Biogenic phosphorus speciations in the sediments of an artificial river in the Haihe River Basin characterized with ³¹P nuclear magnetic resonance spectroscopy(³¹P-NMR)

Phosphorus(P) speciations in the sediments of Fuyang New River, located in the Haihe River Basin of eastern China, were detected by ³¹P nuclear magnetic resonance spectroscopy(³¹P-NMR). Totally six P species were detected in Fuyang New river, including two inorganic P species(orthophosphate and pyrophosphate) and four OP species(phosphonates, orthophosphate monoesters, phospholipids and DNA). Biogenic phosphorus in the sediments of Fuyang New River included phosphonates(0.11%~1.57%), orthophosphate monoester(8.96%~29.58%), phospholipids(0.28%~2.66%), DNA(0.75%~2.03%) and pyrophosphate(0.22%~0.86%). Among which, phosphate monoester was the main component in biogenic phosphorus. The difference of phosphorus concentration was significant along with the water flow. The highest concentration of TP and biogenic phosphorus were 6804.1 mg·kg^-1 and 1709.58 mg·kg^-1, respectively near the watergate; along with the water flow, the TP change rates were 84.97%, -24.11%, 32.84% and -0.11%, respectively; The change rates of biogenic phosphorus were 93.15%, -58.83%, 42.65% and 18.99%, respectively. The concentrations of TP and SRP were 3.0 mg·L^-1 and 2.6 mg·L^-1, respectively, which were 7.5 and 6.5 times higher than the Grade V of the National Water Quality Standard(GB3838-2002). Based on the ³¹P-NMR, there is a new cognition of the distribution and transmission of P in the artificial river. Therefore, this paper provides a solid support for better understanding the transformation of phosphorus in the artificial rivers system and it is useful for further research into the bio-geochemical cycle process of phosphorus in the artificial river. Meanwhile, it provides data support for water flow scheduling and water ecological building in the multi-dam artificial rivers.