Cellulose Acetate-Based pH Indicator Optodes

Abstract

Some pH indicators for use in optode membranes based on cellulose acetate have been prepared, and applications of membranes containing octyl bis (2,4-dinitrophenyl)acetate in static and flowing systems are discussed.

Carrier-Based Ion-Selective Electrodes and Bulk Optodes. 2. Ionophores for Potentiometric and Optical Sensors

“…Whereas H + was detected by complexation with a Nile Blue derivative as the selective chromoionophore, no ionophore was used for anion binding. Similar efforts based on octyl bis(2,4-dinitrophenyl)acetate ( H + -35 ) as a charged carrier for H + and coextraction of an anion were less successful, probably because of interference from buffer ions .…”

“…Similar efforts based on octyl bis(2,4-dinitrophenyl)acetate (H + -35) as a charged carrier for H + and coextraction of an anion were less successful, probably because of interference from buffer ions. 99 The response of an optode with an azobenzene ionophore (H + -36) was based on competitive exchange of Na + and H + , but no Na + ionophore was used. 100 Bulk optodes based on an acridine derivative as H + ionophore (H + -37) were found to respond to H + in the range from pH 6 to 9 but the response mechanism and possible influence and nature of a coextracted anion was not discussed.…”