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

Table 6

Metal ion charge to radius ratio [8].

Ion	Oxidation state	Coordination number	𝑍/𝑅
Pb	2	6	1,68
Zn	2	6	2,7
Cd	2	6	2,11
Cu	2	6	2,74
Ni	2	6	2,9
Cr	3	6	4,88
Co	2	6	2,7
V	2	6	2,53
Fe	3	6	4,651
Hg	2	6	1,96
As	3	6	5,117
Mn	2	6	2,98