Trace amounts of Fe3þ, Pb2þ, Cu2þ, Ni2þ, Co2þ and Zn2þ ions were efficiently
enriched following complexation with silica-gel chemically functionalized with
2-((3-silylpropylimino)methyl)-5-bromophenol. The enriched metal ions efficiently
eluted with 6mL of 4.0 mol L1 nitric acid and their metal contents
were determined by flame atomic absorption spectrometry (FAAS).
The influences of the analytical parameters and experimental variables on the
recoveries of the metal ions under study were investigated and optimized. The
method has high sorption preconcentration efficiency even in the presence of
various interfering ions. At optimum values of all variables the method is
applicable for analysis of real samples with recoveries in the range of 95 to 105%
with RSD lower than 4.2% and detection limits between 1.4 and 2.8 mgL1.
