Research Article
Detection of Total Phenol in Green and Black Teas by Flow Injection System and Unmodified Screen Printed Electrode
Table 1
Optimization of variables.
| Type | Parameter | Investigated range | Selected value |
| I | Flow rate/mL·min-1 | 0.4–1.6 | 1.2 | | Path length, /cm | 5–30 | 15 | | Reactor, /cm | 10–100 | 50 | | Inj. Volume/μL | 25–100 | 60 | II | K3Fe(CN)6/mM | 0.5–5.0 | 1.0 | | EDTA/M | 0.05–0.5 | 0.25 | III | Potential, mV versus Ag/AgCl | −100 to 600 | 360 |
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I, II and III, hydrodynamic, chemical, and physical parameters.
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