Potentiometric flow injection determination of glycerol in distilled spirits. |
| |
| Authors: | Ana Paula G Gervasio Eduardo P Borges Elias A G Zagatto Boaventura F Reis Rui A S Lapa José L F C Lima |
| |
| Affiliation: | Centro de Energia Nuclear na Agricultura, Universidade de S?o Paulo, Box 96, Piracicaba SP 13400-970, Brazil. |
| |
| Abstract: | A single-line flow injection system including a tubular periodate-selective electrode without inner reference solution is proposed for glycerol determination in distilled spirits, based on oxidation of this polyol by periodate. Interferences due to 5.0 mg L(-1) Cu, 5000 mg L(-1) sucrose, and 3000 mg L(-1) fructose plus glucose were investigated. The procedure is characterized by a linear response for 20-500 mg L(-1) glycerol (r > 0.9999, n = 7), a relative standard deviation of results of <0.03, and an analytical throughput of 30 determinations per hour. Accuracy was assessed by applying the procedure to distilled spirits of sugarcane and grape already analyzed by HPLC; in addition, recoveries within 96 and 120% were obtained. |
| |
| Keywords: | |
|
|
