The methodology was applied to ambient air samples collected
at three different areas close to three landfills, which process high
amounts of urban and industrial wastes. The emissions contained
between 3 and 5 of the studied RSC compounds. The 4-carbon
compound (butyl mercaptan) was no detected in any sample, and
hydrogen sulfide and ethyl mercaptan were measured in all the
samples. Significant differences on RSCs values were observed, but
not between landfills. Fig. 3 shows the order of concentration RSCs
was hydrogen sulfide4ethyl mercaptan4carbon disulfide4
dimethyl sulfide4dimethyl disulfide. The mean concentration of
the most abundant compounds (hydrogen sulfide and ethyl mercaptan)
were 608 and 493 μg m3
, being the maximum concentrations
1950 and 3066 μg m3
, respectively. The rest of detected
RSC malodor compounds were present at considerably low
concentrations, being the differences up to 2-orders. Their average
values were 139 μg m3 (carbon disulfide), 41 μg m3 (dimethyl
disulfide), and 8 μg m3 (dimethyl sulfide), and the maximum
concentration values were 397 μg m3
, and 79 μg m3 and, 19 μ
g m3
, respectively.