Results 261 to 270 of about 175,134 (306)

Rapid spectrophotometric determination of chromium(III)

Talanta, 1994
A spectrophotometric procedure is suggested for the determination of Cr(III). The reaction between Cr(III) and 2-(5-bromo-2-pyridylazo)-5-dimethylaminophenol is accelerated by sodium dodecyl sulphate(SDS), sodium benzoate causes a further increase in the absorbance of the chelate. The optimum pH range for the reaction is 5-5.8(benzoate buffer).
Y, Zhao, G, Han
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Chromium (III) coordination capacity of chitosan

International Journal of Biological Macromolecules, 2020
Polycationic chitosan has a strong coordination to heavy metal ions due to its multifunctional hydroxyl and amino groups. However, due to the fast and facile dissolution of chitosan in acidic medium, it is difficult to measure the exact adsorption amount or coordination capacity accurately.
Caroline, Ganglo, Jilong, Rui, Qiufeng, Zhu, Jiaqi, Shan, Zhuoying, Wang, Fan, Su, Dagang, Liu, Jianqiang, Xu, Mengna, Guo, Jun, Qian   +9 more
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The infrared spectra of chromium (III) acetylacetonate and chromium (III) malondialdehyde

Spectrochimica Acta Part A: Molecular Spectroscopy, 1971
Abstract The i.r. spectra (400–4000 cm −1 ) of chromium (III) acetylacetonate and chromium (III) malondialdehyde are reported for the solid state and for solutions in carbon tetrsohloride. Assignments are made on the basis of comparison with other metal derivatives involving these ligands.
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Adsorption of chromium(III) on lignin

Bioresource Technology, 2008
In order to assess the possibility of using lignin to remove Cr(III) from waters, the adsorption of Cr(III) on lignin isolated from black liquor, a waste product of the paper industry, was investigated. The influences of pH, lignin dosage, contact time, ionic strength, Cr(III) concentration and other metals were investigated. The Cr(III) adsorption was
Yun, Wu, Shuzhen, Zhang, Xueyan, Guo, Honglin, Huang   +3 more
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ChemInform Abstract: Chromium(III) Hydrolysis Constants and Solubility of Chromium(III) Hydroxide.

ChemInform, 1987
AbstractFrom the results of determinations of the solubility product of Cr(OH)3(s) and of Cr(III) hydrolysis constants it is clearly shown that 1) polynuclear species do not become dominant, 2) CrOH2+, possibly Cr(OH)0 3, and Cr(OH)‐ 4 are the dominant mononuclear species in a pH range of about 2.6‐14, and 3) hydrolysis constants reported in the ...
D. RAI, B. M. SASS, D. A. MOORE
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Chromium(III) complexes as intermolecular probes

Journal of Magnetic Resonance, 2005
Metal ion complexes provide flexible paramagnetic centers that may be used to define intermolecular contacts in a variety of solution phase environments because both the charge and electronic relaxation properties of the complex may be varied. For most complex ions, there are several proton equilibria that may change the effective charge on the complex
Galina, Diakova, Zachary, Fuller, Ken, Victor, Koichi, Fumino, R G, Bryant   +4 more
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Chromium(III) Complexes with Diethylentriaminepentaacetic Acid

Journal of Coordination Chemistry, 1991
Abstract Complex formation by chromium(III) with diethylentriaminepentaacetic acid (DTPA) has been studied by potentiometry and spectrophotometry. In equimolar solutions or with a ligand excess, complexation is practically complete at pH > 1 and protonation equilibria have been calculated.
BUCCI, Remo, MAGRI', Antonio, NAPOLI, Aldo   +2 more
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Chromium electrodeposition using a chromium(iii) glycine complex

Journal of Applied Electrochemistry, 1998
A flow plating system was used to investigate chromium metal deposition from an electrolyte based on Cr(iii) and glycine. The Cr(iii) glycine species suitable for chromium deposition was identified. The chemical reactions occurring during electrolyte preparation and during metal deposition are discussed.
J. McDOUGALL, M. El-Sharif, S. Ma
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The exchange of chromium between chromium (II) and chromium (III) ions

Recueil des Travaux Chimiques des Pays-Bas, 1954
AbstractA rapid exchange of radioactive chromium has been observed between Cr+++ and Cr++ ions.
H. van der Straaten, A. H. W. Aten
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Racemization and oxygen-18 exchange studies of heterochelate chromium(III) complexes. II. Cations oxalatobis(2,2'-bipyridine)chromium(III), oxalatobis(1,10-phenanthroline)chromium(III), and oxalatobis(ethylenediamine)chromium(III)

Inorganic Chemistry, 1971
The kinetics of racemization and oxygen-18 exchange for Cr(ox)bipy, Cr(ox)(phen), and Cr(ox)(en) (where ox = oxalate ion, bipy = 2,2-bipyridine, phen = 1,10-phenanthroline) have been studied in acid solution. Racemization of Cr(ox)(bipy) is markedly acid dependent whereas Cr(ox)(phen) shows little acid dependence.
Broomhead, J. A., Kane-Maguire, N., Lauder, I.   +2 more
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