Journal
ENVIRONMENTAL POLLUTION
Volume 270, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.116221
Keywords
Dissolved organic matter; Arsenic; Complexation; Aqueous system
Categories
Funding
- National Natural Science Foundation of China of China [31700663, 21707126]
- China Postdoctoral Science Foundation [2018M643796XB, 2019T120866]
Ask authors/readers for more resources
The study found that different components of dissolved organic matter (DOM) exhibit varying binding capacities for arsenic, with humic substances showing the strongest affinity. In eutrophic water systems, polysaccharides may be the main DOM component binding arsenic. The presence of cationic bridge function is more likely to occur in the presence of humic substances.
Dissolved organic matter (DOM) and dissolved ions are two integral parameters to affect the environmental fate of As in different ways. Numerous studies chose surrogate of DOM, humic substances (HSs), to investigate the As complexation behavior. However, microbial secretion (protein and polysaccharide) was also considered for a great proportion in surface aquatic system, and its effect was still not fully understood. The present research distinguished the As complexation behavior with different DOM components (HSs, protein, polysaccharide and synthetic organic matter) in natural and simulated water samples. The results indicated that different DOM components exhibited various binding capacities for As. HSs showed the strongest affinity for As, followed by long-chain compounds (polysaccharide and synthetic organic matter) and proteins. In water source, HSs were probably the primary parameter for As complexation. In eutrophic water system, however, polysaccharide maybe the main DOM component to bind As. Cationic bridge function was prone to occur in the presence of HSs, but not observed in the presence of protein. PO43- competed for binding sites with As, consequently decreasing the As complexation with all the DOM components. The research implied that a comprehensive and meticulous analyses of DOM fractions and coexist ions are the prerequisite to understanding the behavior of As (or other pollutants) in different natural aquatic systems. (C) 2020 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available