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In Situ Spectroelectrochemical Monitoring of Dye Bleaching after Electrogeneration of Chlorine-Based Species: Application to Chloride Detection
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry. DropSens, Soc Limitada, Edificio CEEI,Parque Tecnol Asturias, Llanera 33428, Asturias, Spain.ORCID iD: 0000-0002-9385-7577
DropSens, Soc Limitada, Edificio CEEI,Parque Tecnol Asturias, Llanera 33428, Asturias, Spain..
DropSens, Soc Limitada, Edificio CEEI,Parque Tecnol Asturias, Llanera 33428, Asturias, Spain..
DropSens, Soc Limitada, Edificio CEEI,Parque Tecnol Asturias, Llanera 33428, Asturias, Spain..
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2018 (English)In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 90, no 12, p. 7442-7449Article in journal (Refereed) Published
Abstract [en]

Spectroelectrochemical techniques are becoming increasingly versatile tools to solve a diverse range of analytical problems. Herein, the use of in situ real-time luminescence spectroelectrochemistry to quantify chloride ions is demonstrated. Utilizing the bleaching effect of chlorine-based electrogenerated products after chloride oxidation, it is shown that the fluorescence of the rhodamine 6G dye decreases proportionally to the initial chloride concentration in solution. A strong decrease of fluorescence is observed in acidic media compared to a lower decrease in alkaline media, which suggests that Cl-2, favorably generated at low pH, could be the main species responsible for the fluorescence loss. This fact is corroborated with chronoamperometric measurements where the complete loss of fluorescence for the bulk solution is achieved. A fast mass transfer is needed to explain this behavior, in agreement with the generation of gaseous species such as Cl-2. Chloride detection was performed in artificial sweat samples in less than 30 s with great accuracy. This electrochemical/optical combined approach allows us to quantify species that are difficult to measure by electrochemistry due to the inadequate resolution of their redox processes or being without significant optical properties.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 90, no 12, p. 7442-7449
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Physical Sciences
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URN: urn:nbn:se:kth:diva-240227DOI: 10.1021/acs.analchem.8b00942ISI: 000436028800050PubMedID: 29775045Scopus ID: 2-s2.0-85049046566OAI: oai:DiVA.org:kth-240227DiVA, id: diva2:1270774
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QC 20181214

Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2018-12-14Bibliographically approved

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Martín-Yerga, Daniel

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