Thermoanalytical investigations

Normally the size of the crucible is chosen according to the amount of sample to be studied. The type of thermoanalytical investigation is also important for the construction and form of the crucible (see special crucibles). 

In all thermoanalytical investigations it is very important how the substance is placed and positioned on the sample holder. This was illustrated in simultaneous TG-DTA measurements in connection with gas analytical investigations by Wiedemann42. The three profiles shown in Fig. 37 correspond to the water vapor pressures recorded with a mass spectrometer during thermal dehydration of fine-grained calcium... 

Thermoanalytical investigations of sedimented airborne particulates [EINAX and LUDWIG, 1991] confirm experimentally the chemometrically found interpretation that aluminum can serve as an indicator element for lignite combustion. Thermogravimetric analysis of mixed samples of sedimented dusts detect a loss of mass at a temperature of 714°C this can be interpreted as dehydration of aluminosilicates. This loss of mass exhibits a well defined summer minimum and a strong winter maximum. These findings also correspond to the results from factor analysis (see Section 7.2.1.2.4). 

PLS modeling is a very powerful chemometric tool for detection and quantification of the relationships between emission and their impact on the environment. The chemometric solution could be confirmed by independent thermoanalytical investigations. 

Foldvari, M., and P. Kovacs-Palffy. 2005. Thermoanalytical investigation of mono- and bivalent interlayer cations in montmorillonite (in Hungarian language). Annu. Rep. Hungarian Geol. Surv. 167-176. 

Bihari-Varga, M., Biro, T., Thermoanalytical Investigations on the Age-Related Changes in Articular Cartilage, Meniscus and Tendon, Geron-tologia (1971) 17,2. 

The blue pigment used by the ancient Egyptians in their paintings and statuary has been the subject of modern thermoanalytical investigations by Bayer and Wiedemann (73-75). This blue pigment, called Egyptian blue. 

The calculated results were compared with experimental thermoanalytical investigations [234, 237]. Fig. 20 shows the thermogravimetric curve for the NCP200-derived ceramic. 

With regard to solid Tel2 there is only one description of the preparation which starts from the elements. In the course of a thermoanalytical investigation of the Te—I system this material was shown to consist of more than one phase. Commercial Telj was used for a spectroscopic study of the corresponding vapour... 

In contrast to the phase diagram given in Fig. 3 the system has been reported to be simple eutectic , and eutectic with regions of solid solutions , respectively. It may be noted that thermoanalytical investigations involving cooling from the melt do not provide conditions of thermodynamic equilibrium and furthermore... 

---