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Thin Layer Coulometric Determination of Nitrate in Fresh Waters

Manzar Sohail, Roland De Marco, Krystina Lamb, Eric Bakker

Anal Chim Acta. 2012 Sep 26;744:39-44.

PMID: 22935372

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number Product Name Structure CAS Number Price
AP13533590 Tridodecylmethylammonium nitrate Tridodecylmethylammonium nitrate 13533-59-0 Price
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