This experiment was a drilled solid sample experiment, designated GB1.
It revealed the continued presence of products of the derivatization
reagent, N-methyl-N-tert-butyldimethylsilyl-trifluoroacetamide
(MTBSTFA), adsorbed onto the sample. For estimation of abundances of
volatile compounds detected in EGA, the background was subtracted as
a constant value, either at the start or end of the run or before
major peaks. An exception to this was CO2, which was modeled with a
downward-trending background throughout the run. Uncertainties in
abundances, deriving from statistical noise, background subtraction,
calibration factors, assumptions regarding ionization cross-sections
for the relevant compounds, and isobaric interferences, are estimated
at 10-20% of the values.