Solid Phase Extraction of Inorganic Mercury Using 5-Phenylazo-8-hydroxyquinoline and Determination by Cold Vapor Atomic Fluorescence Spectroscopy in Natural Water Samples

Table 12

Comparison of figures of merits for different preconcentration methods for Hg(II) ion.

Chelating resin	DT^a	pH	Capacity; (mmol·g^−1)	LOD^b (pg⋅mL^−1)	PF^c	Reference^d
(1) poly(acrylamide) grafted onto cross-linked poly(4-vinyl pyridine) (P4-VP-g-PAm)	AFS	1–8	4.1	2	20	[9]
(2) Silica gel/2-thiophenecarboxaldehyde	AAS	2	2	4.75	1000	[10]
(3) Sodium dodecyl sulphate-coated magnetite nanoparticles/Michler’s Thioketone complexes	ICP-AES	3	—	40	1230	[11]
(4) Magnetic nanoparticles doped with 1,5-diphenylcarbazide	CV-AAS	6	0.22	160	100	[12]
(5) Poly-allylthiourea	CV-AAS	2	1.1	80	160	[13]
(6) Silica gel/2-(2-oxoethyl)hydrazine	ICP-AES	4	0.18	100	50	[14]
(7) Polyaniline (PANI)	gold trap-CVAAS	1–12	0.49	0.05	120	[15]
(8) Hg(II)-Ionic imprinted polymers-thymine	AFS	8	0.014	30	200	[16]
(9) Silica gel/cysteine	CV-AAS	1–7	0.69	1.5	40	[17]
(10) Alumina/dimethylsulfoxide	AAS	1-2	381	—	1000	[18]
(11)C18/Isopropyl 2-[(isopropoxycarbothioly)disulfany]ethane thioate	CV-AAS	3–7	0.015	5	>150	[19]
(12) Hg(II)-imprinted ion polymer	CV-AAS	8	0.205	50	200	[20]
(13) Agar powder modified with 2-mercaptobenzimidazole	CV-AAS	2-3	1.89	20	100	[21]
(14) Hg(II)-imprinted thiol-functionalized mesoporous sorbent	ICP-AES	4–8	0.022	390	150	[22]
(15) Silica gel immobilized 5-phenylazo-8-hydroxyquinoline	CV-AFS	4	0.027	0.21	>250	This work

aDetection technique; ^blimit of detection; ^cpreconcentration factor; ^dreference.