Empfindliche Bestimmung von Vanadin in Gu�eisen und St�hlen mit 2,7-Diaminofluoren

Hainberger, L.; Nozaki, Jorge

doi:10.1007/bf01197980

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…In a number of other publication abstracts it was not mentioned whether an extraction preceded the use of the following reagents for the determination of V in steels, mostly at the trace level. Those used include 4-(l-hydroxy-l,2,4triazolyl-3-azo)-2-methylresorcinol (134), 4-(2-pyridinylazo)resorcinol (147), prochlorperazine bismethanesulfonate (139), for cast irons and steels, 2,7-diaminofluorene (151), Eriochrome Cyanine R and the surfactant CTAB ( 206 Acid dissolution of iron and steel samples in aqua regia with an aluminum-containing buffer was used to prepare samples for a direct atomic absorption spectrometric determination of V in a nitrous oxide-acetylene flame (159). Another report also confirms that vanadium levels from 0.5% to 10% or greater in steels and high-speed steels were successfully measured by atomic absorption spectrometry with the aid of a radiation buffer addition to the sample solution (430).…”

Section: Vanadiummentioning

confidence: 99%

Ferrous analysis

Straub¹,

Hurwitz²

1985

Anal. Chem.

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Section: Vanadiummentioning

confidence: 99%

Ferrous analysis

Straub¹,

Hurwitz²

1985

Anal. Chem.

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Selective method for the spectrophotometric determination of vanadium in the presence of other refractory elements with 2,2′-iminodibenzoic acid

Zhou¹,

Chun-xiang²,

Gu³

et al. 1994

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A selective method for the spectrophotometric determination of V in the presence of other refractory elements is proposed. It is based on the re-examination of its redox reaction with 2,2'-iminodibenzoic acid in H2SO4 medium (11.1-11.4 mol 1-1) in the presence of H3P04. Up to 1 mg of TiIV, Z P , NbV, Mow and Wvl do not interfere. V should be pre-oxidized in H2SO4 medium (S6.5 rnol 1-1) at room temperature with a 0.1% m/v solution of potassium permanganate, the excess of which is removed by adding successively 1 ml of a 10% m/v solution of urea and a few drops of a 0.1% solution of sodium nitrite. The molar absorptivity of this system was found to be 1.2 X 104 1 mol-1 cm-1 at 610 nm. The Lambert-Beer law is obeyed over the concentration range 0.4-2.0 pg ml-1 of V with the linear regression equation A = 0.0188C-0.0229 (C = pg of V per 25 ml) and correlation coefficient r = 0.9990. The standard deviation ( n = 10) and relative standard deviation at the level of 20 pg of V were found to be 0.88 pg and 4.4%, respectively. The versatility of the proposed method was demonstrated by incorporation of the preconcentration of V with N-benzoyl-N-phenylhydroxylamine as precipitant and MoV1 as carrier.

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Empfindliche Bestimmung von Vanadin in Gu�eisen und St�hlen mit 2,7-Diaminofluoren

Cited by 2 publications

References 3 publications

Ferrous analysis

Ferrous analysis

Selective method for the spectrophotometric determination of vanadium in the presence of other refractory elements with 2,2′-iminodibenzoic acid

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