Flame Atomic Absorption Spectrometric Determination of Trace Amounts of Silver after Solid-Phase Extraction with 2-Mercaptobenzothiazole Immobilized on Microcrystalline Naphthalene

Table 3

A comparison between the figures of merit of the proposed method with similar SPE methods for Ag determination by FAAS.

Sorbent material	Reagent	pH	PF	DL/𝜇g L^−1	Reference
Polystyrene-divinylbenzene	6-Mercaptopurine	5.5–6.0	—	29	[24]
Silica gel	2,4,6-Trimorpholino-1,2,3-triazin	3.0–6.0	130	—	[25]
Silica gel	MBT	AM	—	0.66	[15]
Alumina	MBT	1.0–6.0	100	—	[16]
Alumina	Dithizone	1.0–9.0	100	—	[26]
Alumina	DDTC	1.0–7.0	125	0.7	[7]
Multiwalled carbon nanotubes	—	7.0–9.0	50	0.6	[27]
Moringa oleifera seeds	—	6.0–8.0	35	0.22	[28]
Naphthalene	MBT	0.5–6.0	160	0.02	This work

PF: preconcentration factor; DL: detection limit; Pb-DDTC: lead diethyl dithiocarbamate; MBT: 2-mercaptobenzothiazole; DDTC: diethyl dithiocarbamate; AM: acidic medium (0.05–6 mol L⁻¹ nitric acid).