نتایج جستجو برای: index of geo accumulation igeo

تعداد نتایج: 21200129  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه زنجان - دانشکده ادبیات و علوم انسانی 1392

abstract the present study investigated the effects of task types and involvement load hypothesis on incidental learning of 10 target words (tws) in junior high schools (jhss) in givi, ardabil. the tasks deployed in this study were two input-based tasks (reading plus dictionary use with an involvement index of 3, and reading plus gap-fill task with an involvement index of 2), and one output-ba...

Hoda Karimi, Maryam Mohammadi Roozbahani, Rezvan Sorooshnia, Soheil Sobhan Ardakani,

Background: Soil serves as a major reservoir for contaminants as it can bind to various chemicals. The aim of this study was to evaluate the levels of some metals (Cd, Cu, Fe and V) in soil samples collected from different stations of Ahvaz Industrial Complex II to determine the natural and anthropogenic contribution of metal in the soil. Methods: This was an experimental study that carried ou...

Journal: :iranian journal of public health 0
q cheng w wang h wang w ang z zhao

background: heavy metal pollution in the sediment of the yellow river draws wide attention in the recent years. the yellow river wetland nature reserve of zhengzhou is one of the major wetlands of the river and located at the beginning of the lower reach. in this article, we aimed to investigate the degree and the sources of the metal pollution in the reserve. methods: metals as cu, pb, cr, cd ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1390

any change in the refractive index of a laser active medium can lead to serious degradation of beam quality, laser beam modes, laser performance and variation in the intensity distribution. alteration in the refractive index of laser active medium is especially notable in high power lasers. it is clear that in the laser beam production, the pumping agent induces a great amount of heat which...

Journal: Pollution 2019

The Kolleru Lake is a famous Ramsar wetland of international significance. In this study heavy metal contents in water and sediment samples are reported. It is found that certain potentially toxic metal ions like chromium (4.5-80 µg/L), copper (1-20 µg/L), manganese (1-313 µg/L) and zinc (1.2-57 µg/L) are present in variable quantities in the lake water. When normalized with respect to concentr...

The Kolleru Lake is a famous Ramsar wetland of international significance. In this study heavy metal contents in water and sediment samples are reported. It is found that certain potentially toxic metal ions like chromium (4.5-80 µg/L), copper (1-20 µg/L), manganese (1-313 µg/L) and zinc (1.2-57 µg/L) are present in variable quantities in the lake water. When normalized with respect to concentr...

Journal: :Pollutants 2022

Lake Victoria (L. Victoria) is the largest African tropical and freshwater lake, with one of highest pollution levels, globally. It shared among Uganda, Kenya Tanzania, but it drained only by river Nile, longest in Africa. Though environmental studies have been conducted investigations heavy metals (HMs) contamination sediments from fish landing sites ports on Ugandan portion L. are limited. In...

Journal: :global journal of environmental science and management 2016
gh. a. mohammadpour a.r. karbassi a. baghvand

presence of toxic metals in agricultural soils can impose adverse health impact on consumers. the main purpose of this study was to determine spatial distribution of elements fe, sb, mn in agriculture soils and crops of hamedan province in iran. soil samples (0-20 cm depth) were collected from an area of 2831 km2.  iron, antimony and manganese in samples of soil and agricultural crops were extr...

Journal: :محیط شناسی 0
علیرضا واعظی دانشجوی دکتری مهندسی محیط زیست- منابع آب دانشکدۀ تحصیلات تکمیلی محیط زیست دانشگاه تهران عبدالرضا کرباسی دانشیار مهندسی محیط زیست دانشکدۀ تحصیلات تکمیلی محیط زیست دانشگاه تهران مجتبی فخرایی کارشناس ارشد مهندسی محیط زیست- منابع آب دانشکدۀ تحصیلات تکمیلی محیط زیست دانشگاه تهران علیرضا ولی خانی سامانی کارشناس ارشد مهندسی محیطزیست – منابع آب دانشکده تحصیلات تکمیلی محیط زیست دانشگاه تهران مهدی حیدری کارشناس ارشد مهندسی محیط زیست- منابع آب دانشکدۀ تحصیلات تکمیلی محیط زیست دانشگاه تهران

introduction we can obtain useful information about aquatic systems by studying heavy metals in surface sediments. marine sediments can bring out the aquatic contamination. due to heavy metal toxicity, hard biodegradation and easy bioaccumulation in aquatic ecosystems, various indices have been developed such as sediment quality guidelines (sqgs), enrichment factor (ef), pollution load index (i...

Journal: :HKIE Transactions 2022

Heavy metal contents in road dust have been an important indicator of heavy pollution arising from traffic-related activities. In this study, 108 samples were collected four locations Hong Kong, namely Kwai Hing (industrial area), Sau Mau Ping (residential Sai Kung and Tai Lam (rural over a one-year period analysed for zinc (Zn), nickel (Ni), copper (Cu), lead (Pb), chromium (Cr), cadmium (Cd),...

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