نتایج جستجو برای: nitrate pollution

تعداد نتایج: 101776  

Journal: :Annals OR 2014
R. A. Ranga Prabodanie John F. Raffensperger E. Grant Read Mark W. Milke

Nitrate discharges from diffuse agricultural sources significantly contribute to groundwater and surface water pollution. Tradable permit programs have been proposed as a means of controlling nitrate emissions efficiently, but trading is complicated by the dispersed and delayed effects of the diffuse pollution. Hence, markets in nitrate discharge permits should be carefully designed to account ...

Journal: :Chemosphere 2005
Julio A Camargo Alvaro Alonso Annabella Salamanca

Published data on nitrate (NO3-) toxicity to freshwater and marine animals are reviewed. New data on nitrate toxicity to the freshwater invertebrates Eulimnogammarus toletanus, Echinogammarus echinosetosus and Hydropsyche exocellata are also presented. The main toxic action of nitrate is due to the conversion of oxygen-carrying pigments to forms that are incapable of carrying oxygen. Nitrate to...

2011
Nicole Robinson Richard Brackin Kerry Vinall Fiona Soper Jirko Holst Harshi Gamage Chanyarat Paungfoo-Lonhienne Heinz Rennenberg Prakash Lakshmanan Susanne Schmidt

Modern agriculture is based on the notion that nitrate is the main source of nitrogen (N) for crops, but nitrate is also the most mobile form of N and easily lost from soil. Efficient acquisition of nitrate by crops is therefore a prerequisite for avoiding off-site N pollution. Sugarcane is considered the most suitable tropical crop for biofuel production, but surprisingly high N fertilizer app...

2005
Zhi-Jun Liu George R. Hallberg Dale L. Zimmerman Robert D. Libra

Many studies of ground water pollution in general and nitrate contamination in particular have often relied on a one-time investigation, tracking of individual wells, or aggregate summaries. Studies of changes in spatial distribution of contaminants over time are lacking. This paper presents a method to compare spatial distributions for possible changes over time. The large-scale spatial distri...

Journal: :journal of health sciences and surveillance system 0
mohammad ali baghapour department of environmental health engineering, school of health and nutrition, shiraz university of medical sciences, shiraz, iran nasser talebbeydokhti department of civil engineering, college of engineering, shiraz university, shiraz, ir iran hamidreza tabatabee department of epidemiology, school of health, shiraz university of medical sciences, shiraz, ir iran amir fadaei nobandegani department of environmental health engineering, school of health, shiraz university of medical sciences, shiraz, ir iran

background: groundwater nitrate pollution is an important environmental problem in water resources management. in this regard, specific measures aiming at prevention of water pollution will be helpful to managers and decision-makers. identification of aquifers’ vulnerable areas and determination of groundwater protection zones using most widely used models, such as drastic and cd, are one of th...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی عمران 1391

one of the most commonly used techniques to reduce the corrosion rate of rebar in concrete is addition substances named corrosion inhibitors into the concrete. corrosion inhibitor is chemical compounds that were added to concrete to prevent corrosion of steel in concrete. sodium nitrate is a type of anodic inhibitors that this study investigatesthe effect of this inhibitor on the properties of ...

2014
Cheng-Wei Liu Yu Sung Bo-Ching Chen Hung-Yu Lai

Nitrogen is an essential element for plant growth and development; however, due to environmental pollution, high nitrate concentrations accumulate in the edible parts of these leafy vegetables, particularly if excessive nitrogen fertilizer has been applied. Consuming these crops can harm human health; thus, developing a suitable strategy for the agricultural application of nitrogen fertilizer i...

Journal: :Journal of environmental radioactivity 2010
Henrieta Dulaiova Richard Camilli Paul B Henderson Matthew A Charette

We constructed a survey system of radon/methane/nitrate/salinity to find sites of submarine groundwater discharge (SGD) and groundwater nitrate input. We deployed the system in Waquoit Bay and Boston Harbor, MA where we derived SGD rates using a mass balance of radon with methane serving as a fine resolution qualitative indicator of groundwater. In Waquoit Bay we identified several locations of...

Journal: :The Science of the total environment 2013
Mercè Boy-Roura Anna Menció Josep Mas-Pla

Non-point agricultural pollution is a major concern in groundwater management. To investigate nitrate input to the subsurface through groundwater recharge, thirteen natural springs were sampled. Discharge, electrical conductivity (EC), nitrate concentration, pH value and water temperature were monitored every two weeks from January 2010 till February 2011 at selected springs in the Osona region...

2002
Kaplan Yalcin Cameron P. Wake

Trends in the annual flux of sulfate and nitrate in a new ice core collected at an elevation of 3017 m on Eclipse Icefield, 45 km northeast of Mt. Logan were examined to determine the effect of anthropogenic activity on precipitation chemistry in the remote northwest North American midtroposphere. The annual flux of both sulfate and nitrate at Eclipse began increasing in the 1940s, demonstratin...

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