Analytische Chemie
Filtern
Dokumenttyp
Sprache
- Englisch (2)
Referierte Publikation
- nein (2) (entfernen)
Schlagworte
- Fluorescence (2) (entfernen)
Organisationseinheit der BAM
- 8.1 Sensorik, mess- und prüftechnische Verfahren (2) (entfernen)
This paper describes the development of a semi-automatic gas measurement device presenting potentially a broad range of applications, noteworthy in the agricultural sector. Non-reversible fluorescent molecular sensors were designed and syn-thesized. Upon, integration into a hydrogel matrix with an optimal ratio of co-solvents, the sensors reacting selectively to ammonia were illuminated by excitation light to produce a concentration-correlated fluorescence emission. An automated mechanical-elec-trical device initiates a given gas mixture and thus simulates con-centrations similar to a threshold value. The aim of this project is to develop a sensor or a low-cost method which can monitor low concentrations of harmful gases and aid in their elimination or regulation in livestock housing, barns or stables.
Contamination of natural bodies of water with oil and lubricants (or generally, hydrocarbon derivatives such as petrol, fuel and others) is a commonly found phenomenon around the world due to the extensive production, transfer and use of fossil fuels. In this work, we develop a simple system for the on-field detection of total petroleum hydrocarbons (TPH) in water and soil. The test is based on fluorescence emission of a 4-dimethylamino-4′-nitrostilbene derivative (4-DNS-OH). This fluorescent molecular rotor is embedded in a hydrophobic polymeric matrix (PVDF), avoiding interactions with water and providing a robust support for use in test-strip fashion. For the fluorescence detection a portable sensor device was developed, featuring two excitation LEDs, a micro-spectrometer and Bluetooth control. A limit of detection of at least 6 ppm of TPH in water was demonstrated.