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

Table 9

Effects of different electrolytes on the retention of Hg(II) ions.

Electrolytes (cation/anion)	Foreign ion	Recovery (%)
Na2CO3^a	8,75	95,4 ± 0,15
Na3C6H5O7^a	8,64	95,9 ± 0,16
KNaC4H4O6^a	20,76	96,7 ± 0,21
Na2C2O4^a	30,07	94,2 ± 0,11
KCN^a	40,28	86,7 ± 0,22
Humicacid^b	0,42	96,3 ± 0,14
SO4^2−a	1,04	97,0 ± 0,37
Cl^−a	2,82	95,9 ± 0,26
NO3^−a	1,61	96,9 ± 0,22
F^−a	0,53	94,5 ± 0,14
Co^a2+	1,36	99,1 ± 0,11
Fe^a3+	1,43	97,0 ± 0,91
Ni^a2+	1,36	99,1 ± 0,23
V^a4+	1,57	99,2 ± 0,15
Cu^a2+	1,26	98,3 ± 0,85

a: mmol L⁻¹; b: g L⁻¹.