Dear all,
We did a TGA analysis on a series of peat samples and we see a weight loss up to 4% between 800 and 1000 degrees C. Does anyone have a suggestion which mineral/element could be responsible for this weight loss? Usually we measure a loss of weight of less than 1 percent in this temperature range.
Settings: ramping at 1degree/minute, stops at 105, 450, 550 and 800 degrees until stable weight, running under an air flow.
Best regards,
Gerlinde Roskam
It is from oxidation of volatile compounds, possibly sulphur :)
I don't know the sulphur content of the samples yet, but I expect that most of the sulphur will be present in the form of organic-S or possibly pyrite. The conditions under which peat is formed, make the presence of sulphate minerals (that decompose at high temperatures) less likely. Some samples do show some weight loss around 650C (which could indicate pyrite), but far less than the gradual weight loss that occurs between 800 and 1000 C.
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