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Advisor(s)
Abstract(s)
A multicommutated flow system was developed for the determination of aluminum in crystallized
fruit samples. Spectrophotometric determination is based on the reaction of aluminum with chrome
azurol S. The binary sampling technique was implemented to improve mixing conditions and to
minimize reagent consumption. Three different working zones were established (0.5-5.0, 5.0-25.0,
and 10.0-100 ppm) using the zone sampling approach, allowing us to adapt the extent of the in-line
dilution. The influence of the chemical and physical parameters on the performance of the system
was studied. Detection limits of 0.1, 0.6, and 0.8 ppm were obtained for the lowest, the medium, and
the highest dispersion system, respectively. The procedure was applied to the determination of
aluminum in crystallized fruit extracts. The results were in agreement with those obtained by the
reference flame atomic absorption procedure at a 95% confidence level. Repeatability (RSD) was
better than 2.4% in all of the three application zones.
Description
Keywords
Multicommutation Zone sampling Aluminum(III) Crystallized fruits Spectrophotometry
Pedagogical Context
Citation
"Journal of Agricultural and Food Chemistry" . ISSN 0021-8561. 52: 9 (2004) 2450-2454
Publisher
American Chemical Society