نتایج جستجو برای: present survey studies intensity of heavy metals pollution ca
تعداد نتایج: 21323378 فیلتر نتایج به سال:
Background and Objective: Street dust is considered as one of the important sources of particulate matters and heavy metals in the atmosphere. The goal of this study was to assess the heavy metals pollution in street dust of Tehran and evaluate their ecological risk. Materials and Methods: The sampling of street dust was carried out in two areas at the east and west of Tehran. After preparatio...
conclusions it can be concluded that residential-road land uses show the considerable pollution index and ecological risk. materials and methods soil samples were collected from a depth of 0-20 cm at 16 stations with different users. the samples were passed through a 2-mm sieve after air drying. to determine the concentration of heavy metals, the samples were extracted by acid chloride and nitr...
a study was carried out in malawi to determine the levels of heavy metals in cabbages grown in gardens irrigated with reservoir and tap water. the concentrations of cadmium, lead and chromium were determined in the leaf and in the corresponding soils in order to assess whether the amounts in the soils reflected the accumulation of heavy metals in plants. the results showed that the levels of th...
sediment core samples can provide useful information about aquatic environment. sedimentation rate, climate changes and heavy metal concentration are among the most important studies that are carried out on sediment cores. in this study, a sediment core of 70cm with aim of metal concentration investigation is collected from central part of the zarivar lake in the vicinity of the marivan city in...
Background & Aims of the Study: Heavy metals pollution in aquatic ecosystems threats living organisms' health and environment. Hence, the present study aims to assess concentration of lead, chromium, copper, zinc and their ecological risk in the surface sediments of the Bashar River during the summer and winter seasons. Materials & Methods: This is a field study; sampling of...
Contamination of soil with heavy metals has detrimental effects on ecosystems, because heavy metals accumulated in soil may persist and affect terrestrial ecosystems for a long time. Phytoremediation, as sustainable, low-cost and environmental friendly technology based on the direct use of plants for in situ remediation of contaminated soil, sludges, sediments, and ground water through contamin...
Accumulation of trace metals in sediment can cause severe ecological impacts. The present study determines the elemental concentrations and chemical partitioning of heavy metals in surface sediment of Shadegan wetland. Shadegan wetland is one of the most important wetlands in southwest of Iran and it is in Ramsar-listed wetlands. For this purpose, 7 sampling stations were selected for sediment ...
Background and purpose: Heavy metals in urban air are major health threats and increase the risk of respiratory, cardiovascular, and cancers in humans. An efficient and low-cost method for monitoring these pollutants is using tree bark as a bioindicator. The purpose of this study was to measure the concentration of heavy metals by pine tree bark as a bioindicator in Neishabur, north-east of Ira...
bioaccumulation of heavy metals in the skulls of black-striped field mice (apodemusagrarius) was compared for two localities in serbia differing in the level of pollution. eight heavy metals: fe, mn, co, cd, zn, ni, pb and cu, were quantitatively analyzed by atomic absorption spectrophotometry.four of them (mn, cd, fe and ni) showed significantly higher concentrations at the polluted location t...
abstract this study investigated the predictability of variables from a motivational framework as well as individuals qualities to predict three non-linguistic outcomes of language learning. gardners socio-educational model with its measures has been used in the current study. individual qualities presented in this study include (1) age, (2) gender, and (3) language learning experience. the...
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