{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,16]],"date-time":"2026-02-16T20:22:16Z","timestamp":1771273336463,"version":"3.50.1"},"reference-count":42,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2020,1,31]],"date-time":"2020-01-31T00:00:00Z","timestamp":1580428800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002383","name":"King Saud University","doi-asserted-by":"publisher","award":["Project No. RSP-2019\/66"],"award-info":[{"award-number":["Project No. RSP-2019\/66"]}],"id":[{"id":"10.13039\/501100002383","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Screen-printed membrane sensors based on the use of paper and ceramic substrates are fabricated, characterized, and used for rapid batch and continuous monitoring of CrIII in the form of CrO42\u2212 in some industrial products and wastewater samples. Strips of paper and ceramic platforms (15 \u00d7 5 mm) were covered with conductive carbon paint and then modified with polyaniline (PANI) film, to act as an ion-to-electron transducer, followed by a drop casting of plasticized poly (vinyl chloride) (PVC) Rhodamine-B chromate membrane as a recognition sensing material. In a 5.0 mmol L\u22121 Trizma buffer solution of pH ~8, the fabricated paper and ceramic based membrane sensors exhibited a near Nernstian response for CrVI ion with slopes of \u221229.7 \u00b1 0.5 and \u221228.6 \u00b1 0.3 mV decade\u22121, limit of detection 2.5 \u00d7 10\u22125 and 2.4 \u00d7 10\u22126 mol L\u22121 (1.3\u20130.12 \u00b5g mL\u22121), and linear concentration range 7.5 \u00d7 10\u22123\u20135.0 \u00d7 10\u22125 and 7.5 \u00d7 10\u22123\u20131.0 \u00d7 10\u22125 mol L\u22121 (390-0.5 \u00b5g mL\u22121), respectively. Both sensors exhibited fast and stable potentiometric response, excellent reproducibility, and good selectivity with respect to a number of common foreign inorganic species. Impedance spectroscopy and chronopotentiometry data revealed a small resistance and a larger double layer capacitance due to the presence of the intermediate polyaniline (PAN) conductive layer. Furthermore, the formation of a water layer between the ion selective membrane (ISM) and the underlying conductor polymer and between the conducting polymer and the carbon conducting surface was greatly reduced. The developed disposable solid-contact potentiometric sensors offer the advantages of simple design, long term potential stability, flexibility, miniaturization ability, short conditioning time, and cost effectiveness that enable mass production. The sensors were successfully used for static and hydrodynamic measurements of total chromium in some leather tanning wastewater and nickel-chrome alloy samples. The results compare favorably with data obtained by atomic absorption spectrometry.<\/jats:p>","DOI":"10.3390\/molecules25030629","type":"journal-article","created":{"date-parts":[[2020,1,31]],"date-time":"2020-01-31T11:55:56Z","timestamp":1580471756000},"page":"629","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Paper Strip and Ceramic Potentiometric Platforms Modified with Nano-Sized Polyaniline (PANi) for Static and Hydrodynamic Monitoring of Chromium in Industrial Samples"],"prefix":"10.3390","volume":"25","author":[{"given":"Saad S. M.","family":"Hassan","sequence":"first","affiliation":[{"name":"Chemistry Department, Faculty of Science, Ain Shams University, Abbasia, Cairo 11566, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7502-6668","authenticated-orcid":false,"given":"Ayman H.","family":"Kamel","sequence":"additional","affiliation":[{"name":"Chemistry Department, Faculty of Science, Ain Shams University, Abbasia, Cairo 11566, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1338-706X","authenticated-orcid":false,"given":"Abd El-Galil E.","family":"Amr","sequence":"additional","affiliation":[{"name":"Pharmaceutical Chemistry Department, Drug Exploration &amp; Development Chair (DEDC), College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia"},{"name":"Applied Organic Chemistry Department, National Research Center, Dokki, Giza 12622, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6873-2991","authenticated-orcid":false,"given":"M.","family":"Abdelwahab Fathy","sequence":"additional","affiliation":[{"name":"Chemistry Department, Faculty of Science, Ain Shams University, Abbasia, Cairo 11566, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9866-343X","authenticated-orcid":false,"given":"Mohamed A.","family":"Al-Omar","sequence":"additional","affiliation":[{"name":"Pharmaceutical Chemistry Department, Drug Exploration &amp; Development Chair (DEDC), College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,1,31]]},"reference":[{"key":"ref_1","first-page":"941","article-title":"Abnormal trace metals in man-Chromium","volume":"15","author":"Schroeder","year":"1962","journal-title":"J. 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