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Separation and determination of vanadium in fertiliser by capillary electrophoresis with a light-emitting diode detector

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posted on 2023-05-16, 13:49 authored by Vachirapatama, N, Miroslav MackaMiroslav Macka, Paul HaddadPaul Haddad
A method has been developed for determination of vanadium, as an anionic ternary complex of vanadium(V) with 4-(2-pyridylazo) resorcinol (PAR) and hydrogen peroxide, after separation by capillary electrophoresis (CE). The optimum conditions for the formation of the ternary complex were acetate buffer (3 mmol L-1) at pH 6 containing 0.15 mmol L-1 PAR and 7.1 mmol L-1 H2O2. The CE separation was conducted using 15 mmol L-1 acetate buffer at pH 6 as the background electrolyte; the separation potential was -30 kV and the injection time 100s. The vanadium complex was detected photometrically at 568 nm, by use of a light-emitting diode (LED); the detection limit was 19 ppb. The method was applied to the analysis of vanadium in fertilisers. Clean-up of the digested fertiliser sample, with Sep-Pak C18 coated with tetrabutylammonium hydroxide, before analysis was used to remove matrix ions which otherwise caused electrophoretic de-stacking. Vanadium levels found in the fertiliser samples by use of the CE method were found to be comparable with results obtained by HPLC and ICP-MS.

History

Publication title

Analytical and Bioanalytical Chemistry

Volume

374

Issue

6

Pagination

1082-1085

ISSN

1618-2642

Department/School

School of Natural Sciences

Publisher

Springer-Verlag Berlin

Place of publication

Berlin, Germany

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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