Pd. Padilha et al., Determination of metal ions in natural waters by flame-AAS after preconcentration on a 5-amino-1,3,4-thiadiazole-2-thiol modified silica gel., ANAL LETTER, 32(9), 1999, pp. 1807-1820
5-amino-1,3,4-thiadiazole-2-thiol groups attached on a silica gel surface h
ave been used for adsorption of Cd(II), Co(II), Cu(II), Fe(III), Ni(II), Pb
(II) and Zn(II) from aqueous solutions. The adsorption capacities for each
metal ion were (in mmol.g(-1)): Cd(II)= 0.35, Co(II)= 0.10, Cu(II)= 0.15, F
e(III)= 0.20, Hg(Il)= 0.46, Ni(II)= 0.16, Pb(II)= 0.13 and Zn(II)= 0.15. Th
e modified silica gel was applied in the preconcentration and quantificatio
n of trace level metal ions present in water samples (river, and bog water)
.