Heavy metal adsorption on iron oxide and iron oxide-coated silica ...

Table 8.2 EXAFS Results of Ni Standards at Ni K EdgeFourier transform was performed over range, NiO 2.50-10.99 A -1, NiCO 3 •nH 20 2.4-9.3 A-I, Ni2+ (aq) 2.36-9.27 A -I ; NiO was fitted over 0.73-3.18 A,NiCO 3 •nH 20 0.65-4.3 A, and Ni2+ (aq) 0.27-2.23 A.N, coordination number; R, interatomic distance; a 2, Debye—Waller factor; AE 0, edge shift.An S 02 of 0.8 was used to account for self-absorption based on the ratio of fluorescence to transmission data for aqueous Ni2+ .I Wyckoff (1988)2 Pertlik (1986)