Issue 4, 2007
From the journal:

New Journal of Chemistry

Improved nitrate sensing using ion selective electrodes based on urea–calixareneionophores

Benjamin Schazmann*a  and  Dermot Diamond*a  

* Corresponding authors

a Adaptive Sensors Group (ASG), National Centre for Sensor Research (NCSR), Dublin City University, Dublin 9, Ireland
E-mail: Dermot.Diamond@dcu.ie, Benjamin.Schazmann2@mail.dcu.ie
Fax: 00353 1 7007995
Tel: 00353 1 7005670

Abstract

Urea–calix[4]arenes 1 and 2 were synthesised and incorporated into ISE membranes for assessment as sensors for inorganic anions in water. 1 revealed a strong response to all anions following the Hofmeister selectivity order. For ISEs of 2, the response to a portion of the anion series was suppressed, increasing the margin of selectivity of nitrate over chloride, a common interferant of nitrate in fresh and marine water samples. The performance of ISEs containing 2 was compared to commercially available alkylammonium nitrate ion-exchange salts used for nitrate sensing. Our ISEs performed favourably in terms of sensitivity, linear range and LOD with an improved selectivity coefficient over chloride of log KNO3−Cl−pot of −3.4, an order of magnitude better than commercially available nitrate ISEs. The pre-conditioning of ISEs in non-primary chloride salt was essential for obtaining these results.

Graphical abstract: Improved nitrate sensing using ion selective electrodes based on urea–calixarene ionophores

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Article information

DOI
https://doi.org/10.1039/B702841P
Article type
Paper
Submitted
23 Feb 2007
Accepted
26 Feb 2007
First published
12 Mar 2007

New J. Chem., 2007,31, 587-592

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Improved nitrate sensing using ion selective electrodes based on urea–calixarene ionophores

B. Schazmann and D. Diamond, New J. Chem., 2007, 31, 587 DOI: 10.1039/B702841P

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