Sequential injection analysis of free and total potassium in wines using potentiometric detection and microwave digestion

• Type: Article in International Scientific Journal
• Date: 2003

Authors

Zarate, S (Author) Other; Araujo, AN (Author) FFUP; Montenegro, MCBSM (Author) FFUP; Perez Olmos, R (Author) Other

Journal

Title: American Journal of Enology and Viticulture

Vol. 54 No. 1

Pages: 46-49

ISSN: 0002-9254

Publisher: American Society for Enology and Viticulture

Indexing

ISI Web of Knowledge - 5 Citations

ISI Web of Science

Scopus - 9 Citations

Scientific classification

FOS: Agrarian Sciences > Other Agrarian Sciences

CORDIS: Health sciences

Other information

Authenticus ID: P-000-J4A

Resumo (PT): An automatic procedure for the determination of free and total potassium in wines is described that combines sequential injection analysis with potentiometric detection. A sequential injection mounting is coupled to a microwave system to conduct the on-line digestion of the sample, thereby making the injection of samples possible without prior treatment. Free potassium was determined by injecting 110 µL of sample and forwarding it to the detection system. In the evaluation of total potassium, the sample was previously digested with 390 µL of hydrogen peroxide for 60 seconds at 700 W in a microwave oven. Using an optimized mounting, 10 samples of different wine types were analyzed (white, red, and port), and results were then compared with those provided by flame emission photometry. Relative standard deviations obtained were always below 3% and sampling rate attained was about 14 samples per hour. <br> <br> Key words: Sequential injection analysis, potentiometry, free and total potassium, microwave digestion <br> <a target="_blank" href="http://www.ajevonline.org/cgi/content/abstract/54/1/46 "> Texto integral</a> <br> <br>

Abstract (EN): An automatic procedure for the determination of free and total potassium in wines is described that combines sequential injection analysis with potentiometric detection. A sequential injection mounting is coupled to a microwave system to conduct the on-line digestion of the sample, thereby making the injection of samples possible without prior treatment. Free potassium was determined by injecting 110 muL of sample and forwarding it to the detection system. In the evaluation of total potassium, the sample was previously digested with 390 muL of hydrogen peroxide for 60 seconds at 700 W in a microwave oven. Using an optimized mounting, 10 samples of different wine types were analyzed (white, red, and port), and results were then compared with those provided by flame emission photometry. Relative standard deviations obtained were always below 3% and sampling rate attained was about 14 samples per hour.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4