Low-Cost Laboratory Data Acquisition System Based on the Z8 ENCORE!™ Microcontroller for pH Measurement

  • Ian Mitchelle S. De Vera Chemistry Department, School of Science and Engineering, Ateneo de Manila University, Quezon City
  • Edward T. Chainani Chemistry Department, School of Science and Engineering, Ateneo de Manila University, Quezon City
Keywords: pH sensor, microcontroller, pinch valve, ADC, auto-titration, glass electrode

Abstract

A pH measurement-auto-titration data acquisition system based on the Z8 Encore!™ Z8F6401 Flash microcontroller was devised with a glass electrode acting as a pH sensor. The data acquisition system allows buffer calibration, pH measurement of samples and the option to perform an automated strong acid-strong base titration via a solenoid pinch valve which actuates the flow of titrant. The results given by the pH measurement system were comparable to that of Sartorius® PB-20 pH meter using t-Test within the pH range 4.00 to 10.00. This can be attributed to the very linear response of the sigma-delta analog-to-digital converter (ADC) of the Z8F6401 to changes in potential. The auto-titration setup gave an accurate titrant volume delivery to the bromothymol blue endpoint (pH 6.2 to 7.6) for a strong acid-strong base titration.
Published
2006-11-01
How to Cite
De Vera, I. M. S., & Chainani, E. T. (2006). Low-Cost Laboratory Data Acquisition System Based on the Z8 ENCORE!™ Microcontroller for pH Measurement. KIMIKA, 22(2), 97-104. https://doi.org/10.26534/kimika.v22i2.97-104
Section
Research Articles