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The spatial distribution and degradation characteristic of phosphorus in suspended particulate matter among different ecological types in Taihu |
ZHANG Yi-min1,2, WANG Yu1, YANG Fei2, HE Dong2, CHEN Tong1, DING Yi-rui1, CHAO Jian-ying2 |
1. School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China;
2. Nanjing Institute of Environmental Science, Ministry of Environmental Protection, Nanjing 210042, China |
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Abstract The contents of particulate matter, composition of organic phosphorus and the degradation characteristics of the water particulates in different ecological types in Lake Taihu were analyzed. The properties of particulate phosphorus and their impact on the water phosphorus cycle of eutrophic lake were researched. The particulate P is 75.86% of TP concentration,in Taihu. and the differences were obvious. Particulate matter content of the estuary zone and the central zone was higher than that of the algae type zone and the grass type zone, but particulate organic matter ratio of the latter two was higher than that of the formers.The P species composition of water particulate in different lake area by using 31P nuclear magnetic resonance method(31P-NMR) showed that the composition of particulate organic phosphorus includes 6kinds, including phosphonates, orthophosphate, orthophosphate monoesters, orthophosphate diester, pyrophosphate and polyphosphate. The content was respectively 1.06%, 50.99%, 33.02%, 2.48%, 10.68% and 3.80%. 31P-NMR results show that the distribution of particulate phosphorus between different ecological types is obvious. The content of orthophosphate in the estuary zone was 82.57%, the highest. The algae type zone and the central zone were with higher Chla concentration and the highest particle organic phosphorus ratio meanwhile, respectively reached 64.02% and 63.95%, indicating that different types of ecological system had significant impacts on particulate phosphorus group. The concentration of pyrophosphate and polyphosphate was significantly correlated with the concentration of Chla (P<0.05; P<0.01). Particulate enzymatically hydrolysable phosphorus (PEHP) was significantly correlated to the orthophosphate (P<0.05), which indicated that the particles was the important sources of biogentic phosphorus in Taihu. The mean degradation time of PEHP in Taihu was 47.23min, which was 65.16% of enzymatically hydrolysable phosphorus (EHP), indicating that particulate P is an important source of soluble reactive P(SRP).
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Received: 09 December 2015
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