Table 5: Analytical characteristics of [Fe(II)-HNAHBH].

ParameterDirect methodFirst derivativeSecond derivativeThird derivative
405 nm427 nm421 nm435 nm415 nm426 nm

Beer’s law range (μg mL−1)0.055–1.3730.027–1.3760.027–1.3760.027–1.3760.027–1.3760.027–1.376
Molar absorptivity, (L mol−1 cm−1)
Sandell’s sensitivity, (μg cm−2)0.0012
Angular coefficient (m)0.9740.0720.0060.0930.0020.085
Y-intercept (b)0.0047−0.0045
Correlation coefficient0.99970.99990.99990.99990.99990.9999
RSD (%)2.190.850.760.891.311
Detection limit (μg mL−1)0.0650.10.0220.02680.0360.304
Determination limit, (μg mL−1)0.1970.30.0680.80.110.914
Composition (M : L)2 : 3
Stability constant