Navigation Links
Chloride found at levels that can harm aquatic life in urban streams of the Northern US
Date:9/16/2009

streams in agricultural areas had chloride levels that exceeded the recommended federal criteria set to protect aquatic life (compared to more than 40 percent of urban streams). Overall, 15 percent of all streams had chloride levels exceeding the criteria.

Chloride concentrations in shallow groundwater (not used for drinking) were 16 times greater in urban areas than in forests, and 4 times greater in urban areas than in agricultural areas.

Highest levels in streams in the winter

In urban streams, the highest levels of chloride (as great as 4,000 parts per million, which is about 20 times higher than the recommended federal criteria) were measured during winter months when salt and other chemicals are used for deicing.

Increases over time

Increases in chloride levels in streams during the last two decades are consistent with overall increases in salt use in the U.S. for deicing.

Increasing chloride yields are linked to the expansion of road networks and parking lots that require deicing, increases in the number of septic systems, increases in wastewater discharge, and increases in saline groundwater from landfills.

Sources can vary locally

Chloride in ground and surface waters comes from many sources including the use and storage of salt for deicing roads, septic systems, wastewater treatment facilities, water softening, animal waste, fertilizers, discharge from landfills, natural sources of salt and brine in geologic deposits, and from natural and human sources in precipitation.


'/>"/>

Contact: John Mullaney
jmullane@usgs.gov
860-291-6760
United States Geological Survey
Source:Eurekalert

Page: 1 2

Related biology news :

1. Exotic timber plantations found to use more than twice the water of native forests
2. Anticancer compound found in American mayapple
3. Shifting baselines confound river restoration
4. NTU and Temasek Foundation transfer technology knowhow to Chinas quake-prone regions
5. Newly found DNA catalysts cleave DNA with water molecule
6. Essential nutrient found in eggs may help lower risk of neural tube defects
7. Little-known protein found to be key player
8. 121 breeding tigers estimated to be found in Nepal
9. Possible drug target found for one of the most aggressive breast cancers
10. Will IVF work for a particular patient? The answer may be found in her blood
11. UTSA wins San Antonio Area Foundation grant to further chlamydia research
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/2/2014)... regulations over the last decade in Taiyuan, China, have ... for a greater than 50% reduction in costs associated ... 2010, according to researchers at the Columbia Center for ... Public Health, the Shanxi Medical University, the Center of ... Fudan University School of Public Health. , The study ...
(Date:9/2/2014)... take stress in stride; others are done in by ... molecular mechanisms of this so-called stress gap in mice ... could lead researchers to better understand the development of ... people, each animal has unique experiences as it goes ... experiences can alter the expression of genes, and as ...
(Date:9/1/2014)... Conventional wisdom has long held that corals ... reefs are passive organisms that rely entirely ... as nutrients and oxygen. But now scientists at ... in Israel have found that they are far ... into turbulent patterns that greatly enhance their ability ...
Breaking Biology News(10 mins):Clean air halves health costs in Chinese city 2Discovery hints at why stress is more devastating for some 2Discovery hints at why stress is more devastating for some 3Nature's tiny engineers 2Nature's tiny engineers 3
... at the U.S. Department of Energy,s (DOE) Brookhaven National Laboratory ... of carbon can be used to image aromatase, an enzyme ... The research, published in the November issue of Synapse ... aromatase is concentrated may be unique to humans. "The ...
... crisis in a similar way to plants and the human ... to predict future financial down-turns. An extensive analysis of ... similar symptoms, whether they be polluted forests, cancer patients or ... the way that humans, animals and plants adapt to harsh ...
... now dominate the field of veterinary medicine the result ... itself in the fields of medicine and law. That,s ... that appear to be driving the change: the 1972 federal ... graduate schools who may be deterred by a growing number ...
Cached Biology News:PET scans reveal estrogen-producing hotspots in human brain 2Plants and animals under stress may provide the key to better stock market predictions 2Vet med's big shift to more women, fewer men driven by falling barriers, more female grads 2Vet med's big shift to more women, fewer men driven by falling barriers, more female grads 3Vet med's big shift to more women, fewer men driven by falling barriers, more female grads 4
(Date:9/1/2014)... YORK , Sept. 1, 2014 ... is available in its catalogue: India ... 2019 http://www.reportlinker.com/p02350445/India-Solid-Waste-Management-Vehicles-Market-Forecast-and-Opportunities-2019.html ... corporations are the main governing bodies responsible for ... in cities. On an average, around 135,000 MT ...
(Date:8/31/2014)... September 01, 2014 Available spectra ... needs for research and cultivation of a wide ... Valoya’s proprietary LEDs with proven patented and pending ... uncompromised light uniformity in critical applications in contrast ... LEDs. , “Our customers have a large variety ...
(Date:8/29/2014)... DIEGO, Aug. 29, 2014  Pfenex Inc. (NYSE ... the development of high-value and difficult to manufacture ... update and reported financial results for the second ... the successful completion of our initial public offering, ... our biosimilar product candidates, derived from our proprietary ...
(Date:8/29/2014)... Pittcon is pleased to announce that the 2015 ... Scientific, have organized a session on nanotechnology for presentation ... Asia’s largest analytical and scientific instruments show, will be ... , The four speakers in this U.S. symposium, “Thinking ... Single Cells” will present their use of nanotechnology to ...
Breaking Biology Technology:India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 2India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 3India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 4India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 5India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 6India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 7India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 8Pfenex Reports Second Quarter 2014 Results and Provides Business Update 2Pfenex Reports Second Quarter 2014 Results and Provides Business Update 3Pfenex Reports Second Quarter 2014 Results and Provides Business Update 4Pfenex Reports Second Quarter 2014 Results and Provides Business Update 5Pfenex Reports Second Quarter 2014 Results and Provides Business Update 6Pfenex Reports Second Quarter 2014 Results and Provides Business Update 7Pfenex Reports Second Quarter 2014 Results and Provides Business Update 8Fifth Annual U.S. Symposium at JASIS Organized by Pittcon’s Program Chairman Hub MacDonald 2
... Multiporator , , , , , , , ... Protocol No. 4308 915.040 11/2000 , , , , ... , Cell line , U-266, human myeloma, ... Plasmid pEGFP-C1 (in bidistilled H 2 O), , ...
... , , , , , , ... , , , , , , , ... Cell line , T98G, human glioblastoma, , ... (in bidistilled H 2 O), , , ...
... , , , , , , , Multiporator / Electroporator 2510 , ... , Transformation Protocol , Protocol ... , , , , , ... , , Cell type , ...
Cached Biology Technology:U-266 2T98G 2Staphylococcus epidermidis 2
... EKMax™ is a recombinant preparation of ... EKMax™ Enterokinase is expressed and isolated from ... highly purified enzyme preparation (2). It recognizes ... bond after the lysine residue. The enzyme ...
... are cytopathic effect inhibition assays, also known as ... tissue culture supernatents; serum from PK studies and ... is defined as the quantity of interferon required ... viral infection by 50%. All standards ...
...
...
Biology Products: