期刊
ELECTROANALYSIS
卷 25, 期 12, 页码 2579-2585出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201300400
关键词
Ion-selective electrodes; Nitrite; Nitrate; Polymeric membrane electrodes; Potentiometry
资金
- National Institutes of Health [EB-000784]
Cobalt(III) 5,10,15-tris(4-tert-butylphenyl) corrole was synthesized and incorporated into plasticized poly(vinyl chloride) membranes and studied as a neutral carrier ionophore via potentiometry. This cobalt(III) complex has binding affinity to nitrite, and the resulting membrane electrode yields reversible and Nernstian response toward nitrite. Enhanced nitrite selectivity is observed over other anions, including lipophilic anions such as thiocyanate and perchlorate when an appropriate amount of lipophilic cationic sites are added to the membrane phase. Detection limit to nitrite is ca. 5 mu M. Using tributylphosphate as the plasticizer with the cobalt(III) corrole species yields electrodes with enhanced nitrate selectivity.
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