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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