Concentration

(μg/mL)

Intra-day

Inter-day

Measured conc

RSD (%)

RE (%)

Measured conc

RSD (%)

RE (%)

0.2

0.196 ± 0.010

5.10

−2.00

0.186 ± 0.012

6.45

−7.00

1

1.013 ± 0.029

2.86

1.30

0.953 ± 0.076

7.97

−4.70

8

8.095 ± 0.288

3.56

1.19

8.269 ± 0.286

3.46

3.36