Table 1 Validation parameters of the recommended chromatographic methods for determination of LEVA and TCBZ

Wavelength (nm)

215 nm

215 nm

Linearity range (mg/L)

3.75–37.5 mg/L

6–60 mg/L

2–14 mg/L

2–14 mg/L

Intercept

32507

35799

1175.3

3700.1

Slope

49529

69627

1201.5

922.73

Correlation coefficient (r²)

0.9999

0.9999

0.9998

0.9998

Accuracy (Mean ± SD)

99.78 ± 1.8

99.70 ± 1.0

100.11 ± 0.95

100.12 ± 0.67

Precision

 Repeatability (% RSD)

0.58

0.62

1.1

0.56

 Intermediate precision (% RSD)

0.64

0.67

1.1

0.58

 LOD (mg/L)

0.712

1.099

0.538

0.446

 LOQ (mg/L)

2.157

3.331

1.632

1.353