Behavior of different phosphorus species in suspended particulate matter in the Changjiang estuary |
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| Authors: | HE Huijun Chen Hongtao Yao Qingzhen Qin Yanwen MI Tiezhu YU Zhigang |
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| Institution: | [1]College of Chemistry, and Chemical Engineering, Ocean University of China, Qingdao 266003, China [2]Estuarine and Coastal Environment Research Center, Chinese Research Academy of Environmental Seiences, Beijing 100012,China [3]College of Environmental Science and Engineering, Ocean University of China, Qingdao 266003, China |
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| Abstract: | Suspended particulate matter (SPM) collected in the Changjiang (Yangtze River) estuary in June 2006 was separated into five
fractions via water elutriation: clay-very fine silt (<8 μm), fine silt (8–16 μm), medium silt (16–32 μm), coarse silt (32-63
μm) and sand (>63 μm). The SPM and fractionated particles were sequentially analyzed by a modified SEDEX sequential extraction
method to obtain six species of phosphorus: exchangeable or loosely-sorbed P, organic P, Fe-bound P, authigenic P, detrital
P and refractory P. The results indicated that all particulate phosphorus species except for detrital P were negatively correlated
to particle size; a high detrital P content was found in coarse silt and very coarse silt. From the inside of the river mouth
to the gate of the river mouth, organic P, Fe-bound P and refractory P in the suspended particles decreased and a higher amount
of exchangeable P appeared around the gate of the river mouth. From the gate of the river mouth to the sea, exchangeable P
and organic P in suspended particles increased distinctly. The total particulate P flux into the estuary from the Changjiang
River was about 45.45×108 μmol/s during sampling. Of this, about 8.27×108 μmol/s was associated with the “truly suspended” fraction. The bio-available particulate P flux was about 13.58×108 μmol/s. Of this, about 4.24×108 μmol/s was transported by “truly suspended” particles. |
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| Keywords: | Changjiang estuary particle size fractions particulate phosphorus species |
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