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Updated: Aug 22, 2025

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
Published on: March 6, 2014
Phosphorus speciation and sedimentary phosphorus release in an urban bay (Dachan Bay, China) impacted by multiple
Sheng Ke1, Chunliang Chen1, Peng Zhang2
1Analytical and Testing Centre, Guangdong Ocean University, Zhanjiang 524088, China.
Abstract:
Sedimentary phosphorus (P) release and retention are important in controlling P dynamics in coastal waters. Here, two sediment cores were analysed to understand the P speciation and sedimentary P release characteristics in Dachan Bay, Shenzhen, where was highly influenced by human activity. Total phosphorus (TP) concentrations, 52.3 to 1119 μg g-1, fluctuated greatly with depth. Four P binding forms were fractionated: iron-bound P (FeP), authigenic apatite (CaP), detrital P (De-P), and organic P (OP) with the following order of concentration: Fe-P > OP > De-P > Ca-P. The P pollution index (PPI) revealed the contamination of sediment with P in recent years. Additionally, the potentially mobile P pools and long-term P release in the sediments were estimated, and the results indicated that, sediment was an important potentially mobile P pools in the water column, especially in nearshore areas, which required the attention of management departments.
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