- Titel
- Highly Sensitive Enhanced Electrochemical Sensors for Direct Detection of Nitro-compounds (N) and Phosphate (P) for Water Quality Monitoring
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:ch1-qucosa2-955162
- Schriftenreihe
- Scientific Reports on Measurement and Sensor Technology
- Bandnummer
- Volume 28
- Datum der Einreichung
- 02.10.2024
- Datum der Verteidigung
- 10.12.2024
- ISBN
- 978-3-96100-232-0
- E-ISBN
- 978-3-96100-233-7
- E-ISSN
- 2509-5110
- ISSN
- 2509-5102
- DOI
- https://doi.org/https://doi.org/10.51382/978-3-96100-233-7
- Abstract (EN)
- This thesis develops highly sensitive electrochemical sensors for continuous monitoring of nitrogen and phosphorus compounds in water. Overuse of these fertilizers dramatically impacts aquatic ecosystems and poses health risks, necessitating efficient field-deployable sensors. Carbon screen-printed electrodes (CSPE) serve as transducers for all analytes due to their ease of use, high surface area, and minimal sample requirements. Three sensors were developed: (1) Gold nanoparticles (~12 nm) capped with polyethylenimine for nitrite detection, achieving the lowest reported limit of detection (LoD) at 2.5 nM with linear range 0.01-4.0 µM. (2) Eco-friendly chitosan-tetra sulfonated copper phthalocyanine composite for nitrite (40-100 µM, LoD 0.06 µM at pH 6) and nitrate detection (1-10 µM, LoD 0.05 µM at pH 2). (3) Reagent-less phosphate sensor using copper phthalocyanines and modified carbon nanotubes, achieving 0.31 nM LoD in a rangeof 0.001-100 µM. All sensors demonstrated low interference, high reproducibility (<10% RSD), and successful validation in real samples (tap water, olive water, aquaponics) with 69.94-120% recovery rates. A 3D-printed flow cell integrated all sensors for simultaneous nutrient detection in complex water samples.
- Freie Schlagwörter (EN)
- Electrochemical sensors, Nitrate, Nitrite, Phosphates, Nanomaterials, 2D materials, Chemical Sensor Symposium
- Klassifikation (DDC)
- 600
- 620
- 621
- 543
- Normschlagwörter (GND)
- Phosphate, Nanostrukturiertes Material, Nitroverbindungen
- GutachterIn
- Prof. Dr. Olfa Kanoun
- Prof. Dr. Mounir Ben Ali
- BetreuerIn Hochschule / Universität
- Prof. Dr. Olfa Kanoun
- Verlag
- Universitätsverlag Chemnitz, Chemnitz
- Den akademischen Grad verleihende / prüfende Institution
- Technische Universität Chemnitz, Chemnitz
- Version / Begutachtungsstatus
- publizierte Version / Verlagsversion
- URN Qucosa
- urn:nbn:de:bsz:ch1-qucosa2-955162
- Veröffentlichungsdatum Qucosa
- 30.09.2025
- Dokumenttyp
- Dissertation
- Sprache des Dokumentes
- Englisch
- Lizenz / Rechtehinweis
CC BY 4.0- Inhaltsverzeichnis
Chapter 1 Introduction Chapter 2 Electrochemical sensors theoretical background Chapter 3 State of the art on nitrogen and phosphate compounds determination Chapter 4 Electrochemical detection of nitrite at trace levels Chapter 5 Electrochemical detection of nitrate and nitrite Chapter 6 Phosphate electrochemical detection Chapter 7 Proof of concept and application in real scenario Chapter 8 Conclusion and outlook