Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10560037 | Talanta | 2011 | 5 Pages |
Abstract
The development, evaluation and application of a simple and low-cost graphite carbon electrode for the direct determination of citrate in food samples are described here. The electrode exhibits a linear response with a slope of â29.0 ± 1.0 mV decadeâ1 in a concentration range of 0.07-7.0 mmol Lâ1 in 0.1 mol Lâ1 KCl/1.0 mmol Lâ1 phosphate buffer solution with a limit of detection of 3.0 μmol Lâ1. The electrode is easily constructed at a relatively low cost and has a fast time response (within 120 s) with no significant changes in its performance characteristics. The performance of the graphite sensor was tested to determine citrate in beverage samples (juices and an isotonic drink), and the results were validated against a reference procedure. The proposed method is quick, inexpensive, selective and sensitive, and is based entirely on conventional instrumentation.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Celso L. Araújo, Edmar I. Melo, NÃvia M.M. Coelho,