ABSTRACT
Chromophoric dissolved organic matter (CDOM) is the term that is most commonly used to describe compounds dissolved in natural waters that absorb ultraviolet or short-wavelength visible light energy. Other terms in past and present use include gelbstoff (Kalle, 1938), gilvin (Kirk, 1994), and yellow substance. These terms refer to the fact that natural waters with high CDOM concentration are yellow to brown in color due to absorption of blue and green light. For the purposes of optical
5.1 Introduction ............................................................................................................................ 79 5.2 Sample Collection and Preparation ........................................................................................ 81
5.2.1 Overview ..................................................................................................................... 81 5.2.2 Sample Filtration ........................................................................................................ 82 5.2.3 Sample Storage and Stability ...................................................................................... 82 5.2.4 Environmental Influences ........................................................................................... 83
5.3 Analysis by Spectrophotometric Methods .............................................................................. 83 5.3.1 Principles of Operation: Definitions ........................................................................... 83 5.3.2 Sample and Blank Preparation ...................................................................................84 5.3.3 Instrumentation ...........................................................................................................84 5.3.4 Data Processing and Quality Control .........................................................................86
