Speciation of Vanadium(IV) and Vanadium(V) using UV/VIS Detection

The Benfield Process is a popular method used for the removal of CO2 and H2S from industrial and petroleum gases. Vanadium pentoxide is added as a corrosion inhibitor and is shown to be most effective when added in a certain V(IV)/V(V) ratio.

Therefore, speciation and determination of V(IV) and V(V) is very important. It is easy to achieve this speciation on A Metrosep A Supp 5 - 50/4.0 column using UV/VIS detection at 282 nm and EDTA as an eluent.

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Sample

Benfield solution

Sample Preparation

Dilution of 0.2 g of sample in 100 mL of diluent.

Columns

. .
Metrosep A Supp 5 - 50/4.0 6.1006.550
Metrosep RP 2 Guard/3.5 6.1011.030

Solutions

. .
Eluent 20 mmol/L EDTA trisodium salt
Diluent 20 mmol/L EDTA trisodium salt

Analysis

UV/VIS detection

Parameters

Flow rate 0.8 mL/minutes
Injection volume 20 μL
Pmax 15 MPa
Recording time 4 minutes
Column temperature 30 °C
Wavelength 282 nm
Measuring duration 500 ms

Instrumentation

940 Professional IC Vario ONE 2.940.1100
944 Professional UV/VIS Detector Vario 2.944.0010
858 Professional Sample Processor 2.858.0020

Results

Anion Concentration [g/L] RSD [%, n = 7]
1 Vanadium (IV) 8.64 0.7
2 Vanadium (V) 1.25 1.1

This information has been sourced, reviewed and adapted from materials provided by Metrohm AG.

For more information on this source, please visit Metrohm AG.

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