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자료유형
학술저널
저자정보
저널정보
한국환경분석학회 환경분석과 독성보건 한국환경분석학회지 제10권 제3호
발행연도
2007.1
수록면
175 - 179 (5page)

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The construction and performance characteristics of ion selective membrane electrodes for analysis of citrate ion (CIT) are described. The proposed sensors are based on the formation of the complex ion associated with bis(triphenylphosphoranyliden)ammonium chloride and trisodium citrate dihydrates as an ionophores on poly vinyl chloride membrane (PVC). Several selective membranes were prepared with distinct mediator solvents (with quite different polarities) and, in some cases, p-tert-octylphenol (TOP) as an additive. The latter was used for selectivity increase. The analysis system using the electrode showed a linear and stable potential response with the near-Nernstian slope of 51.0 mV per decade over a wide range of concentration to~10-5.07 M citrate with good reproducibility. The electrodes showed a fast response time of < 60 sec. and were used over a wide range of pH 3~7. The same membranes conducted as well to the best selectivity characteristics, assessed by the separated solutions method and for several chemical species, such as chloride, nitrate, ascorbate, glucose, fructose and sucrose. The selectivity coefficients indicated good selectivity for CIT over organic compounds and chloride ion. The proposed sensors are tested for the analysis of artificial blood serum, beer and soft drinks and the attained similar results with citrate in pure form. Standard deviation of these electrodes were ± 0.8 mV~± 4.4 mV and correlation to the existing methods of 0.9998 were achieved.

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