Photochemical dissolution of organic matter from resuspended sediments: Impact of source and diagenetic state on photorelease

Autor:	Robert J. Kieber, Stephen A. Skrabal, John R. Helms, Melissa W. Southwell, Ralph N. Mead, G. Brooks Avery, Donna A. Glinski
Rok vydání:	2014
Předmět:	chemistry.chemical_classification Provenance Chemistry chemistry.chemical_element Photochemistry Humus Diagenesis Sedimentary depositional environment Geochemistry and Petrology Environmental chemistry Dissolved organic carbon Sedimentary organic matter Organic matter Carbon
Zdroj:	Organic Geochemistry. 73:83-89
ISSN:	0146-6380
Popis:	Sediments exposed to simulated solar radiation release dissolved organic carbon (DOC). However, it is unclear how the provenance of sedimentary organic matter (OM) impacts this photorelease. In the first geographically extensive study of this kind, twenty three size fractionated, fine grained sediments ( FA ) indicated that terrestrially derived sediments exhibited relatively greater DOC photorelease. The long chain carbon preference index (CPI 24–34 ) indicated that diagenetically unaltered terrestrial OM photoreleased more DOC than diagenetically altered terrestrial OM. The short chain carbon preference index (CPI 14–22 ) demonstrated that sediments containing diagenetically altered planktonic or algal derived OM had a greater photorelease rate of DOC than fresh algal OM. This suggests that humic substances (humus and/or adsorbed humic and fulvic acids) play an important role in the photochemical dissolution of OC regardless of whether or not they are imported from upstream (i.e. terrestrial humics) or generated within the depositional or sedimentary environment (i.e. humification of algal dissolved OM).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::44b3f0f1f8208f64dc05b813d388362f https://doi.org/10.1016/j.orggeochem.2014.05.011 Zobrazit plný text záznamu Full Text from ScienceDirect