Perkin-Elmer MultiScope System, User Reference, Page: 120 / 142

120 . MultiScope System Microscope User's Reference
Figure 41 shows the spectra used to identify another paper contaminant. At the top
is the spectrum of the contaminated paper. Below it, there is a spectrum of a
cellulose fiber such as would be found in uncontaminated paper. The difference
between the two spectra (bottom spectrum) corresponded to carbonate anion
(CO
3
2-
); the contaminant was probably either MgCO
3
or CaCO
3
.
Figure 41 Identifying a Contaminant.
Top: Spectrum of Contaminated Paper.
Middle: Spectrum of Cellulose Fiber.
Bottom: Difference Spectrum Obtained by Subtracting the two Collected
with an MultiScope System Microscope and a Spectrum RX with a
narrow-band MCT detector.