Determination of Cu (II) ions using sodium salt of 4-phenylsemicarbazone 1,2-naphthoquinone-4-sulfonic acid in natural and industrial environments

Ecological Processes

Table 1 Calculation of error for the calibration curve (P = 0.95, t = 3.18)

C · 10⁻⁵, mol/L	Mass m _i, g	Confidence interval d _i	Standard error (SE) of arithmetic mean S	Mean square error Δ	m _m ± δ
1.41	0.0028	0.0001	0.0001	0.0002	0.0027 ± 0.0002
2.02	0.0027	0
2.64	0.0026	0.0001
3.29	0.0026	0.0001