P. Lessi et al., SORPTION AND PRECONCENTRATION OF METAL-IONS ON SILICA-GEL MODIFIED WITH 2,5-DIMERCAPTO-1,3,4-THIADIAZOLE, Analytica chimica acta, 327(2), 1996, pp. 183-190
Silica gel, chemically modified with 2,5-dimercapto-1,3,4-thiadiazole
[=Si(CH2)(3)-NC2HNS3], abbreviated as SiB, was used to adsorb metal io
ns from ethanol by both batch and column techniques. Elution of Cu(II)
was done with a solvent mixture of acetone and hydrochloric acid (9:1
v/v). Zn(II), Cd(II), Ni(II), Pb(II), Co(II) and Fe(III) were eluted
with 0.5 mol l(-1) HC1 in ethanol solution. The modified silica was ap
plied in the preconcentration of metal ions from commercial ethanol, n
ormally used as engine fuel. The method is suitable for quantifying th
ese metals at low mu g l(-1) levels.