Table 2 Analytical performance data for the determination of DRT, CAFF and PAR by the double divisor method

Wavelength (nm)

309 nm

288 nm

255 nm

Linearity range (µg/mL)

2–20

1.5–15

2–40

Intercept (a) × 10^–3

− 8.360

0.0002

0.0147

Slope (b) × 10^–3

22.164

0.016

0.026

Correlation coefficient (r)

0.9998

0.9999

0.9999

S.D. of residuals (S_y/x) × 10^–3

2.72

0.001

0.004

S.D. of intercept (S_a) × 10^–3

1.46

0.7 × 10^–3

2 × 10^–3

S.D. of slope (S_b) × 10^–3

0.18

0.1 × 10^–3

0.1 × 10^–3

% RSD^a

1.08

0.75

0.9

% Error^b

0.44

0.31

0.37

LOD^c (µg/mL)

0.22

0.14

0.24

LOQ^d (µg/mL)

0.66

0.42

0.71