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:


(Date:4/5/2017)... 5, 2017  The Allen Institute for Cell Science ... a one-of-a-kind portal and dynamic digital window into the ... the first application of deep learning to create predictive ... lines and a growing suite of powerful tools. The ... and future publicly available resources created and shared by ...
(Date:4/5/2017)... -- KEY FINDINGS The global market for ... of 25.76% during the forecast period of 2017-2025. The ... the growth of the stem cell market. ... INSIGHTS The global stem cell market is segmented on ... stem cell market of the product is segmented into ...
(Date:4/3/2017)... April 3, 2017  Data captured by ... platform, detected a statistically significant association between ... to treatment and objective response of cancer ... to predict whether cancer patients will respond ... as well as to improve both pre-infusion potency ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... DuPont Pioneer and recently formed ... entered into a multiyear collaboration to identify and characterize novel CRISPR-Cas nucleases. The ... gene editing across all applications. , Under the terms of the agreement, Pioneer ...
(Date:10/11/2017)... Charlotte, N.C. (PRWEB) , ... October 11, 2017 ... ... ARCS® Foundation President Andi Purple announced Dr. Suneel I. Sheikh, the ... Laboratories ( ASTER Labs ), Inc. has been selected for membership in ...
(Date:10/11/2017)... -- VMS BioMarketing, a leading provider of patient support solutions, has ... (CNE) network, which will launch this week. The VMS CNEs ... professionals to enhance the patient care experience by delivering peer-to-peer ... care professionals to help women who have been diagnosed and ... ...
(Date:10/10/2017)... ... ... San Diego-based team building and cooking events company, Lajollacooks4u, has unveiled a ... new look is part of a transformation to increase awareness, appeal to new markets ... It will also expand its service offering from its signature gourmet cooking classes and ...
Breaking Biology Technology:
Cached News: