期刊
ANALYTICA CHIMICA ACTA
卷 744, 期 -, 页码 39-44出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2012.07.026
关键词
Ion selective electrode; Coulometry; Nutrients; Nitrate; Environmental analysis
资金
- Swiss National Science Foundation
- CSIRO, through the Flagship Cluster Sensors Systems for Analysis of Aquatic Environments
- Australian Research Council [DP0987851]
- Australian Research Council [DP0987851] Funding Source: Australian Research Council
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 mu M with a precision of 2.3% relative standard deviation (RSD), limit of detection of 1.1 mu M and relative accuracy of 4.4% compared to a certified reference material (CRM) Lake sample. (C) 2012 Elsevier B.V. All rights reserved.
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