| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1165804 | Analytica Chimica Acta | 2012 | 6 Pages |
A nitrate ion-selective electrode (ISE) employing a permeable tubular membrane impregnated with a conventional ISE cocktail has been used successfully in the coulometric analysis of nitrate in fresh waters. The liquid ISE membrane comprising a nitrate ionophore [tridodecylmethylammonium nitrate (TDMAN)], lipophilic electrolyte [tetradodecyl-ammoniumtetrakis(4-chlorophenyl)borate (ETH 500)] and plasticizer [bis(3-ethyl-hexyl)sebacate (DOS)] was supported on a porous polypropylene tube. Coulometric analysis with the tubular membrane ISE showed that nitrate could be detected in the range 10–100 μM with a precision of 2.3% relative standard deviation (RSD), limit of detection of 1.1 μM and relative accuracy of 4.4% compared to a certified reference material (CRM) Lake sample.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A tubular membrane nitrate ion-selective electrode is capable of the coulometric analysis of nitrate in lake water. ► Exhaustive nitrate electrolysis in an ion-selective coulometric sensor yielded a calibration free response. ► The coulometric nitrate ion-selective electrode possesses a comparable precision and accuracy to spectrophotometry.
