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:11/21/2014)... , Nov. 20, 2014 Strict laws against ... are piloting the North American and European automotive sector ... growing, gesture recognition systems that are intuitive and able ... in the industry. New analysis from ... Recognition Market in Europe and ...
(Date:11/18/2014)... 17, 2014 The Parenteral Drug Association (PDA) today ... will speak and at least seven more will participate in ... Omni Shoreham Hotel in Washington D.C. , ... have significant support from the regulatory agencies in ... in our effort to help advance the use of ...
(Date:11/10/2014)... began appearing on U.S. store shelves in early 2010, ... since. The small packets can be tossed into a ... liquid or powder. The convenience, though, has come with ... researchers at Nationwide Children,s Hospital found that from 2012 ... 17,230 children younger than 6 years of age swallowing, ...
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 4FDA's Janet Woodcock, EMA's Emer Cooke Headline PDA Quality Metrics Conference 2Study finds laundry detergent pods, serious poisoning risk for children 2
(Date:11/21/2014)... Why did Stephen Hawking become so famous? ... recognizable? Why have they become icons to rival film ... Ratcliffe seeks out the answers to those questions, and ... with science. In " Stephen Hawking Smoked My Socks ... Ratcliffe puts it plainly: , “It is profoundly ...
(Date:11/21/2014)... 21, 2014 2014 Deep Research ... and in-depth research report on the transformer market. ... classification, application, and industry chain structure as well ... market analysis, including China’s domestic market as well ... economic situation analysis. The report also covers information ...
(Date:11/21/2014)... - Aequus Pharmaceuticals Inc. (the "Company" or "Aequus") ... a brokered private placement offering (the "Brokered Offering") ... Securities Inc. and Clarus Securities Inc. acted as ... syndicate of agents that also included Wolverton Securities ... Concurrently with the Brokered Offering, the Company also ...
(Date:11/21/2014)... Inc. (TSXV: BRM) ("Biorem" or "the Company") today announced results for ... Biorem,s complete 2014 third quarter financial statements and MD&A have been ... September 30, , Nine-months ended September 30, ... , 2013 , 2014 , ... 6,715 , 14,476 Gross profit , 521 ...
Breaking Biology Technology:“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 2“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 3“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 4International Transformer Industry - Analysis on Applications, Development & Forecasts Now Available at ReportsnReports.com 2International Transformer Industry - Analysis on Applications, Development & Forecasts Now Available at ReportsnReports.com 3Aequus Pharmaceuticals closes $4.2 million private placement financing 2Aequus Pharmaceuticals closes $4.2 million private placement financing 3Biorem Reports Third Quarter Results 2Biorem Reports Third Quarter Results 3
Cached News: