Characteristics, distribution and ecological risk assessment of phosphorus in surface sediments from different ecosystems in Eastern China: A 31P-nuclear magnetic resonance study

[Display omitted] •ERI and P compounds in different ecosystems sediment were studied.•Two P compounds classes and five P compounds were detected by 31P-NMR•Ortho-P (83.3–97.6%) and mono-P (1.1–18.0%) were the dominant forms.•ERI in sites-river and estuary were higher than lake and wetland.•The Xm an...

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Published in:Ecological engineering 2015-02, Vol.75, p.264-271
Main Authors: Zhang, Wenqiang, Shan, Baoqing, Li, Jie, Tang, Wenzhong, Jin, Xin, Zhang, Hong, Ding, Yuekui, Wang, Yuanyue, Zhu, Xiaolei
Format: Article
Language:English
Subjects:
31P-NMR
Brackish
China
Ecosystems
ERI
Estuaries
Eutrophication
Phosphorus
Risk
Rivers
Sediment
Sediments
Sorption
Wetlands
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Summary:[Display omitted] •ERI and P compounds in different ecosystems sediment were studied.•Two P compounds classes and five P compounds were detected by 31P-NMR•Ortho-P (83.3–97.6%) and mono-P (1.1–18.0%) were the dominant forms.•ERI in sites-river and estuary were higher than lake and wetland.•The Xm and ERI values fitted a power function. Surface sediments in different ecosystems (lake, river, reservoir, estuary and wetland) in Eastern China were extracted with NaOH–EDTA, and the extracts were analyzed by 31P-NMR to reveal the phosphorus (P) species distribution. The P release risk was also assessed by sorption experiments. The river sediments accumulated significant amounts of P compared with other sediments. The organic phosphorus (Po) concentration in the estuarine sediment was lower than that in other sediments. Two P compounds classes (phon-P and mono-P) and five P compounds were detected in the sediments. Ortho-P (83.3–97.6%) was the dominant P compounds and mono-P (1.1–18.0%) were the dominant Po compounds classes, while smaller amounts of DNA-P (0–4.1%), pyro-P (0–4.0%) and lipid-P (0–0.8%) were found in the surface sediment. Poly-P and phon-P were detected only in site 11 (wetland), site 10 (wetland) and 11, respectively. The ERI values, as a measure of eutrophication risk, were different in the various sediments, being greater than 25% in sites 1 (river), 3 (estuary) and 4 (estuary), and with values of 26, 59 and 83%, respectively. The Xm and ERI values fitted a power function (RXm-ERI=0.89, p
ISSN:0925-8574
1872-6992
DOI:10.1016/j.ecoleng.2014.11.055