Inhibitor | Conc. ppm | Hydrogen evolved ml | θ | %IE | ||
Catharanthus extract | 1 M HCl | 6.20 | --- | --- | ||
50 | 4.60 | 0.258 | 25.8 | |||
100 | 3.60 | 0.419 | 41.9 | |||
150 | 3.20 | 0.484 | 48.4 | |||
200 | 2.70 | 0.565 | 56.5 | |||
250 | 2.40 | 0.613 | 61.3 | |||
300 | 2.20 | 0.645 | 64.5 | |||