Table 2.
Study of interferences at ascorbic acid determination by DPV at a carbon paste electrode, performed on some chemical species commonly found in fruit juices, soft drinks and wines.
| Interferent | Interferent/analyte molar ratio | Influence on the analytical peak height |
|---|---|---|
| Glucose | 200 | less than 3% |
| Citric acid | 50 | less than 3% |
| 100 | 3.6 % decrease | |
| 150 | 4.2 % decrease | |
| 200 | 5.8 % decrease | |
| Tartaric acid | 50 | less than 3% |
| 100 | 3.8 % increase | |
| 150 | 5.5 % increase | |
| 200 | 6.7% increase | |
| Benzoate anion | 100 | less than 3% |
| 150 | 5.7 % decrease | |
| 200 | 8.1% decrease |