Flow-through pH-ISFET as detector in the determination of ammonia

S. Alegret, J. Alonso, J. Bartroli, M. del Valle, N. Jaffrezic-Renault, Y. Duvault-Herrera

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23 Citations (Scopus)


A simple flow-injection metod for the determination of ammonium ions in water, based on a flow-through pH-ISFET, is described. Ammonium is converted to ammonia, which diffuses through a microporous hydrophic membrane into an ammonium chloride recipient stream, forming a pH buffer which is monitored by the semiconductor detector. The linear working range extends from 0.1 to 10 mmol l -1 with a relative standard deviation of ca. 1% at the 0.7 mmol l -1 level. © 1990.
Original languageEnglish
Pages (from-to)53-58
JournalAnalytica Chimica Acta
Issue numberC
Publication statusPublished - 1 Jan 1990


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