Table 3 Analytical figures of merit of the applied UA-DSPME/HPLC-DAD method for preconcentration of CBZ

Regression equation before preconcentration

y = 0.073x + 6.7261

Regression equation after preconcentration

y = 35.735x + 12.972

Linear range (ng mL⁻¹)

0.1–800

Limit of detection (LOD) (ng mL⁻¹)

0.08

Limit of quantification (LOQ) (ng mL⁻¹)

0.29

Repeatability (RSD, %) (N = 10)

1.4

Reproducibility (RSD, %) (N = 5)

4.2

Preconcentration factor (PF)

490