8. Conclusions
The present CPE procedure may be applied as a quality control
tool to determine total Sn present at trace levels in beverage samples.
The procedure developed using GC+ in presence of glycine and
CPC at pH 8.5 with detection by FAAS allowed the direct determination
of total Sn at trace levels in beverages with and without
alcohol. Due to the separation and preconcentration step, it was
possible to obtain a low limit of detection in a working range of
250-fold. Further, it involves the use of FAAS, a simple technique
of easy operation, which has low operational and maintenance
costs compared with other absorption or emission techniques like
HG-AAS, GF-AAS, ICP-OES and ICP-MS. Also, it involves the use of
an eco-friendly non-toxic surfactant rather than the organic solvents,
which are conventionally used in trace analysis.