نتایج جستجو برای: aggregate particulate organic matter among other fractions
تعداد نتایج: 3055996 فیلتر نتایج به سال:
introduction soil infiltration rate is the major soil hydraulic property which can be affected by the soil physical characteristics and management practices. the use of land can affect various soil properties such as physical and hydraulic properties. differences of the hydraulic soil characteristics such as infiltration rate in various land uses can affect their potential to runoff production ...
Short-term chronic and acute aquatic bioassays are valuable tools in screening a variety of environmental samples. However, only a limited number of studies have used these methods for testing the toxicity of atmospheric particulate matter samples. Previous studies have shown that compounds known to have adverse biological effects, such as polycyclic aromatic hydrocarbons, are deposited in sign...
BACKGROUND Birth cohort studies provide the opportunity to advance understanding of the impact of environmental factors on childhood health and development through prospective collection of environmental samples. METHODS We evaluated the feasibility and informative value of the environmental sample collection methodology in the initial pilot phase of the National Children's Study, a planned U...
BACKGROUND Studies have shown associations between mortality and long-term exposure to particulate matter air pollution. Few cohort studies have estimated the effects of the elemental composition of particulate matter on mortality. OBJECTIVES Our aim was to study the association between natural-cause mortality and long-term exposure to elemental components of particulate matter. METHODS Mor...
Introduction The use of fossil fuels as an energy source results in the emission of a complex mixture of gases, aerosols and particulate matter to the atmosphere. Legislation to limit these emissions has been implemented both on land and at sea in order to safeguard human health and the environment. However, such legislation began to be implemented earlier for land-based emissions than for emis...
Air pollution exposure causes seven million deaths per year, according to the World Health Organization. Possessing knowledge of air quality and sources of air pollution is crucial for managing air pollution and providing early warning so that a swift counteractive response can be carried out. An optical prototype sensor (AtmOptic) capable of scattering and absorbance measurements has been deve...
Control of fossil-fuel particulate black carbon and organic matter, possibly the most effective method of slowing global warming'' by M.
Long-term incorporation of manure has shown many benefits to improve soil productivity, but its effects on nitrogen (N) partitioning in aggregates and availability plants is not well understood. The aim this study was examine the influence different long-term field fertilization regimes N aggregates. Soils from a after 25-yr treatments no (CK), mineral fertilizer (NPK), NPK with stover return (...
The downward flux of sinking particles is a prominent Hg removal and redistribution process in the ocean; however, it not well-constrained. Using data from three U.S. GEOTRACES cruises including Pacific, Atlantic, Arctic Oceans, we examined mercury partitioning coefficient, K d , water column. suggest that varies widely over ocean basins. We also investigated effect particle concentration compo...
Airborne particulate matter along with volatile organic compounds, heavy metals, and other compounds have raised many concerns to many countries including Iran. In this study, the concentrations of seven heavy metals (Cd, Cr, Co, Ni, Pb, Zn, and Al) associated with PM10 have been investigated during normal and dusty days from September to February 2012. The mean PM10 concentrations on the norma...
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