| Title: | Molecular level characterization of the biolability of rainwater dissolved organic matter |
| Author(s): | Bao H; Qiao J; Huang D; Niggemann J; Yi Y; Zhao W; Ni S; Dittmar T; Kao SJ; |
| Address: | "State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China. Electronic address: baohy@xmu.edu.cn. School of Oceanography, Shanghai JiaoTong University, Shanghai, China. Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China; Observation and Research Station of Island and Coastal Ecosystem in the Western Taiwan Strait, Ministry of Natural Resources, Xiamen 361005, China. Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany. Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China; Department of Ocean Science and the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, China. State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China. Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany; Helmholtz Institute for Functional Marine Biodiversity (HIFMB) at the University of Oldenburg, Oldenburg, Germany. State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan, China" |
| DOI: | 10.1016/j.scitotenv.2022.160709 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "The atmospheric wet deposition has been recognized as a significant allochthonous source of dissolved organic carbon (DOC) to the ocean. However, few studies have examined the biolability of rainwater dissolved organic matter (DOM) at the molecular level. Rainwater samples were collected and incubated with ambient microbes. DOC, UV-vis spectroscopy, formic acid (FA), acetic acid (AA), and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICRMS) were applied. Approximately 50 +/- 16 % of rainwater DOC and ~90 % of FA and AA were bioconsumed within 28 days. The contribution of FA and AA to the total BDOC was ~30 %, which was the largest known biolabile fraction in rainwater DOC. In contrast, only approximately 15 % of formulae identified by FT-ICRMS were consumed, which were characterized by higher saturation, higher heteroatom content and lower modified aromaticity. Among the major high molecular weight secondary organic carbon (HWW-SOC)-like compounds, organosulfate contained the largest fraction of consumed formulae, while biogenic volatile organic-derived CHO compounds had the lowest. Our study for the first time provided both quantitative and qualitative understanding of the bioavailability of rainwater DOM, which is essential for understanding their effects on the biogeochemical cycles and the environmental health in the receiving waters" |
| Keywords: | *Dissolved Organic Matter Mass Spectrometry *Carbon/analysis Bioavailability Dissolved organic matter Ft-icrms Organic acid Rainwater; |
| Notes: | "MedlineBao, Hongyan Qiao, Jing Huang, Dekun Niggemann, Jutta Yi, Yuanbi Zhao, Weiqiang Ni, Silin Dittmar, Thorsten Kao, Shuh-Ji eng Netherlands 2022/12/10 Sci Total Environ. 2023 Mar 1; 862:160709. doi: 10.1016/j.scitotenv.2022.160709. Epub 2022 Dec 6" |
