Data acquisition system for chemical kinetic
studies |
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Authors: | Yu-zhen Zhu Xin Zhou Xiang-sheng Zang |
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Affiliation: | 1. Department of Chemistry, East China University of Chemical Technology, Shanghai, China.;2. Materials Science Department , Shanghai Jiao Tong University, Shanghai, 200 030, China, |
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Abstract: | A microcomputer-interfaced data acquisition system for chemical
kinetics (interfacing with laboratory analogue instruments) has
been developed. Analogue signals from instruments used in kinetics
experiments are amplifed by a wide-range adjustable high-gain
operational amplifier and smoothed by an op-based filter, and then
digitized at rates of up to 104 samples per channel by an ADC
0816 digitizer. The ADC data transfer and manipulation routine
was written in Assembler code and in high-level language; the
graphics package and data treatment package is in Basic. For the
various sampling speeds, all of the program can be written using
Basic-Assembler or completely in Assembler if a high sampling
rate is needed. Several numerical treatment methods for chemical
kinetics have been utilized to smooth the data from experiments.The computer-interfaced system for second-order chemical kinetic
studies was applied to the determination of the rate constant of the
saponification of ethyl acetate at 35°C. For this specific problem,
an averaging treatment was used which can be called an interval
method. The use of this method avoids the diffcully of measuring
the starting time of the reaction. Two groups of experimental data
and results were used to evaluate the systems performance. All of the
results obtained are in agreement with the reference value. |
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