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

Table 2

Effect of foreign ions on the recovery of cobalt (100 μg L⁻¹).

Ion	Ion/Co(II) ratio	Recovery (%)
NO3−	1000	99.8
ClO4−	1000	100.1
K^+	1000	99.8
Li^+	1000	99.6
Cl^−	1000	99.4
SO42−	1000	99.7
I^−	1000	99.6
F^−	1000	99.7
PO43−	500	99.4
Ca^2+	500	99.8
Mg^2+	500	99.8
Cu^2+	100	100.2
Fe^2+	100	101.2
Fe^3+	100	101.1
Mn^2+	50	99.1
Cr^3+	50	101.3
Al^3+	50	100.6
Bi^3+	30	102.1
Cd^2+	30	101.3
Zn^2+	30	102.2
Ag^+	5	97.9
Hg^2+	5	97.8