Results 11 to 20 of about 138,539 (119)

Unraveling the Mineralogical Complexity of Sediment Iron Speciation Using Sequential Extractions

Geochemistry, Geophysics, Geosystems, 2020
Iron speciation is one of the most widely applied proxies used to reconstruct oxygen levels and redox conditions in past aqueous environments. The iron speciation proxy estimates proportions of different reactive iron species in fine‐grained sedimentary ...
S. P. Slotznick, E. A. Sperling, N. J. Tosca, A. J. Miller, K. E. Clayton, N. A. G. M. vanHelmond, C. P. Slomp, N. L. Swanson‐Hysell   +7 more
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Avaliação de procedimentos de extração dos óxidos de ferro pedogênicos com ditionito-citrato-bicarbonato de sódio Evaluation of pedogenic iron oxide extraction procedures with sodium dithionite-citrate-bicarbonate

Revista Brasileira de Ciência do Solo, 2003
Em 20 amostras hematíticas e goethíticas de horizontes B latossólicos, uma de B plíntico, uma de B incipiente e uma de saprolito, foram avaliados dois procedimentos de extração de óxidos de ferro pedogênicos (Fe d) por ditionito-citrato-bicarbonato de ...
A. V. Inda Junior, N. Kämpf
doaj   +1 more source

Purification of natural zeolite-clinoptilolite for medical application-Extraction of lead [PDF]

Journal of the Serbian Chemical Society, 2005
A series of experiments of the leaching of lead and other cations from three samples of natural zeolite–clinoptilolite, (Sample 1–deposit Zlatokop, Vranjska Banja, Serbia and Montenegro; Sample 2–deposit Bala Mare, Romania; Sample 3–Igros near Brus ...
MAGDALENA TOMASEVIC-CANOVIC
doaj   +3 more sources

Preparation of Highly Pure Vanadyl Sulfate from Sulfate Solutions Containing Impurities of Iron and Aluminum by Solvent Extraction Using EHEHPA

Metals, 2017
The preparation of highly pure vanadyl sulfate from sulfate solutions containing impurities of iron and aluminumwas investigated by solvent extraction with 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (EHEHPA) and tri-n-butyl phosphate (TBP) as ...
Dan Li, Desheng Chen, Guozhi Zhang, Hongxin Zhao, Tao Qi, Weijing Wang, Lina Wang, Yahui Liu   +7 more
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Separation of Manganese and Iron from Reductive Leaching Liquor of Electric Arc Furnace Dust of Ferromanganese Production Units by Solvent Extraction

Journal of Chemical and Petroleum Engineering, 2011
Electric arc furnace dust (EAFD) of ferromanganese production units, in the form of slurry, contains tar, alkalies, manganese, zinc, iron, silica, calcium, aluminum and other elements.
Behzad Ghafarizadeh, Fereshteh Rashchi
doaj   +1 more source

The influence of iron oxidation state on quantitative MRI parameters in post mortem human brain

NeuroImage, 2020
A variety of Magnetic Resonance Imaging (MRI) techniques are known to be sensitive to brain iron content. In principle, iron sensitive MRI techniques are based on local magnetic field variations caused by iron particles in tissue.
Christoph Birkl, Anna Maria Birkl-Toeglhofer, Christian Kames, Walter Goessler, Johannes Haybaeck, Franz Fazekas, Stefan Ropele, Alexander Rauscher   +7 more
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EXTRAÇÃO ASSISTIDA POR ULTRASSOM PARA DETERMINAÇÃO COLORIMÉTRICA DE FERRO EM SOLO: UMA COMPARAÇÃO COM ESPECTROMETRIA DE MASSA COM PLASMA INDUTIVAMENTE ACOPLADO

Química Nova, 2015
A simple procedure for ultrasound-assisted extraction and colorimetric determination of iron in soil samples was developed. The iron concentration in the analyzed samples was determined by the colorimetric method and the results compared with inductively
Paula Cristiana de Freitas, Rui Miguel de Carvalho, Jessee Severo Azevedo Silva, Thiago Prado, Elis Regina Duarte, Vera L. A. Frescura, Eduardo S. Chaves   +6 more
doaj   +1 more source

Online water-soluble iron speciation in ambient aerosols under cloud-water-relevant and neutral conditions [PDF]

Aerosol Research
We present the first online instrument for the speciation of water-soluble iron in ambient aerosols under cloud-water-relevant and neutral conditions, enabling simultaneous quantification of Fe(II) (ws-Fe(II)) and total water-soluble Fe (total ws-Fe ...
S. Lüchtrath, S. Klemer, F. Fröhlich, D. Ceburnis, D. van Pinxteren, H. Herrmann, W. Frenzel, A. Held   +7 more
doaj   +1 more source

Reducing the Competition: A Dual-Purpose Ionic Liquid for the Extraction of Gallium from Iron Chloride Solutions

Molecules, 2020
The separation of gallium from iron by solvent extraction from chloride media is challenging because the anionic chloridometalates, FeCl4− and GaCl4−, display similar chemical properties.
Luke M. M. Kinsman, Carole A. Morrison, Bryne T. Ngwenya, Jason B. Love   +3 more
doaj   +1 more source

Impact of Pulp Density on Extraction of Metals, By Acidithiobacillus ferrooxidans and Pseudomonas fluorescens from Bauxite Ore

Journal of Pure and Applied Microbiology, 2018
Mineral ores are the non-renewable resources of various metals. The extraction of metals is done only from the Ist and IInd grade ore particles and rest is left as such because of low metal content.
Shaikh Shafikh M., Aafreen A. Ahmed, Syed Abrar Ahmed   +2 more
doaj   +1 more source