Table 3.

Determination of lead in real samples.

Sample	Lead amount (ng mL−1)		Recovery (%)
	Added	Found*
Tap water	0.0 5.0	5.6 ± 0.3 10.5 ± 0.6	— 98.0
Mineral water 1	0.0 5.0	6.9 ± 0.4 12.1 ± 0.7	— 104.0
Seawater	0.0 5.0	4.7 ± 0.3 9.8 ± 0.7	— 102.0
River water, Kohpayeh, Kerman	0.0 5.0	2.9 ± 0.2 7.7 ± 0.7	— 96.0
Urine	0.0 1.0	0.073 ± 0.004 1.085 ± 0.068	— 101.2

*Average ± standard deviation (n = 3).