A spectrum recorded from material of known identity, which a sample spectrum is compared against. An identity conclusion on a certificate from this laboratory is that comparison: the sample is confirmed against reference spectra using the techniques that suit the molecule, rather than by weighing the molecule.
A spectral match is a statement about consistency with the named expected compound. It cannot rule out a compound nobody asked about, which is why the expected identity is settled at scope review.
Measurement of the small frequency shifts in light scattered by a sample, which report on the same molecular vibrations infrared absorption does but under different selection rules.
Separation of components by how fast they migrate through a narrow buffer-filled capillary under an electric field, with ultraviolet detection at the far end, written CE-UV.
Measurement of absorbance across ultraviolet and visible wavelengths, giving the shape of a compound’s absorbance rather than a single reading at one wavelength.
The chemist-led review of a request before acceptance, which settles method fit, required quantity, matrix workability, and what the result will and will not support.
About identity confirmation
The spectroscopic techniques an identity conclusion is built from, and what each of them can settle.
