Navigation Links
Geoscientists follow arsenic from chicken feed to streambeds

What happened to the chicken when she crossed the road is less important that what happens to what she eats when it is used as fertilizer.

Organic arsenic is fed to poultry to prevent bacterial infections and improve weight gain. A little bit of arsenic is taken up by the tissue and the majority of it is excreted in urine. Poultry litter -- the wood chips, feathers, droppings, and urine from under poultry houses -- is rich in nitrogen and phosphorous, so is a logical fertilizer. But what happens to that arsenic?

Virginia Tech geoscientists are determining what happens to such feed additives when they are part of the manure applied to agricultural fields. They will present their research at the Geological Society of America national meeting in Salt Lake City Oct. 16-19.

In research funded by the U.S. Department of Agriculture, Madeline Schreiber, associate professor of geosciences at Virginia Tech, carried out field and laboratory studies to discover the fate of arsenic fed to poultry. She and her graduate students found that bacteria in the litter and in shallow subsurface soil transform organic arsenic to inorganic arsenic. Organic arsenic is not highly toxic to humans, but inorganic arsenic, with its organic component removed, is toxic.

"We found that organic arsenic is highly soluble in water and is rapidly biotransformed to inorganic arsenic," Schreiber said. Despite laboratory findings that show a strong adsorption of inorganic arsenic to minerals in the soils and aquifer sediments, a surprising finding from water samples from streams receiving runoff is that low concentrations of arsenic are transported to streambeds instead of being retained by the aquifers, Schreiber said. "We think that the arsenic is adsorbed onto nanoscale particles that pass though our filters and through the soil column," said Schreiber. "This suggests that particle transport is an important mechanism in arsenic cycling in these watersheds."

Gradua te student Mary Harvey is currently studying the adsorption potential for organic arsenic to iron oxides and clay minerals. Although much of the organic arsenic is biotransformed to inorganic arsenic before it reaches the aquifer, rapid flushing of organic arsenic in to the subsurface during storm events introduces organic arsenic to the subsurface; thus, understanding its adsorption is important.

Schreiber emphasized, "All of the arsenic concentrations we are finding at our field site are below the drinking water standards, even below the new standards of 10 parts per billion, which will come into effect in February 2006."

Schreiber is now collaborating with microbiologist John Stolz of Duquesne University, and expert on bacteria that transform arsenic. Schreiber and Stolz are looking at bacteria present in the litter and soil and the conditions under which biotransformation occurs.

Schreiber will deliver her paper, "Arsenic cycling in agricultural watersheds: The role of particles," at 3:10 p.m. at the Salt Palace Convention Center, room 250 DE. Harvey will present "Adsorption characteristics of roxarsone, an organoarsenic poultry feed additive," following Schreiber's talk. Co-authors with Harvey are Schreiber and Professor Christopher Tadanier, Research Assistant Professor of Geological Sciences at Virginia Tech.


'"/>

Source:Virginia Tech


Related biology news :

1. Shorter colds, milder flu may follow from newly revealed immune mechanism
2. Study: Paramedics save more lives when they dont follow the rules
3. Evolution follows few of the possible paths to antibiotic resistance
4. Use of amino acid supplement following a heart attack provides no benefit, may be harmful
5. Cell death following blood reflow injury tracked to natural toxin
6. Long-term cancer risk follows stem cell transplant recipients
7. High levels of blindness in southern Sudan following years of war
8. History-hunting geneticists can still follow familiar trail
9. PNAS study reveals why organs fail following massive trauma
10. Imaging techniques permit scientists to follow a day -- or four -- in the life of a cell
11. Palaus coral reefs show differential habitat recovery following the 1998 bleaching event
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/28/2017)... , March 28, 2017 The ... Hardware (Camera, Monitors, Servers, Storage Devices), Software (Video Analytics, ... Region - Global Forecast to 2022", published by MarketsandMarkets, ... 2016 and is projected to reach USD 75.64 Billion ... and 2022. The base year considered for the study ...
(Date:3/24/2017)... 24, 2017 The Controller General of Immigration from ... Abdulla Algeen have received the prestigious international IAIR Award for the ... Continue Reading ... ... Controller Abdulla Algeen (small picture on the right) have received the IAIR ...
(Date:3/23/2017)... The report "Gesture Recognition and Touchless Sensing Market by Technology (Touch-based ... to 2022", published by MarketsandMarkets, the market is expected to be worth USD ... 2022. Continue Reading ... ... ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... and LAGUNA HILLS, Calif. , Oct. ... Cancer Research, London (ICR) and University ... SKY92, SkylineDx,s prognostic tool to risk-stratify patients with multiple myeloma ... MUK nine . The University of Leeds ... partly funded by Myeloma UK, and ICR will perform the ...
(Date:10/10/2017)... ... 2017 , ... San Diego-based team building and cooking events company, Lajollacooks4u, has ... The bold new look is part of a transformation to increase awareness, appeal to ... period. , It will also expand its service offering from its signature gourmet cooking ...
(Date:10/10/2017)... 10, 2017 International research firm Parks Associates announced ... at the TMA 2017 Annual Meeting , October 11 in ... residential home security market and how smart safety and security products impact ... Parks Associates: Smart Home ... "The residential security market has ...
(Date:10/9/2017)... DIEGO , Oct. 9, 2017  BioTech ... biological mechanism by which its ProCell stem cell ... critical limb ischemia.  The Company, demonstrated that treatment ... amount of limbs saved as compared to standard ... the molecule HGF resulted in reduction of therapeutic ...
Breaking Biology Technology: