Effect of Borohydride Reduction and pH on the Optical Properties of Humic Substances
- Schendorf, Tara Marie
DOIAbstract
Despite decades of research, the structural basis for the optical properties of chromophoric dissolved organic matter (CDOM) and humic substances (HS) are still not clear. Through several analytical techniques, it is known that CDOM contains carbonyls (aromatic ketones, aldehydes, and quinones), carboxylic acids, and phenols. The charge-transfer model proposed to explain the optical properties of these materials assigns the short-wavelength absorption (<350 nm) and fluorescence emission to electron donors (phenols) and acceptors (carbonyls), while the long-wavelength absorption is attributed to charge-transfer interactions among these species. Because carbonyls are reducible species a method was developed to eliminate them and to investigat...
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