A micelle-mediated preconcentration method has been developed for determination of trace amounts of tin
in canned beverage samples, which is widely used in food industry for packing, but its utilization is limited
due to its toxic properties. The method is selectively based on the cloud point extraction (CPE) of Sn(IV) with
Gallocyanin (GC+
) and glycine as chelating agents in the mixed surfactant media, Polyethylene glycol sorbitan
monolaurate (Tween 20) and Cetylpyridinium chloride (CPC) in Tris/HCl buffer, pH 8.5. The various
variables affecting CPE efficiency were extensively optimized. Under the optimized conditions, the obtained
calibration curve was highly linear in the range of 1–250 lg L1 for Sn(IV) with a good correlation coefficient
of 0.9976. The detection limit of the method was 0.33 lg L1
, and the relative standard deviations, RSDs, was
in the range of 2.1–6.2% (25, 50 and 100 lg L1
, N: 5). The matrix effect was also investigated. The method
was successfully utilized for the determination of total Sn in some canned beverages by Flame Atomic
Absorption Spectrometry (FAAS). Its validity was controlled by the analysis of two certified reference materials.
It has been observed that the results are in agreement with the certified values.