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Study on Preparation, Performance and Application of Puncture Composite pH Sensor

Author: ZhouChangQiang
Tutor: DuBaoZhong
School: Xi'an University of Technology
Course: Applied Chemistry
Keywords: electro-chemistry modification carbonfiber CF/IrO_x acupuncture Ag/AgCl reference electrode supermicro-acupuncture devices Polyaniline
CLC: O657.1
Type: Master's thesis
Year: 2009
Downloads: 58
Quote: 0
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Abstract


pH is one of the most important physical and chemical parameters of solution and determination of pH value keeps great significance in many fields, such as chemistry, Environmental protection, food, biology, medical science and etc. At present, the main method is to use pH glass electrode for testing but there are several shortages of its own which leads it to be restricted in practical application, including easy to be broken, low mechanical strength, difficult to miniaturize, activation requirement before use, acid error of acidic solution and can not be used in solution with F-.In this case, the glass electrode is restricted in practical application Metal/metal oxide pH electrode, with the advantages of high mechanical strength wide pH response range and easy to miniaturize, It has become a hot topic to research in the field of PH measurement in recent years.In this respect, the author explored the method of preparing acupuncture composite pH sensor, that is,to prepare acupuncture Ag/AgCl reference electrode by electrolysis at the surface of the micro needle first and then to assemble and install with the electrochemical IrOx-pH electrode into an acupuncture composite pH senser.This paper establishes a new approach to prepare acupuncture Ag/AgCl reference electrode by electrolysis with the process of plating nickel on stainless steel first and then silver covers on nickel. The results show that it has such out standing features as good reproducibility and reversibility, short response time and small resistance. The new elect rodes worked stably and ideal test curves were obtained under high tem2 perature and high pressure,and could be used in electrochemical research under high temperature and high pressure.Two kinds of solid-state pH electrode, stainless steel/IrOx, Ag/IrOx, are prepared by using electrochemical methods at different electrolyte and matrix. The result shows that the electrode linear range of stainless steel/IrOx-pH is pH2-13, with slope of-71mV/pH and response time of 45s; electrode linear range of Ag/IrOx-pH is pH 2-12, with slope of-70mV/pH and response time of 50s.This paper reports the use of electrochemical methods to prepare CF/IrOx-pH electrode in iridium chloride electrolyte and carbon fiber matrix. By making polyaniline as electrolyte, CF /Polyaniline-pH electrode is prepared on carbon fiber matrix. The testing result shows that CF/IrOx-pH electrode:linear range of pH2-12, the slope of 53mV/pH, response time≤25s; linear range of pH2-12, the slope of 65mV/pH, response time≤25s.To determine pH value of solid and semi-solid’s surface and internal and paste directly by using the author’s self developed composite pH electrode set up a new method for pH determination without breakage in situ. This method is simple, rapid, accurate, and has a broad application prospect for promotion.

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CLC: > Mathematical sciences and chemical > Chemistry > Analytical Chemistry > Instrument analysis ( physics and physical chemistry ) > Electrochemical analysis
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