Moving-Bomb Combustion Calorimetry in Oxygen

The energy produced in the calorimeter proper as a result of friction in the rotating mechanism and stirring of the calorimetric liquid by the rotation of the bomb may be substantial. Yet provided that this effect is constant, its contribution to the energy of the calorimetric process can be accurately subtracted. If the bomb is rotated during the calibration and the sample runs, and if the rotation is started and ended at the same instants of the respective main periods, then the energy 

Therefore, by using equation 7.64 it is possible to automatically include the energy of rotation in the calculation of Arcorr. As indicated in section 7.1, it is frequently observed that the temperature of the calorimeter proper during the initial and final periods is, to a good approximation, a linear function of time. In this case, the values of gj and gf in equation 7.64 are derived from a linear least squares fit to the experimental temperature-time data obtained during those periods. When significant departures from linearity are observed, T0Cj and Tx,f 

The corrections due to the bomb rotation can also be eliminated by using a dynamic calorimeter, in which the whole calorimeter is rotated and the rotation mechanism is outside the calorimeter proper. An example of such instrument is the aneroid calorimeter developed by Adams, Carson, and Laye [77], shown in figure 7.9. 

The combustion of an organic fluorine compound in a bomb containing water (typically 10 cm3 for a bomb of 300 cm3 total volume) can be represented by the equation [61-63] 

Organochlorine or -bromine compounds are burned in the presence of aqueous solutions of arsenious oxide (AS2O3) or hydrazine hydrochloride (N2H4.2HCI). These solutions are effective in reducing the elemental chlorine or bromine formed to the chloride or bromide ions according to the reactions (X = Cl, Br) [61,62,64-66]  

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