Investigations on Carbon Fiber pH Ultramicrosensor Modified by Polyaniline Film and Its Applications to the in vivo Detection on Brassica Stigmata

Abstract

Abstract: ApHultramicrosensor based on polyaniline film modified carbon fiber microcylinderelectrode in proposed.The film is introduced onto carbon fiber surface by electropolymerization of aniline, The sensor exhibits a linear response over the range 2-12.5 pH, with a near Nerstain response slope (60 mV/pH) at room remperature.The correlation coefficientis 0.9999.The average response time at the sensor is about 2 min.The selectivity coefficient obtained for lgK_H^{POt₊.Mⁿ⁺ are - l1.9, - 12.1, - l2.Oand -11.6 for K⁺, Na⁺, Li⁺ and Ca²⁺, respectively.The sensor was employed for measuring the pHof tap water, lake water and fresh urine.The results obtained from the sensor are in good agreement with those from the glass pHelectrode.The sensor has been used for in vivo detection of pHon surface microenvironment of Brassica stigmata and pollen grains with satisfactory results.}

Key words: Polyaniline, Modified microelectrode, pH ultramicrosensor, Stigmata, In vivo detection

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WAN Qi-Jin, ZHANG Xue-Ji, ZHANG Chun-Guang, ZHOU Xing-Yao. Investigations on Carbon Fiber pH Ultramicrosensor Modified by Polyaniline Film and Its Applications to the in vivo Detection on Brassica Stigmata[J]. Chem. J. Chinese Universities, 1997, 18(2): 226.

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Investigations on Carbon Fiber pH Ultramicrosensor Modified by Polyaniline Film and Its Applications to the in vivo Detection on Brassica Stigmata

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