Variables

Operational Conditions

% R ± RSD

pH of the medium

6.6

6.8

7.0

E_acc = 0.1 V

t_acc = 80 s

97.95 ± 2.04

99.03 ± 1.74

98.17 ± 2.77

Preconcentration potential (E_acc)

0

0.1

0.2

pH = 6.8

t_acc = 80 s

98.06 ± 2.55

99.03 ± 1.74

97.08 ± 1.13

Preconcentration time (t_acc)

75

80

85

pH = 6.8

E_acc = 0.1 V

97.19 ± 1.54

99.03 ± 1.74

98.27 ± 2.64

Inter-laboratory precision

Lab (1)

Lab(2)

pH = 6.8

E_aac = 0.1 V

t_acc = 80 s

99.03 ± 1.74

97.84 ± 2.04