Abstract
Preparation, characterization and applications of a novel long life ammonium ion membrane sensor based on zirconium titanium phosphate (ZTP) ion exchanger are described. The sensor displays a useful analytical response with excellent reproducibility, good precision, low detection limit and applicability over a wide range of ammonium ion concentration (1.2×10 −5–1.0 M). It also offers the advantages of significantly high thermal stability and resistivity towards redox agents and strong mineral acids. Using a gas diffusion dialyzer/flow-injection system, under optimized conditions, the ZTP membrane based sensor provides a throughput of 30 samples per hour with excellent selectivity for ammonium ion over most common cations. The average recovery of 7–140 μg ml −1 NH 3–N is 101.3±1.6% and the overall system has the advantages of simple construction, low cost, fast response time, reliability and automation feasibility.
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