# Interpreting FTIR spectrum

• A
I collected FTIR spectrum (using an ATR stage) on a sample and a standard and noticed the following: (1) all the peaks in the spectrum matched, and (2) the standard had several peaks that absorbed more light than the sample (see 2nd page on attachment). Does this mean that the sample is not as pure as the standard (i.e. an IR inactive salt is mixed with the sample).

#### Attachments

• Chondroitin Sulfate FTIR.pdf
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