Determination of Aluminum(III) in Crystallized Fruit Samples Using a Multicommutated Flow System

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• 作者：Ildik&oacute ; V. T&oacute ; th ; Ant&oacute ; nio O. S. S. Rangel ; Joã ; o L. M. Santos ; and José ; L. F. C. Lima
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2004
• 出版时间：May 5, 2004
• 年：2004
• 卷：52
• 期：9
• 页码：2450 - 2454
• 全文大小：67K
• 年卷期：v.52,no.9(May 5, 2004)
• ISSN：1520-5118

文摘

A multicommutated flow system was developed for the determination of aluminum in crystallizedfruit samples. Spectrophotometric determination is based on the reaction of aluminum with chromeazurol S. The binary sampling technique was implemented to improve mixing conditions and tominimize 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-linedilution. The influence of the chemical and physical parameters on the performance of the systemwas studied. Detection limits of 0.1, 0.6, and 0.8 ppm were obtained for the lowest, the medium, andthe highest dispersion system, respectively. The procedure was applied to the determination ofaluminum in crystallized fruit extracts. The results were in agreement with those obtained by thereference flame atomic absorption procedure at a 95% confidence level. Repeatability (RSD) wasbetter than 2.4% in all of the three application zones.Keywords: Multicommutation; zone sampling; aluminum(III); crystallized fruits; spectrophotometry