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

Journal of Analytical Science and Technology

Table 7 Comparison of the proposed method with some recent studies using multiwalled carbon nanotubes as solid phase extractor

Analytes	Adsorbent	Detection method	Enrichment factor	RSD (%)	Detection limit (ng mL⁻¹)	Reference
Pb	MWCNTs	FAAS	20	<2.5	4.9, 8.0	(Ozcan et al. 2010)
Pb, Cu, Cd, Ni	APDC-MWCNTs	FAAS	80	<5	0.3–0.6	(Tuzen et al. 2008)
Pb, Cd	MnO₂-CNTs	ETAAS	100	<3.2	4.4, 1.5	(Yang et al. 2011)
Ni	Activated carbon	FAAS	100	2.28	1.72	(Kiran et al. 2007)
Cu, Ni	MWCNT-hexahistidine-tagged protein	FAAS	29.28	2.4	0.3, 0.63	(Liu et al. 2009)
Cr	MWCNT	FAAS	100	<9	0.9	(Tuzen and Soylak 2007)
Cu, Ni	MWCNTs impregnated with D2EHPA	FAAS	25	<10	50	(Vellaichamy and Palanivelu 2011)
Cu, Pb, Ni	MWCNTs	FAAS	100	2.4–3.4	1.0–2.6	(Ghaedi et al. 2012)
Pb				3.16	0.89
Ni				2.19	0.21
Cr	MWCNTs-EDDA	FAAS	130	3.34	0.15	This work
Cd				2.23	0.04
Cu				1.89	0.14