Thin layer coulometric determination of nitrate in fresh waters
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 (TDM...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
Elsevier
2012
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| Online Access: | http://hdl.handle.net/20.500.11937/26104 |
| Summary: | 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 10-100µM with a precision of 2.3% relative standard deviation (RSD), limit of detection of 1.1µM and relative accuracy of 4.4% compared to a certified reference material (CRM) Lake sample. |
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