HOME >> BIOLOGY >> NEWS
Disturbing former farmlands can rouse old pesticides, says Dartmouth research

A group of Dartmouth researchers has evidence that disturbing the land where farms once thrived can mobilize both arsenic and lead that were applied as pesticides in the early 1900s. Once disturbed, these metals can then contaminate nearby surface waters.

"We continue to learn more about how past agricultural practices are affecting our current environment," says Carl Renshaw, Associate Professor of Earth Sciences at Dartmouth. "Unlike some of the pesticides used today, metals like arsenic and lead in old pesticides do not degrade over time. So the question becomes, where do they end up? As we learn more about what happens to these metals since they were applied, we can make better decisions about how to use our land."

Renshaw and his colleagues studied two New Hampshire apple orchards where the pesticide lead arsenate was once used, and they compared the data to a nearby uncontaminated field. Their research was published in the January-February issue of the Journal of Environmental Quality.

The researchers confirmed earlier findings that, in the former orchards, most of the arsenic and lead remains in the top ten inches of soil. The new study goes further and shows that these toxic metals do not remain in their original mineral form. Instead, they are now part of the fine silt and organic matter in the soil, which is most susceptible to erosion.

"We learned that disturbing this land, for example tilling and replanting, mobilizes the arsenic and lead," says Renshaw. "The remobilized metals were found in sediments in a stream channel that drains the tilled orchard."

Renshaw explains that it's unclear whether the metals in the sediment are taken up by plants and animals in the stream. The researchers tested the macroinvertebrate residents (midge flies and dragonflies) at the outlet of the contaminated stream, and found that, as of yet, there is no disparity in the levels of arsenic or lead.

"Historic farmlands in New
'"/>

Contact: Sue Knapp
Sue.Knapp@Dartmouth.edu
603-646-3661
Dartmouth College
17-Feb-2006


Page: 1 2

Related biology news :

1. Alarming decline in Nepals rhinos and tigers in former Maoist stronghold
2. New study to find cause of former Presidents hand disease
3. Dartmouth professor makes case for ethically universal stem cell lines
4. Plants that produce more vitamin C may result from UCLA-Dartmouth discovery
5. Vitamin extends life in yeast, Dartmouth Medical School researchers find
6. Dartmouth researchers find that arsenic triggers unique mechanism in rare leukemia
7. Dartmouth researchers find that low doses of arsenic have broad impact on hormone activity
8. Dartmouth researchers identify a gene that enhances muscle performance
9. Dartmouth study contributes to research addressing malnutrition and iron deficiency
10. Genetic variation impacts aspirins effectiveness in preventing colon cancer, Dartmouth study finds
11. Dartmouth researchers find a neural signature of bilingualism

Post Your Comments:
(Date:7/30/2014)... of the Entomological Society of America (ESA) has elected ... election as a Fellow acknowledges outstanding contributions to entomology ... extension, or administration. The following Fellows will be recognized ... which will be held November 16-19, 2014 in Portland, ... a professor with the Department of Plant, Soil and ...
(Date:7/30/2014)... Laboratory has received a pledge of $1 million from ... the Laboratory,s new Neurobehavioral Biometry Center. , ... will enable the Laboratory to develop a greater breadth ... ultimate goal of accelerating the pace of research to ... as a premier resource for the Laboratory and its ...
(Date:7/30/2014)... a changing climate threaten some of the world,s ... conservationists establish seed collections to save the seeds ... preserving some genetic diversity., For decades, these seed ... offer a one-size-fits-all approach for how many seeds ... samples regardless of species, pollination mode, growth habitat ...
Breaking Biology News(10 mins):Entomological Society of America recognizes 2014 fellows 2Entomological Society of America recognizes 2014 fellows 3Entomological Society of America recognizes 2014 fellows 4Entomological Society of America recognizes 2014 fellows 5Entomological Society of America recognizes 2014 fellows 6Entomological Society of America recognizes 2014 fellows 7Entomological Society of America recognizes 2014 fellows 8Entomological Society of America recognizes 2014 fellows 9Entomological Society of America recognizes 2014 fellows 10Entomological Society of America recognizes 2014 fellows 11Entomological Society of America recognizes 2014 fellows 12Entomological Society of America recognizes 2014 fellows 13Entomological Society of America recognizes 2014 fellows 14Entomological Society of America recognizes 2014 fellows 15Entomological Society of America recognizes 2014 fellows 16Entomological Society of America recognizes 2014 fellows 17Rossi Foundation pledges $1M for JAX neurobehavioral research center 2Saving seeds the right way can save the world's plants 2
(Date:7/31/2014)... Boston, MA (PRWEB) July 31, 2014 ... ) finds itself flush with innovative adult stem cell ... patents and has three additional patent applications ... Office. , The patented inventions address two of the ... and regenerative medicine. Adult stem cells are difficult ...
(Date:7/30/2014)... MD (PRWEB) July 30, 2014 ... today the release of the REVELERIS® Prep ... organic chemists, preparative chromatographers, and other researchers to ... using a single unit. , With the REVELERIS® ... flash and preparative chromatography modes with a simple ...
(Date:7/30/2014)... July 30, 2014  Replikins Ltd. today released new ... Ebola virus. Before the current outbreaks, the mean Ebola ... amino acids) between 1995 and 2002 was 1.1; the ... 2012, and sixteen-fold in 2013, thus predicting the current ... technology has been shown to be able to predict ...
(Date:7/30/2014)... 2014   Wyle has been named ... Mission Support Services (FILMSS) contract awarded by the ... terms of the contract, Wyle will provide mission ... Calif. In particular, Wyle will provide program and ... on the International Space Station and collaborative science ...
Breaking Biology Technology:The Adult Stem Cell Technology Center, LLC Launches A Marketing Campaign To License Adult Stem Cell Biotechnologies 2The Adult Stem Cell Technology Center, LLC Launches A Marketing Campaign To License Adult Stem Cell Biotechnologies 3Grace Launches New REVELERIS® Prep Purification System 2Wyle Wins NASA's Fully Integrated Lifecycle Mission Support Services Contract 2
Cached News: