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


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Vachirapatama, N, Macka, M and Haddad, PR 2002 , 'Separation and determination of vanadium in fertiliser by capillary electrophoresis with a light-emitting diode detector' , Analytical and Bioanalytical Chemistry, vol. 374, no. 6 , pp. 1082-1085 , doi: 10.1007/s00216-002-1564-8.

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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 time100 s. 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.

Item Type: Article
Authors/Creators:Vachirapatama, N and Macka, M and Haddad, PR
Keywords: Capillary electrophoresis, Fertiliser, Vanadium, Ternary complexes
Journal or Publication Title: Analytical and Bioanalytical Chemistry
ISSN: 1618-2642
DOI / ID Number: 10.1007/s00216-002-1564-8
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