نتایج جستجو برای: selenium extraction

تعداد نتایج: 180097  

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2004
mahmoud abdollahy seid ziadin shafaei

the recovery process of selenium from iranian sar-cheshmeh copper anode slimes employing hydrometallurgical methods has been investigated. the copper anode slimes are made up of those components of  the anodes, which are not soluble in the electrolyte. they contain varying quantities of precious metals like gold, silver, selenium and tellurium. they are being extracted as a by product in the co...

Journal: :Geochemical Transactions 2007
Ying Zhang Guijian Liu Chen-Lin Chou Lei Wang Yu Kang

Forms of selenium in bituminous coal, anthracite, and cokeite (natural coke) from Huaibei Coalfield, Anhui, China, have been determined by sequential solvent extraction. The selenium content in bulk samples is 4.0, 2.4, and 2.0 microg/g in bituminous coal, anthracite, and cokeite, respectively. The six forms of selenium determined by six-step solvent extraction are water-leachable, ion-exchange...

Precious metals are currently associated with selenium (naumannite, Ag2Se) and tellurium (calaverite, AuTe2; sylvanite, (Au,Ag)2Te4) to form species refractory to cyanidation. The aim of this preliminary work was to study the use of the solvent extraction technique to recover tellurium and selenium ions from a synthetic solution similar to the cyanidation effluents to recycle the free cyanide b...

2011
Mohammad Hosein Soruraddin Rouhollah Heydari Morteza Puladvand Mir Mehdi Zahedi

A simple, rapid, and sensitive spectrophotometric method for the determination of trace amounts of selenium (IV) was described. In this method, all selenium spices reduced to selenium (IV) using 6 M HCl. Cloud point extraction was applied as a preconcentration method for spectrophotometric determination of selenium (IV) in aqueous solution. The proposed method is based on the complexation of Se...

Journal: :Metallomics : integrated biometal science 2015
Fatai Adigun Aborode Andrea Raab Simon Foster Enzo Lombi William Maher Eva M Krupp Joerg Feldmann

Three month old Thunbergia alata were exposed for 13 days to 10 μM selenite to determine the biotransformation of selenite in their roots. Selenium in formic acid extracts (80 ± 3%) was present as selenopeptides with Se-S bonds and selenium-PC complexes (selenocysteinyl-2-3-dihydroxypropionyl-glutathione, seleno-phytochelatin2, seleno-di-glutathione). An analytical method using HPLC-ICPMS to de...

2003
J. C. Feo

One area of astrobiology is devoted to duplicating conditions that exist on remote planets and moons (like Mars and Europa) on Earth, and studying the life that survives there. A variety of bacteria can thrive in inhospitable environments. An essential nutrient for life at low concentration can be a deadly poison at higher concentration. Fourier-transform infrared (FT-IR) spectroscopy is employ...

Journal: :The American journal of clinical nutrition 2009
Kate Ashton Lee Hooper Linda J Harvey Rachel Hurst Amélie Casgrain Susan J Fairweather-Tait

BACKGROUND To understand the effect of selenium intake on health, it is important to identify sensitive and population-specific biomarkers of selenium status. OBJECTIVE The objective of this systematic review was to assess the usefulness of biomarkers of selenium status in humans. DESIGN The methods included a structured search strategy on Ovid MEDLINE, EMBASE (Ovid), and Cochrane databases...

2004
Recai İNAM Çiğdem TOPRAK

Determination of selenium in biological and environmental samples is usually difficult due to its trace or ultra-trace quantities, pre-concentration stages, destruction of organic matrices by acid digestion and oxygen plasma combustion followed by separation from interfering metal ions such as ion exchange separation, solvent extraction or hydride generation. Selective separation of selenium is...

2018
Zhanglian Xu Takashi Okada Susumu Yonezawa

During reductive heat-treatment of bismuth borosilicate glass with palladium and selenium, palladium is extracted along with bismuth as a liquid metal phase. Selenium may then be extracted from the oxide phase in a subsequent water-leaching step. However, selenium extraction can be hindered by partial transfer of the selenium to the metal. To suppress such selenium transport, the effect of vary...

Journal: :Bulletin of the Chemical Society of Japan 1966

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید