexes and proteins....
The Holten Horizontal series of laminar airflow work benches offers comfort and ease of use....
...
Small bottle for hybridization 150 x 35mm...
Biology Products: