Development of a Cloud-Point Extraction Method for Cobalt Determination in Natural Water Samples

Table 1

Optimum conditions for the CPE of cobalt.

Conditions	Value
pH	5.0
Concentration of chelating agent (mol L^−1)	2×10^−4
Concentration of surfactant (w/v, %)	0.1
Equilibrium temperature (°C)	60
Equilibrium time (min)	5
Centrifugation rate (rpm)	5000
Centrifugation time (min)	5
Diluent	1.0 mol L^−1 HNO3 in ethanol