Table 2.

Effect of the presence of competitive ions on the separation of Ru(III) ions (100 ng) on IIP with methacrylic acid (2 mL of sample: pH 4.1, mean value ± SD for n = 3)

Metal ion	Cint/CRu	Ru retention efficiency, %	Ru elution efficiency, %	Recovery,%
Ru(III)	–	93.4 ± 1.5	89.7 ± 0.7	83.8 ± 1.6
Pd(II)	1	91.2 ± 1.3	91.6 ± 2.1	83.6 ± 2.1
	10	86.9 ± 3.2	91.3 ± 2.3	79.3 ± 4.8
Pt(IV)	1	87.8 ± 2.0	91.2 ± 0.9	80.1 ± 1.3
	5	91.5 ± 2.2	91.3 ± 2.3	83.6 ± 4.1
	10	74.7 ± 3.2	94.8 ± 1.9	72.7 ± 1.3
Rh(III)	1	92.7 ± 3.5	89.9 ± 1.4	83.3 ± 2.1
	10	83.2 ± 1.9	91.4 ± 3.0	76.0 ± 3.3
Co(II)	1	94.5 ± 2.9	90.9 ± 2.9	85.9 ± 1.0
	10	93.1 ± 3.7	94.3 ± 1.7	87.6 ± 3.0
Ni(II)	1	96.7 ± 4.2	91.7 ± 3.9	88.7 ± 6.4
	10	83.5 ± 1.8	98.5 ± 4.7	82.2 ± 2.3
Fe(III)	1	96.6 ± 1.8	84.6 ± 1.9	81.8 ± 2.8
	10	97.7 ± 0.4	48.9 ± 4.6	47.8 ± 4.5
	10	97.8 ± 2.1	68.3 ± 1.9	66.8 ± 1.5a
	10	95.2 ± 1.1	77.6 ± 6.6	76.9 ± 0.6b
	10	94.4 ± 0.8	79.8 ± 2.4	75.4 ± 2.8c

^a Column clean-up with 4 mL of 0.05 mol L⁻¹ CH₃COOH,

^b Sample pH 3.5,

^c Sample pH 3.5 and column clean-up with 4 mL of 0.05 mol L⁻¹ CH₃COOH.