Thermochromatography for evolved gas analysis of apatite materials

Evolved gas analyses of model inorganic compounds and apatites are described. The measurements were performed on a system comprising a 'thermochromatograph', with a low-volume thermal furnace, interfaced to a capillary gas chromatograph via a computer-controlled, pneumatic sample inlet device in the temperature region 70-600 degrees C. The performance of this inherently simpler system is comparable to that of thermogravimetry but is superior in resolving possible reactions when similar materials are analysed. (C) 1998 Elsevier Science B.V. All rights reserved.