부산대학교 도서관

Normally buret and pH-meter are used in the acid-base titration. After each addition of titrant, the volume added and the corresponding pH reading are recorded. At the end of the titration, the titration curve is then plotted point by point manually or through computer, which is tedious and time-consuming. A differentiator-assisted automatic acid-base titration system is presented in this paper. Simply by use of a peristaltic pump, pH-meter and strip-chart recorder, the titration can proceed automatically and the titration curve can be recorded immediately. Furthermore, in couple with two simple Op Amp circuits: differentiator and low-pass filter, the first-derivative titration curve can be obtained simultaneously. This automatic titration system was applied for the determination of Na_2CO_3 in a reference material. The result is in good agreement with the certified value and the precision is also excellent.