Results 221 to 230 of about 81,217 (264)

Adsorption of heavy metal ions by immobilized phytic acid

Applied Biochemistry and Biotechnology, 1997
Phytic acid (myoinositol hexaphosphate) or its calcium salt, phytate, is an important plant constituent. It accounts for up to 85% of total phosphorus in cereals and legumes. Phytic acid has 12 replaceable protons in the phytic molecule, rendering it the ability to complex with multivalent cations and positively charged proteins. Poly 4-vinyl pyridine (
G T, Tsao, Y, Zheng, J, Lu, C S, Gong
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Heavy metal contamination in ion implantation

AIP Conference Proceedings, 1997
Reduction of metallic contamination during ion implantation is becoming increasingly critical for device performance. Modern implanters are being developed with novel beamline coating materials and optics to keep sputtered contamination to a minimum. However chemical processes occur in the implanter which lead to contaminants being deposited onto the ...
Zhiyong Zhao, Daniel F. Downey, Gordon Angel   +2 more
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Interaction of Heavy Metal Ions With Nanomaterials

2018
Increasing water pollution due to heavy metals is a major global concern, and favorable remediation techniques are required. Heavy metal contamination affects both flora and fauna as it enters the food web. The development of nanotechnology and novel nanomaterials production has attracted researchers worldwide.
Suphiya Khan, Sonu Kumari
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Metal Oxide Composites for Heavy Metal Ions Removal

2021
Contamination of heavy metals is a major concern nowadays due to various environmental problems and hazardous effects on human, living organisms and eco-system. It is therefore of paramount importance to devise strategies for heavy metal ions removal which are workable and economical before discharging the wastewater such as industrial wastewater into ...
Safoura Daneshfozoun, Anum Tahir, Zaman Tahir, Awais Ali Aslam, Muhammad Shahid Nazir, Mohd Azmuddin Abdullah   +5 more
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Removal of heavy metal ions by nanofiltration

Desalination, 2013
Abstract This study describes the rejection of heavy metal ions using a commercial nanofiltration membrane (NF270). The effect of feed pH, pressure and metal concentration on the metal rejections and permeate flux and in some cases permeate pH was explored.
B.A.M. Al-Rashdi, D.J. Johnson, N. Hilal
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The effective ion-ion interaction of heavy alkali metals

Solid State Communications, 1982
Abstract The effective ion-ion interaction for the heavy alkali metals is calculated by a full non-local model potential, including exchange and correlation in the screening according to Vashishta and Singwi and in the RPA. The inclusion of the s - d hybridization effects merely following Harrison's theory for transition metals turns out to be ...
F. Bonsignori, A. Magnaterra
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Trace analysis of heavy metal ions by ion chromatography

Chromatographia, 1989
An ion chromatographic separation technique for heavy metal ions is described. Using pressure-stable, silica-based, ion-exchange supports and standard HPLC equipment with post-column reaction detector high resolution is achieved as well as extremely high sensitivity in the parts per trillion (ppt)-range.
H. Bauer, Doris Ottenlinger, Daren Yan
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Combined Effects of Heavy Metal Ions on Bacteria and the Determination of Heavy Metals by Bioassay

Journal of Analytical Chemistry, 2004
In the framework of the development of bioassay, a procedure was developed for studying the combined effects of heavy metal ions on bacteria. The bacterium Bacillus subtilis niger was proposed as an analytical indicator. A universal calculation system was developed that allows one to obtain and analyze functional models of toxicity and the combined ...
A. A. Tumanov, P. A. Krest'yaninov
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Heavy metal ion interactions with Callinectes sapidus hemocyanin: structural and functional changes induced by a variety of heavy metal ions

Biochemistry, 1982
Hemocyanins are oligomeric proteins that reversibly bind oxygen. The oxygen binding site is a binuclear copper center bound to the protein by amino acid side chains. The hemocyanin of the blue crab, Callinectes sapidus, occurs in vivo as a mixture of 25S dodecamers and 16S hexamers, whose oxygen binding properties are identical.
M, Brouwer, C, Bonaventura, J, Bonaventura   +2 more
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The binding of heavy metal ions by papain

Biochimica et Biophysica Acta (BBA) - Specialized Section on Enzymological Subjects, 1964
W F, HERBLIN, P E, RITT
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