Compositional changes of dissolved organic carbon during its dynamic desorption from hyporheic zone sediments

Zhou, Chenxin1; Liu, Yunde1; Liu, Chongxuan2; Liu, Yuanyuan3; Tfaily, Malak M.4,5

2019-03-25

10.1016/j.scitotenv.2018.12.189

SCIENCE OF THE TOTAL ENVIRONMENT   影响因子和分区

0048-9697

1879-1026

Dissolved organic matter (DOM) is an important driver for biogeochemical reactions that affect microbial community function, and regulate changes in porewater chemical composition and redox properties in the environment. This study investigated the variation in DOM molecular composition during the detachment of organic matter (OM) from hyporheic zone (HZ) sediments using Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR-MS). Diffusive mass transfer and microbial degradation were the two primary processes controlling the rate of OM release and molecular composition changes during the detachment from sediments. The diffusive mass transfer process limited the rate of OM release from the sediments, but had negligible effect on the molecular signature of the released OM. Microbial degradation on the other hand preferentially consumed the protein- and lipid-like fractions of the DOM, characterized by lower nominal oxidation states of carbon (NOSC), lower molecular weight, and a higher saturation of chemical bonds. The results have strong implication to the organic carbon dynamics and related microbial activities and contaminant transformation in hyporheic zones, an important critical area in river systems. (C) 2018 Elsevier B.V. All rights reserved.

Dissolved organic matter (DOM) Molecular composition FTICR MS Hyporheic sediments

SCI ; EI

英语

通讯

Southern University of Science and Technology[G01296001]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000456175700003

ELSEVIER SCIENCE BV

20185106264491

Biodegradation ; Biogeochemistry ; Biological materials ; Bond strength (chemical) ; Dissolution ; Mass spectrometry ; Mass transfer ; Redox reactions ; Sediments ; Stream flow

Waterways:407.2 ; Biological Materials and Tissue Engineering:461.2 ; Biotechnology:461.8 ; Soil Mechanics and Foundations:483 ; Mass Transfer:641.3 ; Chemistry:801 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Organic Compounds:804.1

ENVIRONMENT/ECOLOGY

Web of Science

1.China Univ Geosci, Sch Environm Studies, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China
2.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
3.Nanjing Univ, Sch Earth Sci & Engn, Key Lab Surficial Geochem, Minist Educ, Nanjing 210023, Jiangsu, Peoples R China
4.Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richmond, WA 99354 USA
5.Univ Arizona, Dept Soil Water & Environm Sci, Tucosn, AZ 85721 USA

Zhou, Chenxin,Liu, Yunde,Liu, Chongxuan,et al. Compositional changes of dissolved organic carbon during its dynamic desorption from hyporheic zone sediments[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,658:16-23.

Zhou, Chenxin,Liu, Yunde,Liu, Chongxuan,Liu, Yuanyuan,&Tfaily, Malak M..(2019).Compositional changes of dissolved organic carbon during its dynamic desorption from hyporheic zone sediments.SCIENCE OF THE TOTAL ENVIRONMENT,658,16-23.

Zhou, Chenxin,et al."Compositional changes of dissolved organic carbon during its dynamic desorption from hyporheic zone sediments".SCIENCE OF THE TOTAL ENVIRONMENT 658(2019):16-23.