EXPLANATION
The absorbance of liquids and the absorptivity of liquids and solids at specified wavelengths in the ultraviolet region (220 to 400 nm) are useful in characterizing petroleum products. Examples of the application of this test method are the determination of the absorbance of white mineral oil, the absorptivity of refined petroleum wax, and the absorptivity of USP petrolatum.
TEST SUMMARY
The UV absorbance of a liquid is determined by measuring the absorption spectrum of the undiluted liquid in a cell of known path length under specified conditions. The UV absorptivity of a solid or a liquid is determined by measuring the absorbance, at specified wavelengths, of a solution of the liquid or solid at known concentration in a cell of known path length.
TEST PRECISION
The bias for this test method has not been determined.