نتایج جستجو برای: pb removal

تعداد نتایج: 176648  

Journal: :journal of nanostructures 2016
m. ebadi h. shagholani h. jahangiri

in current work, cds/black carbon nanocomposites were successfully synthesized with the aid of chestnut and cadmium nitrate as the starting reagents. besides, the effects of preparation parameters such as reaction time, and precursor concentration on the morphology of products and removal of heavy metals (hg+2, pb+2) were studied by scanning electron microscopy images and batch adsorption mode....

Journal: :Toxicological sciences : an official journal of the Society of Toxicology 2008
Larissa Tercilia Grizzo Sandra Cordellini

Perinatal Pb exposure may modulate arterial tone through nitric oxide (NO) and cyclooxygenase products. To investigate this, Wistar dams received 1000 ppm of Pb or sodium acetate (control) in drinking water during pregnancy and lactation. Curves were constructed in phenylephrine-precontracted intact and/or denuded rings of thoracic aortas of weaned (23-day-old) male pups from their responses to...

2011
Tariq Mahmood Ansari Muhammad Asif Hanif Abida Mahmood Uzma Ijaz Muhammad Aslam Khan Raziya Nadeem Muhammad Ali

Rosa centifolia and Rosa gruss an teplitz distillation waste biomass was immobilized using sodium alginate for Pb(II) uptake from aqueous solutions under varied experimental conditions. The maximum Pb(II) adsorption occurred at pH 5. Immobilized rose waste biomasses were modified physically and chemically to enhance Pb(II) removal. The Langmuir sorption isotherm and pseudo-second-order kinetic ...

At this work, removal of Pb (II) using Lawsonia inermis (Henna) was studied. In recent years, use of low price adsorbent is taken into consideration. Adsorption experiments were performed in batch system at ambient temperature (25℃). The influence of some parameters such as time, initial metal concentration, pH and adsorbent dose were investigated. The optimum conditions was obtained at pH of 6...

Journal: :environmental health engineering and management 0
samira namavari department environmental engineering, faculty of natural resources, islamic azad university, bandar abbas branch, bandar abbas, iran farid moeinpour department of chemistry, college of science, bandar abbas branch, islamic azad university, bandar abbas, iran

background: lead (pb) is a heavy metal that is widely utilized in industries. it contaminates soil and groundwater. its non-biodegradability, severe toxicity, carcinogenicity, ability to accumulate in nature and contaminate groundwater and surface water make this toxic heavy metal extremely dangerous to living beings and the environment. therefore, technical and economic methods of removing pb ...

2002
STEVEN G. BUCKLEY ROBERT F. SAWYER CATHERINE P. KOSHLAND DONALD LUCAS

We describe several laser fluorescence methods used to measure lead in flames and in post-flame gases. Each relies on excitation of the 7s P1 4 6p 2 3P0 transition from the ground state of lead and detection of fluorescence on the 7s P1 3 6p 2 P1 and 7s P1 3 6p 2 P2 transitions. Aqueous solutions of lead salts are atomized and injected into a lean flatflame. Dye laser excitation is used to dete...

Journal: :Clinical cancer research : an official journal of the American Association for Cancer Research 1998
Y Huang S Waxman

The effect of phenylbutyrate (PB), a nontoxic differentiation inducer, in human colon carcinoma cell lines treated with 5-fluorodeoxyuridine (FUdR) was evaluated. Two HT-29 human colon carcinoma subclones (U4 well differentiated and U9 poorly differentiated) were equally growth inhibited by 16 h of FUdR (0.2 microM) treatment but recovered cell growth in 3-6 days after the removal of FUdR. PB a...

2013
Siang Yee Yeo Siwon Choi Vivian Dien Yoke Keow Sow-Peh Genggeng Qi T. Alan Hatton Patrick S. Doyle Beng Joo Reginald Thio

We report the use of a simple yet highly effective magnetite-waste tea composite to remove lead(II) (Pb(2+)) ions from water. Magnetite-waste tea composites were dispersed in four different types of water-deionized (DI), artificial rainwater, artificial groundwater and artificial freshwater-that mimic actual environmental conditions. The water samples had varying initial concentrations (0.16-5....

Journal: :محیط زیست طبیعی 0
نبی ا... منصوری دانشیار گروه مهندسی محیط زیست، دانشکدۀ محیط زیست و انرژی، واحد علوم و تحقیقات دانشگاه آزاد اسلامی فرهاد نژادکورکی استادیار گروه محیط زیست، دانشکدۀ منابع طبیعی و کویر شناسی، دانشگاه یزد نرجس السادات موسویان ندوشن دانشجوی دکتری علوم محیط زیست، یزد

industrial processes release a range of gaseous and particulate pollutants containing heavy metals into the air. lack of enough attention to the design, installation, repair and maintenance of gas and dust filtration systems in industries, is one of reasons of increasing the emissions of these pollutants. hereon, the steel making processes is one of emission sources of heavy metals. according t...

Journal: :iranian journal of toxicology 0
مجید حسین زاده majid hosseinzadeh graduate faculty of environment, university of tehran, tehran, iran. غلامرضا نبی بیدهندی gholamreza nabi bidhendi graduate faculty of environment, university of tehran, tehran, iran. علی ترابیان ali torabian graduate faculty of environment, university of tehran, tehran, iran. ناصر مهردادی naser mehrdadi graduate faculty of environment, university of tehran, tehran, iran.

background: considering the toxic effects of heavy metals and microbial pathogens in industrial wastewaters, it is necessary to treat metal and microbial contaminated wastewater prior to disposal in the environment. the purpose of this study is to assess the removal of heavy metals pollution and microbial contamination from a mixture of municipal and industrial wastewater using membrane bioreac...

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