A Green Preconcentration Method for Determination of Cobalt and Lead in Fresh Surface and Waste Water Samples Prior to Flame Atomic Absorption Spectrometry

Table 1

Influences of some foreign ions on the recoveries of cobalt and lead (20 μg L⁻¹) determination by applied CPE method.

Ion	Concentration (𝜇g L^−1)	Pb recovery (%)	Co recovery (%)
Na^+	20000	97±2.14	98±2.22
K^+	5000	98±2.21	99±3.02
Ca^2+	5000	98±2.12	97±1.12
Mg^2+	5000	97±1.04	98±3.08
Cl^−	30000	99±2.05	98±3.04
F^−	1000	96±3.01	97±1.12
NO^3−	3000	97±1.04	98±3.06
HCO3^−	1000	98±3.12	97±2.04
Al^3+	500	97±2.21	99±3.05
Fe^3+	50	96±2.23	97±3.02
Zn^2+	100	97±3.05	96±2.32
Cr^3+	100	96±2.08	98±2.25
Cd^2+	100	97±3.12	98±3.22
Ni^2+	100	96±2.23	97±3.01