( Hunan Metallurgy, No. 2, (1988) 59)
H. Liu, G. Zhu, J. Li and X. Liu
Department of Chemistry, Central South University of Technology, Changsha, P. R. China
A Z-80II single board microcomputer was used to monitor the potential of a pH electrode and control a needle valve. The titrant delivery rate was adjusted automatically in the titration process by changing the on-off time ratio of the valve. Acid-base titration was demonstrated in this system.