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, 𝐵1/cm	5–30	15
	Reactor, 𝐵2/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

I, II and III, hydrodynamic, chemical, and physical parameters.