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:12/11/2014)... DUBLIN , Dec. 09, 2014 Research ... http://photos.prnewswire.com/prnh/20130307/600769 ( http://www.researchandmarkets.com/research/9ql3kr/biometrics_market ) ... Market in India 2015-2019" report to their ... in this market is the adoption of multimodal ... one characteristic of an individual for verification and ...
(Date:12/11/2014)... Minn. , Dec. 10, 2014  Data ... physiologic monitoring, has released a new series of ... of preclinical toxicology researchers. M series, part of ... toxicologists collect the best possible physiologic data when ... Adding functional endpoints to toxicology studies has ...
(Date:12/10/2014)... 2014  Valencell, a leader in performance biometric data ... demand from its licensees for highly accurate, clinically validated ... solely coming from fitness and health sectors, but first ... wearable is only as useful as the biometric data ... driver in long-term mass consumer adoption of wearable products," ...
Breaking Biology News(10 mins):Biometrics Market in India 2015-2019: Key Vendors are 3M Cogent, NEC, Safran and Suprema 2New telemetry implants expected to change how large animal toxicology studies are conducted 2Wearable Technology Products Demand Highly Accurate Biometric Technology 2
... University is subjecting chunks of rock to hellish conditions in ... change. By exposing a handful of rocks ... new data about the large-scale underground storage of carbon dioxide, ... "About 60 percent of the world,s carbon ...
... , DURHAM, N.C. -- Tracking individual cells within the ... Duke University researchers new insights into the causes of ... be treated now by lung transplantation. , IPF fills ... scar tissue, progressively restricting breathing. The Duke University Medical ...
... to information about biodiversity is of crucial importance to ... change research and education. "Non-Commercial" restrictions on the reuse ... these problems, says a review paper published in the ... Halting the loss of biodiversity demands that information on ...
Cached Biology News:AGU meeting: Stanford scientists subject rocks to hellish conditions to combat global warming 2AGU meeting: Stanford scientists subject rocks to hellish conditions to combat global warming 3AGU meeting: Stanford scientists subject rocks to hellish conditions to combat global warming 4New insights come from tracing cells that irreversibly scar lungs 2Creative Commons 'non-commercial' licenses impede the re-use of biodiversity information 2
(Date:12/19/2014)... Dec. 19, 2014  Roche (SIX: RO, ROG; OTCQX: ... Inc. (Bina), a privately held company based in ... Bina provides a big data platform for centralized ... data. Bina,s proprietary on-market Genomic Management Solution, Bina-GMS ... to perform fast and scalable analyses to maximize ...
(Date:12/19/2014)... Springs, FL (PRWEB) December 18, 2014 ... of the nation’s leading specialty pharmacies, has an ... serve as clinical pharmacy consultants for prescriber offices ... therapy expertise. , “We have a variety ... therapies. For example, those specializing in hepatitis C ...
(Date:12/19/2014)... Reports from CDC show approximately ... one or more chronic health conditions - including cardiovascular ... some of these diseases, but may not eliminate the ... While implanted nerve stimulation devices today offer relief, they ... can induce side effects. , To eliminate the ...
(Date:12/19/2014)... (PRWEB) December 18, 2014 With only ... time special on Sartorius Biohit products . The ... mLINE pipettes, Picus Electronic Pipette Trade-in Program, and free ... and Safety officers around the world. They are ideal ... Other features include:, ,     Full volume range ...
Breaking Biology Technology:Roche acquires Bina Technologies and enters the genomic informatics market 2Roche acquires Bina Technologies and enters the genomic informatics market 3BioPlus Specialty Pharmacy Expands ‘Regional Pharmaceutical Care Liaison’ Team 2BioPlus Specialty Pharmacy Expands ‘Regional Pharmaceutical Care Liaison’ Team 3Draper Wins GSK Funding for Smaller, Smarter Implantable Devices 2Major Pipette Distributor Pipette.com Announces Sartorius Year End Specials 2
... locations on an Internet search page: top, middle and down. ... and other times its 100 feet long. Today, e-commerce is ... successful, only then will it will float on the surface ... like a submarine, it will stay caught in some mysterious ...
... Ohio State University's new "living laboratory" of teaching ... developed by Madison-based Sonic Foundry, Inc. , ... presentations, the company announced Monday. , ,The laboratory, ... Ohio State with data for making informed investment ...
... M. Mitchell Waldrop has put his Ph.D. in theoretical physics ... now as a public affairs officer for the National ... science writer in residence for the week, he ... Science's (and Journalism's) Secret Weapon, at which he discussed the ...
Cached Biology Technology:Does your web site have visibility? 2Does your web site have visibility? 3Ohio State's educational tech lab to use Sonic Foundry system 2NSF officer speaks on the future of journalism and science 2NSF officer speaks on the future of journalism and science 3
... programmable system automates the denaturation and hybridization ... walk-away convenience for clinical and research personnel. ... range of sample types, is easy to ... than 50% while ensuring overall precision and ...
... Sample Buffer is a convenient, ... experimental samples and Perfect RNA ... needs no dilution and is ... gels. Simply mix equal volumes ...
... cultured in DMEM and harvested at the log ... the antigens in their native forms, cells were ... on a 12-well (5 mm) adhesive coated slide, ... cellular attachment and to minimize background staining. ...
ID clarifier: Without ethidium bromide...
Biology Products: