Dl. Mactaggart et al., GENERATION AND EVALUATION OF TEST GAS-MIXTURES FOR THE GAS-PHASE SULFUR INTERCOMPARISON EXPERIMENT, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 102(D13), 1997, pp. 16237-16245
The automated sulfur gas dilution system (ASGDS) was used during the G
as-Phase Sulfur Intercomparison Experiment (GASIE) to generate and ana
lyze test gas mixtures containing pptv levels of SO2 in the presence o
f various suites of potential measurement interferent gases. These tes
t gas mixtures were provided in a 100 standard liters per minute air m
atrix manifold, allowing simultaneous sampling by all seven intercompa
rison participants. The test gas mixtures were homogeneous within the
90-min test periods of the synthetic air phases of GASIE, allowing rig
orous intercomparison of any two or more data points obtained during a
given test period. A number of delivered SO2 concentrations were succ
essfully replicated throughout the experiment, permitting the collecti
on of a sufficient amount of data for statistical evaluation, The SO2
concentrations measured by the ASGDS quality control instrumentation a
greed with values obtained by the intercomparison participants but wer
e different from the set point values.