What does CDOM mean in UNCLASSIFIED

CDOM, or Colored Dissolved Organic Matter, is a component of natural waters that gives them their characteristic color. CDOM is composed of dissolved organic carbon (DOC) and nitrogen (DON) compounds, which are released into the water from decaying plants and animals. CDOM absorbs and scatters light, which can affect the penetration of sunlight into the water column and the visibility of underwater objects.

CDOM plays a significant role in aquatic ecosystems by influencing the availability of light, nutrients, and energy. It can regulate the growth of phytoplankton and bacteria, and provide a food source for zooplankton and other aquatic organisms. CDOM can also bind to pollutants and metals, reducing their bioavailability and toxicity.

CDOM is typically measured using spectrophotometry. A water sample is passed through a spectrophotometer, and the absorbance of light at specific wavelengths is measured. The absorbance spectrum of CDOM is characteristic of its composition and concentration.

CDOM concentrations are influenced by a variety of factors, including the type and amount of organic matter in the water, the water temperature, and the presence of sunlight. CDOM concentrations are typically higher in wetlands, lakes, and rivers than in oceans.

CDOM can have both beneficial and harmful effects on human health. On the one hand, CDOM can bind to pollutants and metals, reducing their bioavailability and toxicity. On the other hand, CDOM can also produce disinfection byproducts when it reacts with chlorine in drinking water treatment plants.