Results 111 to 120 of about 514 (161)

Determination of trace europium by adsorptive cathodic stripping voltammetry after complexation with cupferron

Electroanalysis, 1997
This article describes the determination of Eu by adsorptive cathodic stripping voltammetry after complexation with N-nitroso-N-phenylhydroxylamine (cupferron).
Maurizio Aceto, Constant van den Berg, Ornella Abollino   +2 more
exaly   +2 more sources

Some of the next articles are maybe not open access.

Related searches:

Separation of niobium and tantalum with Cupferron

Die Naturwissenschaften, 1957
Abstract An attempt to separate niobium and tantalum by cupfcrron was only moderately successful at pH 4.5 to 5.5 in the presence of a magnesia mixture as a coagulating agent. A more satisfactory separation of niobium and tantalum from each other, tried out up to ratios of 30:1 and 1.30, is effected with Sn +2 or Sn +4 as a co-precipitating agent ...
A.K. Majumdar, J.B. Ray Chowdhury
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

Cupferron as a reagent in qualitative analysis

Journal of Chemical Education, 1969
A short on the use of cupferron (nitrosophenylhydroxylamine, NH4+ salt) for the removal of Cu(II) from a solution containing both Cu(II) and Cd(II).
A. O. Parks, Betsy DuBose
openaire   +1 more source

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

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

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

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

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