Characterization of fulvic acid fractions of dissolved organic matter during ice-out in a hyper-eutrophic, coastal pond in Antarctica

Dissolved humic material (HDOM) is ubiquitous to all natural waters and its source material influences its chemical structure, reactivity, and bioavailability. While terrestrially derived HDOM reference materials distributed by the International Humic Substances Society (IHSS) have been readily avai...

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Bibliographic Details
Published in:Environmental Research Letters
Main Authors: Kaelin M Cawley, Diane M McKnight, Penney Miller, Rose Cory, Ryan L Fimmen, Jennifer Guerard, Markus Dieser, Christopher Jaros, Yu-Ping Chin, Christine Foreman
Format: Article in Journal/Newspaper
Language:English
Published: IOP Publishing 2013
Subjects:
fulvic acid
Pony Lake
XAD-8
PLFA
fluorescence
NMR
Environmental technology. Sanitary engineering
TD1-1066
Environmental sciences
GE1-350
Science
Q
Physics
QC1-999
Ross Island
Antarc*
Antarctica
Online Access:https://doi.org/10.1088/1748-9326/8/4/045015
https://doaj.org/article/63b71d3798af488faa289e72b329b62f
Description
Summary:Dissolved humic material (HDOM) is ubiquitous to all natural waters and its source material influences its chemical structure, reactivity, and bioavailability. While terrestrially derived HDOM reference materials distributed by the International Humic Substances Society (IHSS) have been readily available to engineering and scientific communities, a microbially derived reference HDOM was not, despite the well-characterized differences in the chemistry and reactivity of HDOM derived from terrestrial versus microbial sources. To address this gap, we collected a microbial reference fulvic acid from Pony Lake (PLFA) for distribution through the IHSS. Pony Lake is a saline coastal pond on Ross Island, Antarctica, where the landscape is devoid of terrestrial plants. Sample collection occurred over a 17-day period in the summer season at Pony Lake. During this time, the dissolved organic carbon (DOC) concentrations increased nearly two-fold, and the fulvic acid fraction (collected using the XAD-8 method) accounted for 14.6% of the DOC. During the re-concentration and desalting procedures we isolated two other chemically distinct fulvic acid fractions: (1) PLFA-2, which was high in carbohydrates and (2) PLFA-CER, which was high in nitrogen. The chemical characteristics (elemental analysis, optical characterization with UV–vis and fluorescence spectroscopy, and ^13 C NMR spectroscopy) of the three fulvic acid fractions helped to explain their behavior during isolation.

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