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The proposed sensor homogenization and mechanism of action was studied by infra-red (IR) and scanning electron microscope (SEM) with energy dispersive X-ray (EDX) tools. The sensor covered 1.0\u2009\u00d7\u200910<jats:sup>\u22127<\/jats:sup>\u20131.0\u2009\u00d7\u200910<jats:sup>\u20131<\/jats:sup>\u00a0mol\u00a0L<jats:sup>\u22121<\/jats:sup> linear range and a detection limit of 7.22\u2009\u00d7\u200910<jats:sup>\u20138<\/jats:sup>\u00a0mol\u00a0L<jats:sup>\u22121<\/jats:sup> for Cr(III) with 20.17\u2009\u00b1\u20090.13\u00a0mV decade<jats:sup>\u22121<\/jats:sup> Nernstian slope. 5\u00a0s was the response time of the prepared sensor and it was reproducible and stable for 3\u00a0months. The working pH range was 3.3\u20136.0 and it also works well to determine Cr(III) ion in presence of water miscible solvents up to 12.5% content of the methanol and 17.5% of ethanol. The electrode\u2019s selectivity was studied using separate and mixed solution methods for selectivity coefficients determination and the sensor showed good selectivity relative to a variety of metal ions (selectivity coefficients =\u20091.01\u2009\u00d7\u200910<jats:sup>\u22125<\/jats:sup>\u20138.57\u2009\u00d7\u200910<jats:sup>\u22123<\/jats:sup>). In addition, the practical analysis value of the sensor was demonstrated by measurement of Cr(III) quantitatively in mineral water, supplement and also as an indicator electrode in Cr(III) against EDTA potentiometric titration with good reproducibility (RSDs of 0.91\u20132.15%).<\/jats:p>","DOI":"10.1038\/s41598-024-69176-y","type":"journal-article","created":{"date-parts":[[2024,8,17]],"date-time":"2024-08-17T08:02:01Z","timestamp":1723881721000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Carbon paste based sensor for sensitive Cr(III) ion determination in different water samples and anti-diabetic supplement"],"prefix":"10.1038","volume":"14","author":[{"given":"Aya E.","family":"Ali","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Asmaa M.","family":"Mohamed","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gehad G.","family":"Mohamed","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,8,17]]},"reference":[{"key":"69176_CR1","volume-title":"Chromium in Nutrition and Metabolism","author":"D Shapcott","year":"1979","unstructured":"Shapcott, D. & Hubert, J. 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