Phosphorus sorption - Desorption behaviors in the sediments cultured with Hydrilla verticillata and Scripus triqueter as revealed by phosphorus fraction and dissolved organic matter
| Autor: | Yunchuan Long, Jing Hu, Chengbin Zhu, Xuejun Hu, Juan Jiang, Shao-Qi Zhou |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Geologic Sediments
Environmental Engineering Health Toxicology and Mutagenesis 0208 environmental biotechnology chemistry.chemical_element 02 engineering and technology Hydrocharitaceae 010501 environmental sciences complex mixtures 01 natural sciences Desorption Aquatic plant Dissolved organic carbon Environmental Chemistry Freundlich equation 0105 earth and related environmental sciences biology Phosphorus Public Health Environmental and Occupational Health Hydrilla Sediment Sorption General Medicine General Chemistry biology.organism_classification Pollution 020801 environmental engineering chemistry Environmental chemistry Adsorption |
| Zdroj: | Chemosphere. 271 |
| ISSN: | 1879-1298 |
| Popis: | The migration of sediment phosphorus (P) could be affected by the existence of aquatic plants. To explore the effects of aquatic plants on the P sorption-desorption behaviors in the sediments, sediment in Caohai wetland was collected and cultured with the submerged plant (Hydrilla verticillata) and emerged plant (Scripus triqueter). Then the sorption and desorption experiments were performed, and physicochemical properties, P fractions, and dissolved organic matter (DOM) characteristics were evaluated. Results showed that the treated sediments exhibited similar P sorption kinetic process fitted well with the two-compartment first-order model. Nevertheless, H. verticillata cultured sediment could be well described by the modified Langmuir isotherm model, while S. triqueter cultured sediment fitted the modified Freundlich equations well. The obvious changing P fractions in cultured sediments were BD-P and NaOH-SRP during sorption. H. verticillata and S. triqueter displayed different sorption-desorption behaviors by altering BD-P, humification index, fluorescence intensity, and PARAFAC component contents in sediments. Compared to raw sediment, H. verticillata presented higher P sorption and lower P release from sediments by decreasing BD-P and increasing DOM (fulvic acid-like and humic-like components) content, while S. triqueter showed adverse P sorption and release effects by reducing DOM components. The growth of submerged plants was suggested to make a positive influence on the high efficiency of P retention capacity and low release risk. |
| Databáze: | OpenAIRE |
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