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 |
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Results
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| Anion |
Concentration [g/L] |
RSD [%, n = 7] |
| 1 |
Vanadium (IV) |
8.64 |
0.7 |
| 2 |
Vanadium (V) |
1.25 |
1.1 |
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This information has been sourced, reviewed and adapted from materials provided by Metrohm AG.
For more information on this source, please visit Metrohm AG.