科研之友
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摘要
The SRC-100 type solution-reaction calorimeter was improved to a more precise and versatile isoperibol combustion-solution-reaction microcalorimeter. The energy equivalent of the calorimeter was calibrated to be C-calor = (987.63 +/- 0.61) J.K-1 by the electric calibration method. The standard massic energy of combustion of benzoic acid and succinic acid were determined by the developed isoperibol combustion-solution-reaction microcalorimeter as Delta U-c(m,B)theta(cr, T = 298.15 K) = -(26425.99 +/- 10.70) J.g(-1) and Delta U-c(m,S)theta(cr, T = 298.15 K) = -(12621.97 +/- 5.30) J.g(-1), respectively. The uncertainty of the measurement was less than 0.04% and the accuracy was higher than 0.05%.
