The analysis of spiked samples prepared by serial dilution in
pure air provided the calibration curves, including all steps of the
analytical procedure. Good linear correlations were found
(r
240.98). Table 4 lists the detection and quantification limits. The
detection limits ranged between 0.6 pg m3 for dimethyl disulfide
and 87 pg m3 for hydrogen sulfide, that corresponded to 0.4–
65 pg (or 0.2–23 ppqV) considering the sampled air volume. These
values were quite better-in three magnitude orders-than obtained
by silica gel as solid sorbent sampling and detection by mobile
mass spectrometer with atmospheric pressure chemical ionization
[20]. Similar improvement was achieved compared to the values
reported for samples collected by canisters and analyzed by GC–
MS [8]. Our values were similar than those using cryofocusing
sampling system coupled to a thermal desorption, analyzed by
GC–PFPD (pulsed flame photometric detector)