Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 741, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.140203
Keywords
Suspended particulate matter (SPM); Phosphorus forms; Solution phosphorus-31 nuclear magnetic resonance (P-31 NMR); Mobile phosphorus; Organic phosphorus
Categories
Funding
- State Major Project for Water Pollution Control and Management [2017ZX07603-005]
- National Natural Science Foundation of China [41977363]
- 135 Project of NIGLAS [NIGLAS2018GH05]
- CAS Interdisciplinary Innovation Team [JCTD-2018-16]
- Key Research Program of Frontier Sciences, CAS [ZDBS-LY-DQC018]
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Particulate phosphorus (P) dominates the total P (TP) content in lacustrine water columns and is a primary source of dissolved P in turbid eutrophic shallow lakes. However, the spatiotemporal variability of P compositions in suspended particulate matter (SPM) remains poorly understood. In this study, we applied chemical extraction and solution P-31 nuclear magnetic resonance (P-31 NMR) to assess the seasonal variations of SPM P compositions from a shallow turbid lake (Lake Chaohu, China) and its main river tributaries. P fractionation analysis indicated that mobile P (the sum of labile-P, iron-bound P, and organic P) accounted for N60% of the TP in SPM and showed high spatiotemporal variability throughout the year-long field investigation. In most seasons, riverine SPM (in urban rivers or rivers with high flow) contained a higher mobile P content than that of the lake and was therefore a dominant source of lacustrine mobile particulate P. Solution P-31 NMR identified five types of P compounds in SPM, with highest contributions from orthophosphate. Organic P components and concentrations showed high seasonal variability, and elevated p values occurred during the summer algal bloom. The correlation analysis between organic and inorganic P fractions inferred the possible degradation of organic P into reactive inorganic components of SPM. Consequently, biological or chemical processes would further transform the labile inorganic P into soluble reactive phosphorus, which is readily utilized by lacustrine algae. Our results suggest that the labile forms of P in SPM were highly dynamic and significantly contributed to the eutrophication of the turbid shallow lake. (c) 2020 Elsevier B.V. All rights reserved.
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