Accompanying materials for the publication: "Identifying and quantifying geogenic organic carbon in soils – the case of graphite" - TGA thermograms

Abstract

20–40 mg of sample material was placed in an Al2O3 crucible and heated under a constant heating program from ambient to 1100 C with a ramp of 20 C min-1. First analyses were conducted under an oxygen-rich atmosphere, with an inflow of 250mL O2 min-1 and 250mLN2 min-1. Additional tests were done under anoxic conditions whereby the oxygen inflow was cut 100 off between 500 and 850 C. The oxygen inflow was restored and the heating program continued until 1100 C. Measured sample mass data are fitted with the spline function over the temperature, with steps of 1 C, via the Proteus Thermal Analysis software (NETZSCH, Hanau, Germany).