2 L of gases were measured from each chamber) and the exhaust
from the FTIR was fed back into the chamber. Before measurements,
the analyser was zero calibrated using pure dry nitrogen gas. After
the measurements, sample spectra were recorded and qualitative
and quantitative analyses were conducted with the use of Calcmet
Professional software with a library of reference spectra for 50
gases. Calcmet is Gasmet DX-4015 proprietary software and uses
modified classical least square method for analysis of data. The
concentrations of chemical compounds were expressed in ppm (v/
v) units and total elemental sulfur from treatment groups is
calculated as mg S/m3
. After finishing measurements from one
treatment, FTIR was flushed with dry nitrogen gas for 15 min before
taking measurements from the next treatment group.