نتایج جستجو برای: heavy elements
تعداد نتایج: 395349 فیلتر نتایج به سال:
Maharlou Lake, as the largest water body neighboring to the metropolis of Shiraz, plays a significant role in adjusting the ecosystem of the region. The objective of this study was to evaluate mineralogy and heavy metals enrichment in the surface sediments of the Maharlou Lake. The result showed a decreasing trend of heavy metals concentrations in studied region surface sediments as follows: Sr...
Background and Aims: The environmental pollution induces rapid development of new technologies cases problems such as pollution of soil, water and air. Heavy metals contaminated can disturb Biodiversity soil. Phytoremediation is one of them new techniques in cleared of heavy metals in soil. A Phytoremediation method enables leaving a contaminated soil from the elements with accumulation of heav...
1. Basic Concepts 1.1. Air Pollution 1.2. Criteria and Non-Criteria 1.3. Emissions 2. The Epidemiological Model 3. Toxic Trace Elements from Fossil Fuel Combustion 4. Environmental Behavior of Metal Pollutants 4.1. Atmospheric Aerosol Particles 4.2. Aqueous and Marine Environments 4.3. Accumulation of Heavy Metals in Marine Invertebrates 4.4. Heavy Metal ions in Soils 4.5. Methylation of Heavy ...
this study aims to measure the amount of heavy metal lead in the effluent haft tapeh and compare it with dez river in winter 2010 and spring 2011. first nine water samples using a rope marked at the desired depth within the sampling depth of effluent technology cultured in three stations in haft tapaeh. hence measuring the concentration of heavy elements using graphite furnace method and atomic...
The current status of lattice calculation of weak matrix elements for heavy quark systems is reviewed. After an assessment of systematic errors in present simulations, results for the B meson decay constant, the B parameter BB and semi-leptonic heavy-to-light and heavy-to-heavy transitions are discussed. The final topic are lattice results for heavy baryon spectroscopy.
This paper attempts to predict heavy metals (Pb, Zn and Cu) in the groundwater from Arak city, using support vector regression model(SVR) by taking major elements (HCO3, SO4) in the groundwater from Arak city. 150 data samples and several models were trained and tested using collected data to determine the optimum model in which each model involved two inputs and three outputs. This SVR model f...
Persistent exposure to high levels of heavy metals and trace elements has been implicated in autism spectrum disorders (ASDs). This study was performed to investigate the levels of heavy metals and trace elements in hair samples of patients with ASDs. Retrospective analysis of data from 58 children with ASDs with the mean age of 6.31+4.12 years between Jan. 2004 and Oct. 2008 was performed at K...
One of the pollutants produced by gas and petrochemical industries in Assaluyeh region is heavy metals which, by entering of these industries into the Persian Gulf, has caused water and aquatic pollution. Therefore, in the present study were investigated the concentration of non-carcinogenic hazard quotient index (NHQI) of heavy metals (Fe, Cr, Pb, Cu, Zn, Cd, Se, Ni) in Persian Gulf waters and...
A variety of elements are present in honey at different concentrations. Although some of these heavy metals and trace elements are useful nutrition, at higher levels they could cause health problems. In order to achieve confidence about food safety, regular monitoring of food quality is necessary. In this study, heavy metals and trace element contents were determined by inductively coupled plas...
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