Investigations on Polyaniline Film Modified Tungsten Filament as Composite Micro Needle-Concentric pH Sensor and Its Applications to the Fruit Internal pH Detection

Abstract

Abstract: A tungsten filament electrode modified with polyaniline by electro-polymerization was prepared to work as pH-sensitive electrode.A plastics needle filled with Ag/Agcl redox system was used as rettrence electrode.A micro needleconcentric pH sensor was constructed by inseFting the polyaniline-modified tungsten filament electrode in the needle reference electrode obtained above.The sensor exhibited a linear response in the range 2~12 pH.with a Nernst response slope (55mV/pH) and a response time of less than 1 min .The results obtained from the sensor were in good agreement with those from the glass pH electrode.The sensor has been successfully employed to determine pH in micro region of fruit.

Key words: , Polyaniline Needle-concentric pH sensor Fruit detection；

WANG Chao-Jin, LI Yun-Feng, YING Tai-Lin. Investigations on Polyaniline Film Modified Tungsten Filament as Composite Micro Needle-Concentric pH Sensor and Its Applications to the Fruit Internal pH Detection[J]. FOOD SCIENCE, 2000, 21(10): 48-50.

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Investigations on Polyaniline Film Modified Tungsten Filament as Composite Micro Needle-Concentric pH Sensor and Its Applications to the Fruit Internal pH Detection

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