Epoxy Matrix Membrane Potentiometric Sensor Based on Zirconium Titanium Phosphate Ion Exchanger for Flow Injection Analysis of Nitrite (original) (raw)

Preparation, characterization, origin of response and applications of a potentiometric sensor based on the use of a zirconium titanium phosphate (ZTP)-epoxy membrane are described. Zirconium titanium phosphate (ZTP) cationic exchanger embedded in an epoxy matrix is converted into a hydrated zirconium oxide anion exchanger which responds to many anionic species. A sensor based on this exchanger exhibits near-Nernstian response for nitrite and other anions over the concentration range 10 71 ±10 75 M. Under optimized conditions, the gas dialyzera¯ow-injection system provides a throughput of ca. 60 samples per hour with a high selectivity for nitrite ion over most common anions and acidic gas releasing species. Determination of nitrite at levels as low as 5610 74 M or less in the presence of sul®te and sul®de ions is performed by using a modi®ed carrier buffer stream (10 72 M MES, pH 5.5 containing formaldehyde and Pb 2 ). Signi®cant advantages are offered by the ZTP-epoxy membrane based sensor including a long 1ifetime ( b 2 years), excellent stability and reproducibility (ca. 1 mV), fast response time (`30 s), wide pH working range (pH 4.5±8), low detection limit (4610 75 M) and high thermal stability(up to 80 C).

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