HOME >> BIOLOGY >> NEWS
Measuring perchlorate levels in lettuce

A leak from a rocket fuel plant into the groundwater near Henderson, Nev., near Las Vegas, has led to perchlorate contamination in the lower Colorado River. As the river moves from Nevada to Mexico the water is redirected for urban, industrial and agricultural use. Colorado River water is used for both drinking and irrigation throughout the region.

A concern that perchlorate would make its way into the human food chain through vegetables such as broccoli, cauliflower and lettuce has been the stimulus for research by University of Arizona Research Scientist Charles Sanchez, director of the Yuma Agricultural Center, part of the College of Agriculture and Life Sciences at the University of Arizona in Tucson.

Perchlorate is one of the main ingredients of solid rocket propellant. Improper disposal of perchlorate-containing chemicals may result in contaminated soil and water. Because it can affect humans by inhibiting the thyroid's uptake of iodine, Sanchez has been evaluating the extent to which perchlorate is found in desert food crops irrigated with Colorado River water. Perchlorate levels in water have been as high as 14 parts per billion, detected at Lake Mead, the reservoir behind Hoover Dam.

"What I measure in water at the Imperial Diversion Dam near Yuma ranges from two to seven parts per billion," Sanchez says. The lower concentrations may be due to biological factors, such as uptake by aquatic and riparian plant species along the river, and perhaps microbial reduction. It appears that microbial organisms capable of reducing perchlorate to chloride are fairly widespread, however conditions that favor this reaction rarely exist in nature.

A preliminary survey conducted in 2002-2003 generally found perchlorate concentrations near or below detection for most vegetable crop species sampled, including most vegetables eaten as roots and fruits. The exception was leafy vegetables, such as lettuce, where the foliage is consumed. However, f
'"/>

Contact: Charles Sanchez
sanchez@ag.arizona.edu
928-782-3836
University of Arizona
29-Jan-2004


Page: 1 2 3

Related biology news :

1. Measuring artificial viruses to improve disease detection
2. Measuring blood sugar with a wave of the arm
3. Measuring the muscle: new study by Scripps researchers depicts how the tunas body is built for speed
4. Measuring alcohol levels in breath, blood and now the brain
5. Echocardiography Is Effective In Measuring Microvascular Damage From Heart Attacks
6. Microsurgery Made More Accurate With Virtual Measuring Tool
7. Blue marlin in gulf have high mercury levels, A&M study shows
8. Flame retardant levels much higher in farmed salmon
9. Excess levels of nitrogen, phosphorus linked to deformed frogs
10. Maternal DHA levels plays important role in infant development
11. Moderate alcohol consumption increases plasma levels of a protective hormone

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Measuring perchlorate levels lettuce

(Date:11/21/2014)... 20, 2014 Strict laws against distracted driving ... the North American and European automotive sector towards gesture ... recognition systems that are intuitive and able to retrieve ... industry. New analysis from Frost & ... in Europe and ...
(Date:11/18/2014)... WASHINGTON , Nov. 18, 2014  The ... Security Industry Association today jointly announce the formation ... and release of its Identity and Biometric ... (Framework). The Framework received official support from BORDERPOL, ... governments to improve and provide expertise regarding border ...
(Date:11/18/2014)... NEW YORK , Nov. 18, 2014 /PRNewswire/ ... iris-based identity authentication solutions, and MorphoTrust USA ... solutions and services, today announced a strategic partnership ... across enterprise, motor vehicle administration (MVA), airport screening ... leader in identity-related solutions, MorphoTrust serves consumers through ...
Breaking Biology News(10 mins):Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 2Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 3Gesture Recognition Intensifies with the Rise of In-car Smartphone Integration, Says Frost & Sullivan 4Identity Management, Document Authentication and Biometric Companies Form "The Airport Entry and Exit Working Group", Releasing the Framework to Help Guide the Department of Homeland Security and Congress Towards Solutions 2Identity Management, Document Authentication and Biometric Companies Form "The Airport Entry and Exit Working Group", Releasing the Framework to Help Guide the Department of Homeland Security and Congress Towards Solutions 3EyeLock, MorphoTrust Form Strategic Partnership to Pursue Commercial Enterprise Deployments 2EyeLock, MorphoTrust Form Strategic Partnership to Pursue Commercial Enterprise Deployments 3
(Date:11/22/2014)... On November 17th Chicago start-up Briteseed outperformed 137 ... Summit in San Francisco to take first place in ... Valley investors and technology elites as the premier showcase ... Briteseed to move on to the final phase ... with other elite innovation finalists for a $125,000 cash ...
(Date:11/22/2014)... 2014  The element of surprise has been a ... strike without warning. Until now, epidemiologists had nothing to ... outbreak, resulting in suboptimal responses to both the H1N1 ... Photo - http://photos.prnewswire.com/prnh/20141121/160242 ... because virus gene structural changes have been found that ...
(Date:11/21/2014)... , Nov. 21, 2014   TRU-D SmartUVC LLC ... their superbug-killing UVC automated disinfection robot, TRU-D SmartUVC, at FIS ... from Nov. 23 to 26 at Stand 23. ... United Kingdom,s largest infection-related event of ... societies to one of the leading events of its type ...
(Date:11/21/2014)... 20, 2014 Author Matthew J. Pallamary’s ... the Other Side” published as a tribute to ... the “Fiction: Short Story” category of the 2014 ... and CEO of USA Book News, said this year’s ... publishers, including Simon & Schuster, Penguin, John Wiley & ...
Breaking Biology Technology:Insight Product Development Accelerator Member Wins MedTech Innovator Award Competition 2Insight Product Development Accelerator Member Wins MedTech Innovator Award Competition 3Viruses' Advantage of Surprise is Lost 2TRU-D SmartUVC to Showcase Superbug-Killing Robot at FIS 2014 2TRU-D SmartUVC to Showcase Superbug-Killing Robot at FIS 2014 3Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 2Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 3Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 4
Cached News: