Fluorescence measures the inherent optical properties of dissolved substances in water and provides a wealth of information. Analysis of these substances can be used to assess environmental processing of dissolved organic matter (DOM), and also help distinguish sources of water and contaminants. The USGS Organic Matter Research Laboratory in Sacramento, CA, provides a range of analytical services including dissolved organic carbon concentration, and the optical properties of dissolved organic matter (DOM) in water. USGS scientists working with the OMRL have developed proxy models relating fluorescence measurements to a wide spectrum of constituents of concern including PFAS, oil/gas, mercury, and wildfire materials in both surface water and groundwater. These data can also be used to identify which optical instruments are likely to be most suitable for in situ monitoring for specific basins or sites, or if none are available, to develop a novel sensor for the cooperators’ needs.
