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Also known as chromophoric dissolved organic matter, [1] yellow substance, and gelbstoff, CDOM occurs naturally in aquatic environments and is a complex mixture of many hundreds to thousands of individual, unique organic matter molecules, which are primarily leached from decaying detritus and organic matter. [2]
Darker colored water can be seen in the right half of this experiment in a lake, with the giant Secchi disk appearing more brown in color due to higher dissolved organic matter concentrations. Colored dissolved organic matter (CDOM) absorbs light, making the water appear darker or tea-colored. Absorption by CDOM is one measure of water clarity.
Dissolved organic material is most commonly measured using either the Biochemical oxygen demand (BOD) test or the Chemical oxygen demand (COD) test. Organic constituents are significant in river chemistry for the effect that they have on dissolved oxygen concentration and for the impact that individual organic species may have directly on ...
Download as PDF; Printable version; ... Colored dissolved organic matter; ... Particulate organic matter; Particulate pollution;
Download as PDF; Printable version; In other projects ... Color of water; Colored dissolved organic matter; D. Degas conductivity; Deuterium-depleted water; DGH ...
Aquatic organic matter can be further divided into two components: (1) dissolved organic matter (DOM), measured as colored dissolved organic matter (CDOM) or dissolved organic carbon (DOC), and (2) particulate organic matter (POM). They are typically differentiated by that which can pass through a 0.45 micrometre filter (DOM), and that which ...
High concentrations of dissolved lime give the water of Havasu Falls a cyan color. Dissolved and particulate material in water can cause it to be appear more green, tan, brown, or red. For instance, dissolved organic compounds called tannins can result in dark brown colors, or algae floating in the water (particles) can impart a green color. [11]
The resulting mixture can increase the content of dissolved organic matter (DOM) and total organic carbon (TOC) in soil. [35] Lignite (brown coal) may also be oxidized to produce humic substances, reversing the natural process of coal formation under anoxic and reducing conditions. This form of "mineral-derived fulvic acid" is widely used in ...