Results 121 to 130 of about 455 (167)

Behavior of Technetium Species with Cupferron.

Analytical Chemistry, 1964
Evidence is given for the formation of a pertechnetate adduct with cupferron in acidic media. No indication was found for significant technetium(IV) reactivity, but a technetium(III) cupferrate does exist. Liquid- liquid extraction, supplemented by polarographic study, provides the principal evidence for the conclusions.
G. B. S. Salaria, C. L. Rulfs, P. J. Elving   +2 more
openaire   +1 more source

Gravimetric determination of beryllium with cupferron

Fresenius' Zeitschrift für analytische Chemie, 1962
Beryllium has been determined with cupferron by precipitating the metal at pH 5.8. The complex can be weighed directly as Be (C6H5O2N2)2 containing 3.18% of the metal after drying at 110°C. The metal has also been separated with cupferron masking iron (III), aluminium, cerium, thorium, copper, nickel, cobalt, zinc and cadmium with EDTA The beryllium ...
Jyotirmoy Das, Siddheswar Baneerjee
openaire   +1 more source

Catalytic polarographic wave in the vanadium–cupferron system

Journal of Electroanalytical Chemistry, 2015
Abstract Surface catalytic polarograpfic wave in vanadium(V)–cupferron system has been studied in the buffer media with pH 5 ÷ 7.5. The catalytic wave is observed at − 0.6 ÷ − 0.7 V (SCE), and it could be enhanced by addition of quaternary ammonium salts. This fact implies that catalytically active vanadium species are anionic.
Vladimir D Ivanov
exaly   +2 more sources

Adsorptive stripping measurements of trace aluminum in the presence of cupferron

Talanta, 1993
The adsorptive collection of the aluminum complex with cupferron is exploited for developing a highly sensitive stripping procedure for trace aluminum. Optimal experimental conditions include the use of 2 x 10(-4)M cupferron in PIPES buffer (pH 7.0), an accumulation potential of -0.40 V and a linear potential scan.
J, Wang, J, Lu, R, Setiadji
openaire   +2 more sources

The distribution coefficient of cupferron

Analytica Chimica Acta, 1962
Abstract A spectrophotometric method (or the determination of the distribution coefficient of cupferron, based on a colour reaction of cupferron with sodium pentacyanoammine ferrate(II), is described. A value of 142 was obtained above pH 3 for chloroform and aqueous solutions of perchloric and hydrochloric acid.
openaire   +1 more source

Intermediate analogue inhibitors of mandelate racemase: N-Hydroxyformanilide and cupferron

Bioorganic and Medicinal Chemistry Letters, 2007
Mandelate racemase (MR) catalyzes the 1,1-proton transfer that interconverts the enantiomers of mandelate. The transition state/intermediate analogues N-hydroxyformanilide (K(i)=2.79+/-0.19 microM) and cupferron (K(i)=2.67+/-0.09 microM) are identified as potent competitive inhibitors of MR.
Stephen L Bearne
exaly   +3 more sources

Effect of substituent on the Performance of Cupferron as a Collector for Uranium

Developments in Chemical Engineering and Mineral Processing, 1994
AbstractCupferron derivatives were synthesized and wed as collectors for uranium in the bench‐scale flotation of a uranium ore from Cluff Lake, Saskatchewan, Canada. All the derivatives were found to be more effective than cupferron itself. For alkyl‐substituted cupferrons, uranium recovery increased with an increase in alkyl chain length, with p ...
I. Nirdosh, S.V. Muthuswami, R. Natarajan, R. Jeyaraman   +3 more
openaire   +1 more source

Aluminium Cupferronate, [Al(C6H5N2O2)3]

Acta Crystallographica Section C Crystal Structure Communications, 1995
The Al ion in tris(N-nitroso-N-phenylhydroxylaminato)aluminium(III), [Al(C 6 H 5 N 2 O 2 ) 3 ], has distorted octahedral coordination defined by six O atoms from three chelate ligands [Al-O = 1.875 (4)-1.894 (4) A]. In each ligand the phenyl ring nearly coincides with the plane of the nitrosohydroxylaminato group.
N. Okabe, K. Tamaki, T. Suga, Y. Kohyama
openaire   +1 more source

Determination of uranium by cupferron with complexone iii as the masking agent

Analytica Chimica Acta, 1956
Abstract The reagent cupferron has been found to be effective for the separation of titanium from Zr+4, Th+4 ,Fe+3, Al+3, Cr+3, rare earths, Pb+2, Cu+2, Cd+2, Bi+3, Sb+3, Zn+2, Mn+2, Ni+2, Co+2 Ca+2, Ba+2, Sr+2, alkalis, AsO3-3, AsO4-3, VO4-3, MoO4-2, WO4-2 and B4O7-2 in the prese complexone III at a pH between 4.3 and 7.0.
Anil Kumar Majumdar, Jamini Bhusan Ray Chowdhury   +1 more
openaire   +1 more source

Extraction of the cupferron complex of niobium

Talanta, 1963
Abstract The precipitation of the cupferron complex of niobium is well known, but the literature states that the extraction of the complex with an organic solvent is either not quantitative or suitable for separating only milligram amounts of niobium.
openaire   +1 more source