Characterization of All Solid State Hydrogen Ion Selective Electrode Based on PVC-SR Hybrid MembranesReportar como inadecuado




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1

Department of Chemistry, Pusan National University, Pusan 609-735, S. Korea

2

Department of Medical Engineering, Pusan National University, Pusan 609-735, S. Korea





*

Author to whom correspondence should be addressed.



Abstract Hydrogen ion selective membranes formulated with 3140 RTV silicone rubber SR in PVC were studied to extend the life time of solid state ion sensors through improved membrane adhesion. All solid state hydrogen ion selective electrodes were prepared by incorporation of tridodecyl amine TDDA as an ionophore, potassium tetrakis3.5-bisp-chlorophenylborate KTpClPB as a lipophilic additive, bis2-ethylhexyladipate DOA as a plasticizer. Their linear dynamic range was pH 2.0-11.0 and showed the near Nernstian slope of 55.1±0.2 mV-pH r=0.999. The ifluences from alkali and alkaline earth metal ions were studied for the response of the final ISE membrane composition. Impedance spectroscopic data showed that the resistance was increased by increasing SR content in PVC. Brewster Angle Microscopy BAM image showed clear differences according to the SR compositions in PVC. Life time of the all solid state membrane electrode was extended to about 2 months by preparing the membrane with PVC and SR. The standard reference material from NIST 2181 HEPES Free acid and 2182 NaHEPESate was tested for the ISE and it gave good result. View Full-Text

Keywords: Hydrogen ion sensor; Polymer membrane; All solid state ISE; BAM; Impedance spectroscopy Hydrogen ion sensor; Polymer membrane; All solid state ISE; BAM; Impedance spectroscopy





Autor: Ming-Hua Piao 1, Jang-Hee Yoon 1, Gerok Jeon 2 and Yoon-Bo Shim 1,*

Fuente: http://mdpi.com/



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