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Exothermic effects in soils during thermal analysis

¹ Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, D-30655 Hannover, Germany, and ² Institut für Mineralogie und Geochemie, Universität Karlsruhe, Kaiserstr. 12, D-76131 Karlsruhe, Germany

^* E-mail: smykatz{at}bio-geo.uni-karlsruhe.de

(Received 2 April 2002; revised 9 July 2002)

This paper addresses the application of thermal analytical methods (DTA/DSC/TG/ MS) in soil investigations, especially the interrelation of exothermic effects and analytical or preparative parameters. For the superimposed decomposition/oxidation reactions of siderites, FeCO₃, the heating rate is shown to have a decisive influence because low heating rates tend to suppress the endothermic effect. In mixtures of small amounts of organic matter (glucose and starch) with talc, the phyllosilicate acts as a catalyst by influencing the intensity of combustion of the organic matter.

KEYWORDS: exothermic, thermal analysis, soils, siderite