نتایج جستجو برای: changes in concentration of heavy metals extractable through 4n nitric acid
تعداد نتایج: 24548005 فیلتر نتایج به سال:
Background and purpose: The pollution of aquatic ecosystems with heavy metals, have always been a major concern for aquatic organisms and human health. Contaminants such as heavy metals are accumulated along the food chain and then transmitted to human body. Levels of contaminants in fish are of particular interest because of the potential risk to humans. This study examined the levels of cadmi...
introduction: recent investigations have detected the presence of significant levels of heavy metals (chromium, lead and cadmium) in toys and other pvc products manufactured for children. in some countries, addition of compounds containing toxic metals to toys are limited or prohibited. methods: to evaluate the safety of some of the plastic toys in the city of isfahan with respect to toxic trac...
this research was conducted to examine the effect of a concurrent training on rest level of leptin of plasma and some hormonal factors in non-athlete subjects. the research population included non-athlete men who didn’t participate in any organized sport activities. 30 men were chosen voluntarily among the above-mentioned population and were divided into 2 groups: experimental (15 subjects) an...
today the image of a permanent skeletal space of cities affected by some forces or mechanisms is put in time with social-economic development and while imposes a new face and perspective to physical anatomy of cities, and prepares field to changes in content and social- economic structures of cities too. simultaneously with quitting villages in order to settle in cities by villagers, the phen...
treatment of soils contaminated with heavy metals using plant species is a method which has been widely used in thepast. this method, which is known as phytoremediation, has been applied for pollution treatment using different plantspecies worldwide. the method has been used for remediation of various types of pollutants in laboratory, pilot andindustrial scales. the aim of this study was to co...
background: this study was conducted to estimate the level of heavy metals accumulate in vegetables irrigated with contaminated water compared with those irrigated with fresh water in hamadan, west of iran in 2012. methods: sixty samples of different vegetables i.e., parsley, tarragon, sweat basil and leek irrigated with contaminated water and thirty six samples from three different adjacent ar...
Background and purpose: Fish Consumption Guidelines have been established by some countries to guard the public from the potentially harmful health effects related to eating contaminated fish. Guidelines are according to estimations of the health risks linked to concentrations of contaminating chemicals found in fish, and the mean levels of consumption of fish in general population. Fish is an ...
Background and Aim: Heavy metals such as lead and cadmium are toxic and carcinogenic compounds that are absorbed through the skin. Therefore, the aim of this study was to determine the amount of lead and cadmium heavy metals in bulk branded cosmetic bags (mascara and tattoo) distributed in Birjand. Materials and Methods: In this descriptive-analytical study, by referring to the Birjand cosmeti...
background: sediments in marine environment have a large capacity in binding with heavy metals; therefore, they are potential pollutants of water resources. the anzali wetland, located in the southern region of the caspian sea, iran, has been consistently threatened by heavy metal pollutants because of urban, agricultural and industrial wastewater inflow. the purpose of this study is to investi...
introduction: heavy metals are types of elements naturally present in soil or enter into soil as a result of human activities. the most important route of exposure to heavy metals is daily intake of food. crops grown in contaminated soil (due to mining activities, industrial operations and agriculture) may contain high concentrations of heavy metals. also closeness to cities and industrial cent...
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