Microwave-Assisted Digestion of Polyurethane Foam as an Alternative to Elution: Solid Phase Extraction of Cd(II) and Pb(II) for Their Determination in Swimming Pool Waters

Table 4

Results obtained for recoveries of spike additions of lead and cadmium in water samples.

Sample	Pb concentration (μg L^−1)		Recovery (%)	Cd concentration (μg L^−1)		Recovery (%)
SPW1	0	<LOQ	—	0	0.22 ± 0.04	—
	10.0	8.3 ± 0.2	83 ± 2	1.0	1.14 ± 0.16	92 ± 16
SPW2	0	<LOQ	—	0	0.44 ± 0.09	—
	10.0	9.2 ± 0.4	92 ± 4	1.0	1.37 ± 0.04	93 ± 3
SPW3	0	<LOQ	—	0	1.02 ± 0.04	—
	10.0	8.8 ± 0.3	88 ± 3	1.0	2.05 ± 0.05	103 ± 3
SPW4	0	11.4 ± 2	—	0	0.86 ± 0.03	—
	10.0	21.9 ± 0.8	105 ± 4	1.0	1.68 ± 0.04	82 ± 2