Table 1.

Linearity and sensitivity of the methods studied.

Statistical parameters	Method		System
	Potentiometric titration	Complexometric titration	Potentiometric titration	Complexometric titration
Regression equation	y = 2.5202x + 0.0004	y = 18.899x − 0.0011	y = 2.5192x − 0.0003	y = 18.898x − 0.0035
Determination coefficient	1	1	1	1
Standard error of the slope	0.0011	0.0049	0.0002	0.0032
Standard intercept error	0.001	0.0047	0.0002	0.0029
t-calculate	2349.9	3877.9	11330	5780.4
Sensitivity (LOD)∗	0.0013	0.0159	0.0004	0.0159
Sensitivity (LOQ) ∗	0.0038	0.0534	0.0014	0.0534

^∗% ZnPT.