Table 11: Analytical characteristics of [Co(II)-HNAHBH].

ParameterDirect methodSecond derivativeThird derivative
425 nm431 nm443 nm437 nm449 nm

Beer’s law range (μg mL−1)0.118–3.5340.059–4.7120.059–4.7120.059–1.3800.056–1.380
Molar absorptivity, (L mol−1 cm−1)
Sandell’s sensitivity, μg cm−20.003
Angular coefficient (m)0.3750.00030.0930.00020.009
Y-intercept (b)0.0197
Correlation coefficient0.99990.9990.99990.99990.9999
RSD (%)1.371.844.31.157.6
Detection limit (μg mL−1)0.040.060.130.040.21
Determination limit, (μg mL−1)0.1240.180.390.1140.65
Composition (M : L)2 : 3
Stability constant