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Characteristics of Phosphorus Compounds and Their Effects in Sediments of an Eutrophic Chaohu Lake, China
Author(s) -
Wenqiang Zhang,
Baoqing Shan,
Hong Zhang,
Wenzhong Tang
Publication year - 2015
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201300254
Subject(s) - eutrophication , sediment , phosphate , phosphorus , pyrophosphate , environmental chemistry , chemistry , geology , nutrient , biochemistry , enzyme , organic chemistry , paleontology
Surface sediments and sediment cores in a shallow eutrophic lake, Chaohu Lake, were analyzed by 31 P‐NMR to reveal the phosphorus (P) species and their effects on upper water quality. Total P (TP) in the NaOH‐EDTA extracts was dominated by inorganic phosphate (P i ), with higher levels being observed in the heavily eutrophic western lake (79.1 ± 1.7%) than in the eastern lake (68.1 ± 2.4%). These findings were opposite to those for organic phosphorus (P o ). P i ( ortho ‐phosphate and pyrophosphate) and P o (phosphonates, ortho ‐phosphate monoesters and phospholipids, DNA) were detected in the NaOH‐EDTA extracts of the sediments by 31 P‐NMR. The majority of P o consisted of ortho ‐phosphate monoesters (80.2 ± 2.7%). For sediment cores, the contents of phospholipids and DNA declined more rapidly than that of ortho ‐phosphate monoesters and pyrophosphate as sediment depth increased, with these compounds primarily occurring in the top 10 cm of sediment. The positive relationship between P o in sediment and TP in the water showed that P o compounds in the sediment would be released to the water. These compounds of P o will be mineralized to P i and potentially bioavailable for recycling to surface water, supporting further growth of aquatic organisms and leading to algal blooms.