Absorption Spectomatry

Absorption spectroscopy refers to spectroscopic analysis that measure the absorption of radiation, in the form of frequency or wavelength, due to its interaction with the sample.  The intensity of the absorption varies as a function of frequency, and this variation is known as the absorption spectrum. The frequencies where absorption lines occur depend on electronic and molecular structure of the sample. The frequencies will also depend on the interactions between molecules in the sample, the crystal structure in solids, and on several environmental factors, such as temperature and pressure. Absorption spectroscopy is employed in the form of analytical tests to determine the presence of a particular substance in a sample and to quantify the amount of the substance present.  Ultraviolet and infrared spectrometry are common in analytical applications.

The following are ASTM methods for Absorption: