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A novel PARAFAC model for continental hot springs reveals unique dissolved organic carbon compositions
Organic Geochemistry ( IF 2.6 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.orggeochem.2019.103964 Joshua J. Nye , Everett L. Shock , Hilairy E. Hartnett
Organic Geochemistry ( IF 2.6 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.orggeochem.2019.103964 Joshua J. Nye , Everett L. Shock , Hilairy E. Hartnett
Abstract Dissolved organic carbon in hot springs reflects a range of sources and biogeochemical processes. We evaluated ~200 continental hot spring samples, with a range in pH and temperature, collected from the Tengchong hydrothermal region, Yunnan Province, China and Yellowstone National Park, Wyoming, USA. Dissolved organic carbon concentrations ranged from 16.7 µM to 2.97 mM. Acidic springs displayed the highest values and widest range in carbon concentration. Alkaline springs had a narrower range and lower average concentrations. Carbon composition was evaluated using ultraviolet absorption and 3D-fluorescence spectroscopy. Total fluorescence was correlated (p 97% of the total fluorescence. Our model includes three humic-like components, one protein-like component, and one novel component exclusively observed in highly acidic springs. The closest spectral match to the novel component is an acid-soluble lignin produced during high-temperature, acid digestion of wood pulp. Humic-like components were dominant in mid-pH springs (4
更新日期：2020-03-01
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