| Main Title |
Environmental Photoprocesses Involving Natural Organic Matter. |
| Author |
Zepp, R. G. ;
|
| CORP Author |
Environmental Research Lab., Athens, GA. |
| Year Published |
1987 |
| Report Number |
EPA/600/D-87/194; |
| Stock Number |
PB87-199006 |
| Additional Subjects |
Photochemical reactions ;
Electromagnetic absorption ;
Light(Visible radiation) ;
Sunlight ;
Energy transfer ;
Free radicals ;
Humic acids ;
Reprints ;
Humic substances ;
Organic materials ;
Soil chemistry
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB87-199006 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
30p |
| Abstract |
Current research is reviewed on the photoreactions that occur when sunlight interacts with soil and aquatic organic matter. The primary focus is on photoprocesses involving humic substances. Investigations of the direct photoreactions of humic substances are discussed, with emphasis on the fading of the uv-visible and fluorescence spectra. The balance of the background paper deals with sunlight-induced reactions between humic substances and trace organic or metallic substrates. Recent studies have shown that these indirect photoreactions are mediated by electronically excited states or reactive intermediates derived therefrom that react with substrates by electronic energy transfer, by electron transfer, and/or by various free radical processes. Concepts and methods that are used to elucidate the nature and concentrations of these transient reactants are discussed, including approaches based on steady-state irradiations and techniques that employ laser flash photolysis. |
| Title Annotations |
Reprint: Environmental Photoprocesses Involving Natural Organic Matter, |
| PUB Date Free Form |
Jun 87 |
| Category Codes |
48E; 99D; 57H |
| NTIS Prices |
PC A03/MF A01 |
| Primary Description |
600/01 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
723227004 |
| Origin |
NTIS |
| Type |
CAT |
