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Flow Injection Sequential Speciation of Free and Total Potassium in Fortified Wines

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Abstract

A flow injection system for the potassium speciation in fortified wines, using two detectors placed in series, is described. The free, or ionized form, is monitored in a tubular-shaped potassium ion-selective electrode, and the total potassium content in a flame emission spectrometer used as end-of-line detector. Potassium determinations can be carried out in a linear range from 300 to 2000 mgl−1, with a sampling-rate of 60 samples per hour. The results obtained were comparable to the conventional procedures using the same detection systems, and the precision was good (relative standard deviations below 3.1% for free potassium and 3.8% for total potassium).

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Authors and Affiliations

  1. Escola Superior de Biotecnologia, Vniversidade Católica Portuguesa, Rua Dr. António Bernardino de Almeida, 4200, Porto, Portugal

    António O. S. S. Rangel & Ildikó Y. Tóth

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  1. António O. S. S. Rangel
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  2. Ildikó Y. Tóth
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Rangel, A.O.S.S., Tóth, I.Y. Flow Injection Sequential Speciation of Free and Total Potassium in Fortified Wines. ANAL. SCI. 12, 887–891 (1996). https://doi.org/10.2116/analsci.12.887

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  • DOI: https://doi.org/10.2116/analsci.12.887

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