Separation and Preconcentration of Trace Amounts of Manganese and Nickel from Natural Water Samples by a Diimine Derivative Schiff Base-Coated Silica-Gel Minicolumn

Table 5

Comparison of the proposed SPE method with other SPE methods reported in the literature.

Adsorbent	Element	LOD^a (𝜇g L^−1)	R.S.D.^b (%)	PF^c	Sample volume (mL)	Reference
Coated alumina	Mn, Ni	0.27, 0.28	—	75	150	[13]
Nanometer TiO2	Mn, Ni	0.52, 1.78	2.4, 5.5	50	50	[14]
Chelating resin	Mn, Ni	0.20, 0.71	—	150	1500	[15]
Chromosorb 108	Mn, Ni	0.33, 0.44	1.8, 1.4	80	400	[16]
Coated silica-gel	Mn, Ni	0.20, 0.15	2.5, 2.3	200	1000	Present work

^aLimit of detection, ^bRelative standard deviation, ^cPreconcentration factor.