Table 6 Recovery results of heavy metal ions in herbal samples

From: A new sorbent based on MWCNTs modification for separation/preconcentration of trace amounts of Cd(II), Cr(III), Cu(II), Ni(II), and Pb(II) and their determination by flame atomic absorption spectrometry

	Cu(II)^a			Cr(III)^a
Sample	Added^b	Found^b	Recovery (%)	Added^b	Found^b	Recovery (%)
Lettuce	–	–	–	0	0.43 ± 0.08	–
	–	–	–	5.0	5.4 ± 0.11	99.4
	–	–	–	10.0	10.37 ± 0.17	99.4
Mushroom	0	13.71 ± 0.59	–	–	–	–
	5.0	18.58 ± 0.14	97.4	–	–	–
	10.0	23.78 ± 0.23	100.7	–	–	–
Black tea	0	19.68 ± 1.09	–	0	5.39 ± 1.12	–
	5.0	24.46 ± 0.41	95.6	5.0	10.24 ± 1.05	97.0
	10.0	29.75 ± 0.39	103.9	10.0	15.14 ± 0.82	97.5

^aMean ± standard deviation (n = 5)
^bUnites by mg kg⁻¹

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