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Gallardo-Gonzalez J, Baraket A, Boudjaoui S, Metzner T, Hauser F, Rößler T, Krause S, Zine N, Streklas A, Alcácer A, Bausells J, Errachid A. A fully integrated passive microfluidic Lab-on-a-Chip for real-time electrochemical detection of ammonium: Sewage applications. Sci Total Environ 2019; 653:1223-1230. [PMID: 30759562 DOI: 10.1016/j.scitotenv.2018.11.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 10/31/2018] [Accepted: 11/01/2018] [Indexed: 06/09/2023]
Abstract
The present work reports on the development of a new generation of Lab-on-a-chip (LOC) to perform in-situ and real-time potentiometric measurements in flowing water. The device consisted of two differentiated parts: a poly (dimethylsiloxane) (PDMS) microfluidic structure obtained by soft lithography and a fully integrated chemical sensing platform including four working microelectrodes, two reference microelectrodes and one counter microelectrode for detecting ammonium in a continuous mode. The performance of the device was evaluated following its potentiometric response when analyzing ammonium containing samples. As a key parameter, its time of response was compared to that of a commercially available electrical conductivity sensor used as reference sensor during tests in laboratory using flowing tap water and technical scale using flowing wastewater. As a result, the LOC showed a slope of 55 mV/decade, a limit of detection of 4·10-5 M and a time of full response between 10 and 12 s. It was demonstrated that the device can provide fast and reliable data at real time when immersed in a laminar flow of water. Moreover, the test of robustness showed that it was still functional after immersion in sewage for at least 15 min. Besides, the LOC reported here can be helpful for a wide variety of flowing-water applications such as aqua culture outlets control, in-situ and continuous analysis of rivers effluents and sea waters monitoring among others.
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Affiliation(s)
- J Gallardo-Gonzalez
- Université de Lyon, Institut des Sciences Analytiques, UMR 5280, CNRS, Université de Lyon 1, ENS Lyon-5, 5 rue de la Doua, F-69100 Villeurbanne, France.
| | - A Baraket
- Université de Lyon, Institut des Sciences Analytiques, UMR 5280, CNRS, Université de Lyon 1, ENS Lyon-5, 5 rue de la Doua, F-69100 Villeurbanne, France
| | - S Boudjaoui
- Université de Lyon, Institut des Sciences Analytiques, UMR 5280, CNRS, Université de Lyon 1, ENS Lyon-5, 5 rue de la Doua, F-69100 Villeurbanne, France
| | - T Metzner
- University of Munich, Institute of Hydro Sciences, Sanitary Engineering and Waste Management, Werner-Heisenberg-Weg 39, D-85577 Neubiberg, Germany
| | - F Hauser
- Bundeskriminalamt, Forensic Science Institute, Wiesbaden, Germany
| | - T Rößler
- Bundeskriminalamt, Forensic Science Institute, Wiesbaden, Germany
| | - S Krause
- University of Munich, Institute of Hydro Sciences, Sanitary Engineering and Waste Management, Werner-Heisenberg-Weg 39, D-85577 Neubiberg, Germany
| | - N Zine
- Université de Lyon, Institut des Sciences Analytiques, UMR 5280, CNRS, Université de Lyon 1, ENS Lyon-5, 5 rue de la Doua, F-69100 Villeurbanne, France
| | - A Streklas
- Barcelona Microelectronics Institute IMB-CNM (CSIC), Bellaterra, Spain
| | - A Alcácer
- Barcelona Microelectronics Institute IMB-CNM (CSIC), Bellaterra, Spain
| | - J Bausells
- Barcelona Microelectronics Institute IMB-CNM (CSIC), Bellaterra, Spain
| | - A Errachid
- Université de Lyon, Institut des Sciences Analytiques, UMR 5280, CNRS, Université de Lyon 1, ENS Lyon-5, 5 rue de la Doua, F-69100 Villeurbanne, France
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Abstract
We report on a typical case of a ciliary body melanoma in a 59-year-old female, which was only noticed due to nonspecific unilateral vision disorders and which could only be seen in maximal mydriasis via a gonioscopic three-mirror lens. We further discuss tumor monitoring via ultrasound biomicroscopy (UBM) and execution and prognosis of Ru-106 brachytherapy.
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Affiliation(s)
- A Ćirković
- Augenklinik, Universitätsklinikum der Friedrich-Alexander-Universität Erlangen-Nürnberg, Schwabachanlage 6, 91054, Erlangen, Deutschland,
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Scholz B, Rößler T, Benedikt A, Dingermann T, Marschalek R. The AF4/AF4-MLL interactome. Klin Padiatr 2011. [DOI: 10.1055/s-0031-1277092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Rößler T, Viestenz A, Wecke T, Behrens-Baumann W. Arteriitis temporalis – ein multifaktorielles Krankheitsbild. Klin Monbl Augenheilkd 2009. [DOI: 10.1055/s-0029-1242967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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