نتایج جستجو برای: heavy metals concentration
تعداد نتایج: 536742 فیلتر نتایج به سال:
one of the most important issues in groundwater is its contamination by heavy metals. because of chemical stability and poor degradation of heavy metals and their ability to accumulate in living organism’s bodies, they can become toxic. for this, 15 water samples were collected from the groundwater resources of the oshnavieh plain in september 2015 ,with evenly distributed, and then were analyz...
The aim of this research was to determine the concentration of cadmium (Cd) and lead (Pb) in the muscle and liver tissues of rainbow trout (Oncorhynchus mykiss) in Hamedan Province (west of Iran) cold water fish farms, and compare the results with the FAO/WHO guidelines. Heavy metal concentrations were determined from the three randomly selected fish farms by Inductively Coupled Plasma Optical ...
in recent years, heavy metal contamination of rice in different parts of the world has raised concerns about its safety and provoked crisis in it's global production and trade. in iran, also some studies have reported on the heavy metal contamination of native products. however, the concentration of heavy metals in rice grain could be influenced through preparation and cooking. this study aimed...
Copper and hexavalent chromium are heavy metals that are harmful to human health. Natural adsorbent chitosan, due to its considerable properties such as the presence of functional groups of –NH2 and -OH, non-toxicity, low cost, and biocompatibility, has gained much attention in pollutant removal. Therefore, in the present study, adsorption of chromium (VI) and copper (II) ions was conducted in ...
Heavy metals affect the biochemical reactions that take place during anaerobic digestion processes of organic matter. In this review, the different effects observed in anaerobic digestion processes and during the production of biomethane and biohydrogen from several substrates contaminated with and/or inheriting heavy metals from the substrates themselves were discussed. It has been found that ...
Background and Objectives:Anzali Wetland is one of the most important aquatic ecosystems of Iran which is located in south-west of the Caspian sea. This Wetland provides a suitable and non-market price habitat for valuable fish and aquatic animals which have an important role in the life cycle of this ecosystem. This study reports the results of some heavy metals contamination monitoring in sup...
Medicinal plants are sources of different chemical substances with different biological activities in living organism. Some of the chemical compounds socalled “heavy metals”, can be dangerous because they tend to bioaccumulate and transported in all biota via the food chain. The aim of our study was to investigate the concentration of heavy metals in commercially available tea samples purchased...
heavy metals contamination is a major environmental problem which requires immediate human attention. the use of plant species to remove pollutants from soils, generally defined as phytoextraction. in order to evaluate phytoextraction of contaminated soils, a pot experiment conducted using two plants barley, canola three kinds of heavy metals (cd, pb, ni) with 3 levels in a completely randomize...
It is obvious that heavy metals toxicity to humans is as a result of long term or extreme level exposure to pollutants common in the environment including the air, water, food and many consumer products like the cosmetics and toiletries .In this study, we measured the levels of toxic metals in different hair dye products sold at local shops in Baghdad, Iraq. The hair dyes included twelve sample...
background: the concentration of heavy metals in drinking water is very important. objectives: to to evaluate the chemistry of some heavy metals in surface drinking water of dakahlia governorate, egypt. methods: 51 surface drinking water samples were collected from the main surface water stations and compact units in october 2009 and analyzed chemically. 26 water samples were analyzed by atomic...
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