Preconcentration of Pb(II) by Magnetic Metal-Organic Frameworks and Analysis Using Graphite Furnace Atomic Absorption Spectroscopy

Table 4

Determination of lead in real samples.

Samples	Measured (μg·L^−1)	Added (μg·L^−1)	Found (μg·L^−1)	Recovery (%)	RSD (n = 3)
Tap water	0.30	5	5.24	98.87	0.50
		10	10.27	99.71	0.25
Mineral water	ND	5	5.01	100.2	1.2
		10	10.13	101.3	3.02
Lettuce	0.35	5	5.30	99.06	1.89
		10	10.32	99.7	1.55

ND (not detected) = below the limit of detection.