A duplicate RPD primarily evaluates:

A fiber spectrum with strong O-H and strong C-O bands but no amide bands is likely cellulosic.

If the blank response increases after running the highest standard, this suggests ________.

A band is at 720 cm^-1. Convert to µm (λ=10,000/ṽ). Round to 2 decimals.

Using the same acid matrix for standards and samples reduces transport/excitation bias.

Acceptable dataset evidence includes: (Select all that apply)

If an unknown and a known have nearly identical spectra, you may still only claim a class association unless other evidence supports individuality.

For a polypropylene reference, which combination of spectral features is most expected?

Using mg CaCO₃/tab = [T] mg, compute mmol HCl/tab. (Report to 2 decimal places)

Give ONE reason FTIR alone may not uniquely identify a manufacturer/source of a common fiber type.