COMBUSTION CALORIMETRY ON SAMPLES OF MASS ABOUT 7 MG OF SUBSTANCES CONTAINING BROMINE WITH A CRMT ROCKING-BOMB CALORIMETER - APPLICATION TOTHE STUDY OF P-BROMOBENZOIC ACID

Wishing to extend its possibilities, we have used a CRMT rocking calor imeter associated with a microbomb to determine the enthalpy of combus tion of a sample of low mass (about 7 mg) of a substance containing br omine. p-Bromobenzoic acid, p-BrC6H4COOH, a candidate as reference mat erial for combustion calorimetry of substances containing bromine, has been investigated. The value of -(3090.1 +/- 1.3) kJ . mol(-1) for it s molar enthalpy of combustion obtained with this apparatus is in very good agreement with the two literature values obtained by classical r otating-bomb combustion calorimetry (m approximate to 1 g for each com bustion). (C) 1996 Academic Press Limited