Complex Formation in a Liquid-Liquid Extraction System Containing Cobalt(II), 4-(2-Pyridylazo)resorcinol, and Nitron

Table 1

Optimum conditions and analytical characteristics of the Co(II)-PAR-Nt-water-chloroform system.

Optimum conditions	Analytical characteristics
Wavelength: 520 nm	Molar absorptivity: 𝜀=6.0×10^4 L mol^−1 cm^−1
pH: 5.3 (acetate buffer)	Beer’s law range: up to 1.7 μg mL^−1
𝐶PAR: 1.0×10^−4 mol L^−1	Limit of detection: 0.06 μg mL^−1
𝐶Nt: 3.0×10^−4 mol L^−1	Limit of quantification: 0.20 μg mL^−1
Shaking time: 15–20 sec	Sandell’s sensitivity: 0.99 ng cm^−2