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:7/31/2014)... the National Science Foundation (NSF), counters a widely-held ... warming, indicating instead that certain Arctic lakes store ... atmosphere. , The study, published this week ... thermokarst lakes, which occur as permafrost thaws and ... water, converting what was previously frozen land into ...
(Date:7/31/2014)... that biomass burning burning forests to create ... slash-and-burn agriculture and wildfires figures into both ... the release of a new study by Stanford ... Jacobson, the degree of that contribution had never ... a paper published July 30 in the ...
(Date:7/31/2014)... hidden hazard lurks beneath many of the roughly ... The hazard is corrosion in parts of underground ... leaks and contamination of groundwater, a source of ... nine states have reported many rapidly corroding gas ... incidents are generally associated with use of gasoline-ethanol ...
Breaking Biology News(10 mins):Certain Arctic lakes store more greenhouse gases than they release 2Stanford professor finds that wildfires and other burns play bigger role in climate change 2Stanford professor finds that wildfires and other burns play bigger role in climate change 3Stanford professor finds that wildfires and other burns play bigger role in climate change 4NIST corrosion lab tests suggest need for underground gas tank retrofits 2
(Date:8/1/2014)... 2014 One of the major revolutions taking ... which is the practice of using genomic and other ... individual biology. Personalized diagnostics—laboratory analyses that inform the practice ... lab,s future. This fall, AACC ,s first ever ... in this exciting field and the novel technologies driving ...
(Date:8/1/2014)... August 1, 2014 According to ... "Biophotonics Market - Global Industry Analysis, Size, Share, Growth, ... valued at USD 25.16 billion in 2013, which is ... at a CAGR of 10.4% from 2014 to 2020. ... http://www.transparencymarketresearch.com/biophotonics-market.html Increasing demand for accurate early ...
(Date:8/1/2014)... Canada (PRWEB) August 01, 2014 Once ... should it cost? This webinar will discuss how to ... , Join speakers Bob Allen, Senior Director of ... of Process Engineering at Fluor Industrial Services, and special ... Manufacturing Asset Planning at Amgen, as they provide an ...
(Date:8/1/2014)... -- Cambrex Corporation (NYSE: CBM ) reports results ... Highlights , Second quarter sales increased 59% ... last year. , Second quarter EBITDA increased 86% to ... last year (see table at the end of this release). ... impact of foreign currency, to between 13% and 16% over ...
Breaking Biology Technology:First-Ever AACC Virtual Conference to Focus on Personalized Diagnostics 2Global Biophotonics Market is Expected to Reach USD 50.20 Billion in 2020: Transparency Market Research 2Global Biophotonics Market is Expected to Reach USD 50.20 Billion in 2020: Transparency Market Research 3Global Biophotonics Market is Expected to Reach USD 50.20 Billion in 2020: Transparency Market Research 4Defining Low Cost in Your Solution for Future Facilities, New Webinar for Pharma, Biotech, Medical Device and Healthcare Companies, Hosted by Xtalks 2Cambrex Reports Second Quarter 2014 Financial Results 2Cambrex Reports Second Quarter 2014 Financial Results 3Cambrex Reports Second Quarter 2014 Financial Results 4Cambrex Reports Second Quarter 2014 Financial Results 5Cambrex Reports Second Quarter 2014 Financial Results 6Cambrex Reports Second Quarter 2014 Financial Results 7Cambrex Reports Second Quarter 2014 Financial Results 8Cambrex Reports Second Quarter 2014 Financial Results 9Cambrex Reports Second Quarter 2014 Financial Results 10Cambrex Reports Second Quarter 2014 Financial Results 11Cambrex Reports Second Quarter 2014 Financial Results 12Cambrex Reports Second Quarter 2014 Financial Results 13Cambrex Reports Second Quarter 2014 Financial Results 14Cambrex Reports Second Quarter 2014 Financial Results 15Cambrex Reports Second Quarter 2014 Financial Results 16
Cached News: