Polycyclic organic matter. A class of chemical compounds; organic, multiring compounds which include polycyclic aromatic hydrocarbons and heterocyclic compounds containing nitrogen, oxygen, and sulfur.
Abbreviation for Particulate Organic Matter. This is usually split into large (or sinking) POM and small (or suspended) POM. Large POM is typically greater than 50 m in diameter, sinks at rates around 100 m/day, and is usually sampled with sediment traps. It consists mainly of marine snow, zooplankton fecal pellets and intact organisms. Small POM is typically between about 1 and 50 m in diameter, sinks very slowly (if at all), and is sampled by filtering sea water. See Najjar (1991).
Polycyclic Organic Matter. A class of air toxics defined in the US Clean Air Act as compounds with more than one benzene ring and a boiling point of 100°C and higher. Includes practically all of diesel PAH material.