Attachments to SEA August '97 Report
Figures 1-6
Figure 1
The top trace shows the spectral file #01383 (from 8/7 @ 3:54am) over
the entire near- infrared spectral range. The lower trace is the library
reference spectrum for MTBE. MTBE is identified in the upper trace at a
concentration of 0.962ppm.
Figure 2.
This is a closer look a the same two spectra in the "fingerprint" range
centered near 1000 wavenumbers.
Figure 3.
The top trace above is from spectral file # 02505 (from 8/19 @ 12:49 p.m.)
in the 2600-3000 wavenumber range. The bottom trace is the library reference
spectrum for 2-methyl pentane in the same region. 2-methyl pentane is identified
in the top trace at a concentration of 0.113ppm.
Figure 4.
The top trace above is from spectral file #00754 (from 8/4 @ 10:07pm) in
the 2600-3000 wavenumber range. The lower trace is the library reference
spectrum for n-hexane in the same region. N-hexane is identified in the
upper trace at a concentration of 0.037ppm.
Figure 5.
The top trace above is from spectral file #00494 (from 8/31 @ 9:12am) in
the 2800-3000 wavenumber range. The middle trace is the library reference
spectrum for propane in the same region. The bottom trace is that for 3-methyl-1-butene.
Propane and 3-methyl-1-butene are both tentatively identified in the top
trace at concentrations of 0.117ppm and 0.218ppm respectively.
Figure 6.
The trace above is from spectral file 00201 (from 8/5 @ 7:41am on the South
Fenceline) in the 2800-3000 wavenumber range. No chemicals are identified
in this trace. There is a prominent peak centered around 2920 wn which
cannot be identified. This is one of many "unknown" compounds encountered
in the August data set.
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