Calibration of Combustion Calorimeters

The standard molar enthalpy of formation of 2-chlorodibenzo-p-dioxin

“…The correction for small deviations from certificate conditions was calculated according to Jessup's formula. (7) The uncertainty of o (as well as of D c u°and D sub H°m, see below) was calculated as 2t·s, where s is a standard deviation of the mean value, and t is a Student's coefficient for 0.05 significance level.…”

Enthalpies of combustion of 1,1,4,4-tetramethylcyclodecane and of 1,1,5,5-tetramethylcyclodecane in the liquid state

“…For the energy equivalent of the empty calorimeter, e(calor) (12), 139.726 J "1 was used. This figure pertains to the situation where the adjustment of the amount of water in the calorimeter, by weighing against fixed weights, would have been made under normalized atmospheric conditions, viz., the density of air is 1.200 g dm3.…”

“…The temperature of the isoperibol combustion bomb calorimeter (6)(7)(8)13) was measured with the platinum resistance thermometer and the Smith method No. 3 bridge described in ref 13. The calorimeter was calibrated with benzoic acid, National Bureau of Standards sample 39i, certified to have a specific internal energy of combustion of 26434 J g™1 under so-called certification conditions (12).…”

“…The jacket temperature was about 26.0 °C, with a stability of about ±0.001 °C. Variations were accounted for (12). The initial and the final rating period were 4 and 8 min, respectively.…”

Enthalpies of combustion and formation of α-d-glucoheptono-1,4-lactone and α,β-glucooctanoic-1,4-lactone

“…The calorimeter was calibrated with 12 experiments of combustion of benzoic acid (NIST SMR 39j). Due to the existence of a significantly high departure from the certification conditions in the micro-combustion calorimeter, it was necessary to use the combustion standard massic energy of benzoic acid, D c u = À (26,414 ± 3) J Á g À1 [14,15], and the Washburn corrections in order to determine the energy equivalent. The value obtained was e(calor) = (1.2775 ± 0.0004) kJ Á K À1 , where the uncertainty is the standard deviation of the mean.…”