Page:NIOSH Manual of Analytical Methods - 3800.pdf/10

ORGANIC AND INORGANIC GASES by FTIR Spectrometry: METHOD 3800, Issue 1, dated 15 March 2003 - Page 10 of 47

$-1$ Used in LOD calculations; averaged spectra from the quoted libraries; data available from the authors. $a$ Approximate Limit of Detection (LOD) for a 10 meter absorption pathlength. Typical values of the RSA, the quoted Analytical Regions, and the quoted reference spectral data were used to calculate the LOD as described in Appendix E, Equation E1.

$b$ The maximum ppm-m value available for the compound in the quoted reference spectrum source.

$c$ Maximum Squared Residual Area (RSA) in the specified Analytical Regions consistent with the quoted LOD values. See Appendix E, Section 1.

$d$ See Reference 10. Average absorbance and accepted standard concentration values for the low-concentration pairs of spectra were used. Interferograms were truncated to 0.5 cm-1 resolution and triangular apodization was employed.

$g$ Data available from the authors.

$e,g$ From EPA reference spectra recorded at 100° C (Reference 10).

$e$ NIST Standard Reference Database #79 (Reference 9). The quoted maximum concentration for SO2 is based on linearity studies of 0.5 cm-1 resolution spectra with triangular apodization. Non-linear absorbance leads to errors of less than 10% at 1000 ppm-m. NIOSH Manual of Analytical Methods, Fourth Edition