有色可溶性有机物（CDOM，Colored dissolved organic matter），又称作可溶性有机发色团，或者粘质胶性溶解物。它是水中溶解的有机物的一种光学上可测量的成分。

CDOM通常出现在水环境中，主要由腐烂物质所释放的单宁酸所引起。CDOM在蓝色到紫外的短波波段有强烈的吸收光谱，而纯水在红色的长波波段有吸收，因此，不含或少含CDOM的水显示出蓝色。随着CDOM的增长，水体颜色逐渐过渡到绿色、黄绿色和褐色。

Colored dissolved organic matter (CDOM) is the optically measurable component of the dissolved organic matter in water. Also known as chromophoric dissolved organic matter, yellow substance, and gelbstoff, CDOM occurs naturally in aquatic environments primarily as a result of tannin-stained waters released from decaying detritus. CDOM most strongly absorbs short wavelength light ranging from blue to ultraviolet, whereas pure water absorbs longer wavelength red light. Therefore, non-turbid water with little or no CDOM appears blue. The color of water will range through green, yellow-green, and brown as CDOM increases.