Table 1.
Study of interferences at ascorbic acid determination by DPV at a Pt 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 | 150 | less than 3% |
| 200 | 4.8% decrease | |
| Citric acid | 25 | less than 3% |
| 50 | 3.9% decrease | |
| 100 | 5.2% decrease | |
| 150 | 6.4% decrease | |
| 200 | 7.9% decrease | |
| Tartaric acid | 50 | less than 3% |
| 100 | 5.3% increase | |
| 150 | 6.1% increase | |
| 200 | 9.5% increase | |
| Benzoate anion | 100 | less than 3% |
| 150 | 4.7 % decrease | |
| 200 | 6.9 % decrease |