engleski

Optode membrane for continuous measurement of silver ions

An optical sensor (optode) membrane for continuous monitoring of silver ion is presented. It is composed of plasticized poly(vinyl chloride) (PVC), a silver- sensitive chromo-ionophore, and a lipophilic berate salt acting as an anionic site. The membrane selectively responds to silver ion in the concentration range from 50 mu M to 10 mM, giving a reversible colour change from blue to pink, with response times of the order of 2 min. The acridinium dye acts as both the recognition element and the chromo-ionophore. Its long-wave absorption band is at around 680 nm, which makes it compatible with existing LED light sources and diode lasers. A lipophilic octadecyl side chain renders it highly lipophilic and this prevents its leakage out of the PVC membrane. Hence, the operational lifetime exceeds 1 week, without any changes in the work function.

silver sensor ; optical sensors ; chromo-ionophore ; spectrophotometry ; PVC membrane

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