Molecular weight-dependent spectral and metal binding properties of sediment dissolved organic matter from different origins

The Science of the Total Environment
Huacheng XuHelong Jiang

Abstract

The metal binding potential of dissolved organic matter (DOM) is highly related with its inherent properties such as molecular weight (MW). Here sediment DOMs with different origins, i.e., algae- and macrophyte-dominated sediment DOM (named as ASDOM and MSDOM, respectively), were size-fractionated into low MW (LMW-, <1 kDa) and high MW (HMW-, 1 kDa~0.45 μm) fractions, with the spectral and metal binding properties in different MW fractions exploring via total organic carbon, absorption spectroscopy, fluorescence parallel factor (PARAFAC) analysis, and Cu(II) titration techniques. The MSDOM contained more organic carbon, lower specific UV absorbance, lower fluorescence index, higher humification index, and lower biological index compared to the ASDOM. As for the MW-fractionated samples, the humic- and fulvic-like fluorophores were mainly distributed in the LMW-DOM, while the protein-like ones were located richly in the HMW-DOM. Thus, obvious MW- and origin-dependent heterogeneities in abundance and spectral properties were observed for sediment DOMs. One humic-like, one fulvic-like, and two protein-like fluorescent components were identified by PARAFAC analysis, with different components exhibiting different variable patterns in...Continue Reading

Citations

Dec 19, 2019·International Journal of Environmental Research and Public Health·Mei-Sheu ShiTing-Chien Chen
Sep 22, 2019·International Journal of Environmental Research and Public Health·Sheng-Hsien HsiehYi-Lung Yeh
Jan 13, 2021·Environmental Science and Pollution Research International·Xiang DingMi Zhou
Feb 8, 2021·The Science of the Total Environment·Yihua Xiao, Gunnhild Riise
Jan 31, 2021·International Journal of Environmental Research and Public Health·Cheng-Wen ChuangTing-Chien Chen
May 1, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Cristina Jiménez-HolgadoClaire Richard
Jun 13, 2021·Environmental Science and Pollution Research International·Haoyu RenYinghao Zhang
Sep 12, 2021·Environmental Science and Pollution Research International·Frédéric OuédraogoLaurence Denaix

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