The Specific UV Absorbance (SUVA) calculation is typically performed for the purpose of determining disinfection by-product (DBP) formation potential.

SUVA is simply UV 254nm divided by the DOC of a water sample. This allows the aromatic biased UV 254nm measurement to be normalized over the overall organic load in the water. A characterization of the aromaticity of the water independent from the general level of organics in the water can then be obtained.

A high SUVA indicates that a large portion of the organics present in the water are aromatic. Since aromatic organics have a greater tendency to react with disinfectants to create DBPs, a high SUVA indicates there is a high potential for the formation of DBP’s.

For further details about measuring SUVA for regulatory purposes click here to link to EPA Method Method 415.3