Abstract
The dissolved organic matter pool in a soft-water lake was fractionated into six molecular weight components using ultramembrane filtration. A statistical relationship was found between organic carbon concentrations and molecular weight ranges within individual size-fractions. In characterizing these fractions, high (> 100000-50000) and low (2000-0) molecular weight organic materials were found to be labile (about 50 % decomposed in 4 h), following exposure to UV-light, while intermediate sized fractions (50000-2000) were essentially refractory. Chelation-complexation capacity for inorganic iron (59Fe) by high and low molecular weight fractions was increased significantly following exposure to UV-light. Bacterial 14C-labelled extracellular products were found to decompose at different rates in comparison to 12C organic compounds in individual molecular weight fractions, following exposure to UV-light, suggesting they were qualitatively different from one another.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
