Table 1 Spectral features and validation parameters for the studied colorimetric approach

λ_εξ (νµ)

545

Linear range (µg mL^− 1)

1–9

1–6

Correlation coefficient (r)

0.9995

0.9995

Determination coefficient (r²)

0.999

0.9991

Intercept ± SD*

0.3882 ± 3.671 × 10^− 3

0.3745 ± 2.449 × 10^− 3

Slope ± SD

0.0552 ± 6.52 × 10^− 4

0.0534 ± 6.21 × 10^− 4

Sy.x**

0.005053

0.00294

***LOD (µg mL^− 1)

0.22

0.15

****LOQ (µg mL^− 1)

0.66

0.46