Naslov
Investigation of Potential-Sensitive Dyes for Application in Solid-State Ion Sensors

Autori
G. J. Mohr, I. Murkovic, O. S. Wolfbeis

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
3rd European Conference on Optical Chemical Sensors and Biosensors, EUROPT(R)ODE III / - , 1996

Skup
3rd European Conference on Optical Chemical Sensors and Biosensors, EUROPT(R)ODE III

Mjesto i datum
Zürich, Švicarska, 1996

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
optodes; nitrate sensors; nitrite sensors; potassium sensors; mercury sensors; fluorescence; polarity probes

Sažetak
The applicability of two potential-sensitive dyes (PSDs) for optical sensing of ions is reported. In particular, nitrate-and nitrite-responsive as well as potassium-and mercury-sensitive polymer membranes have been developed. In general, membranes are composed of a plasticized polymer, an ion carrier and a fluorescent dye which optically transduces the extraction of the analyte ion in the polymer matrix. The nitrate sensor membrane is composed of rhodamine B octadecylester and the anion-exchange catalyst is tridodecylmethylammonium chloride. Both are dissolved in plasticized PVC. The nitrite sensor is based on the same dye and the same polymer matrix but with benzyl-bis(triphenylphosphine) palladium(II) chloride acting as the nitrite-selective carrier. The potassium sensor membrane consists of the carbocyanine dye DiOC16(3), valinomycin and a lipophilic berate salt. The mercury 'sensor' is based on the irreversible decomposition of berate by mercury ions and is composed of DiOC16(3) and berate only. All sensor membranes have been investigated in terms of signal change, sensitivity, stability, limits of detection and the selectivity for the analyte over interferent ions. The mechanism of the sensor membranes is discussed on the basis of changes of the microenvironment of solvatochromic dyes, which result in analyte-dependent signal changes.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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