Potentiometric monitoring of cobalt in beer sample by solid contact ion selective electrode
Abstract
A new solid contact cobalt selective electrode was constructed with 4-tert-butylthiacalix[4]arene as ionophore. The best performance was observed with the membrane having an ionophore/polyvinyl chloride/sodium tetraphenylborate/nitrophenyl octyl ether ratio of 3.5:33:1.5:62 (w/w; mg). The electrode, under steady-state conditions, exhibited a working concentration range of 1 × 10-1 - 1 × 10-6 mol/L with a near-Nernstian slope of 25.3 mV/decade and a detection limit of 3.5 × 10-7 mol/L. The electrode had a very short response time (<10 seconds) and good reproducibility at a working pH range of 4.0-6.5. The electrode was used for 4 months without any significant change in its sensitivity. The potentiometric performance of the electrode in partially nonaqueous medium [up to 20 % (v/v) alcohol] was found satisfactory. The performance of the prepared electrode for the analysis of beer samples using direct potentiometric method is very encouraging. © 2014, Food and Drug Administration, Taiwan. Published by Elsevier Taiwan LLC. All rights reserved.
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Recommended Citation
Eren, H.; Uzun, H.; Andac, M.; and Bilir, S.
(2014)
"Potentiometric monitoring of cobalt in beer sample by solid contact ion selective electrode,"
Journal of Food and Drug Analysis: Vol. 22
:
Iss.
4
, Article 9.
Available at: https://doi.org/10.1016/j.jfda.2014.03.003
Fulltext URL
http://www.fda.gov.tw/tc/includes/GetFile.ashx?id=f636695782241711399
