Characteristics of Organic Phosphorus in a Shallow Lake Gehu investigated by Sequential Fractionation and 31P-NMR Technicals

2014 ◽  
Vol 955-959 ◽  
pp. 3529-3539
Author(s):  
Yi Min Zhang ◽  
Jing Chen ◽  
Yue Xiang Gao ◽  
Long Mian Wang ◽  
Fei Yang
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
31P Nmr ◽  
Organic Phosphorus ◽  
Rank Order ◽  
Chemical Fractionation ◽  
Resonance Spectroscopy ◽  
Sequential Fractionation ◽  
Phosphorus Species

Organic phosphorus in sediments of lake Gehu in China was investigated and researched via two methods: chemical fractionation and phosphorus-31 nuclear magnetic resonance spectroscopy. Results of chemical fractionation suggested that concentration of each organic phosphorus species in different sediments may varied highly since different condition, but showed a rank trend : residual Po> HCl-Po> Fulvic-Po> Humic-Po>NaHCO3-Po. Labile and moderately labile Po , regarded as potential P , contributed to 33.6% to 64.6% relative to total Po, which can be degraded for phytoplankton. 31P-NMR results suggested that the rank order of P species presented in NaOH-EDTA extractants of sediments: orthophosphate> monoester-P> DNA-P> pyrophosphate-P, and polyphosphate and phosphonate were almost not detected.

scholarly journals Characteristics and assessment of biogenic phosphorus in sediments from the multi-polluted Haihe River, China, using phosphorus fractionation and phosphorus-31 nuclear magnetic resonance (<sup>31</sup>P-NMR)

2013 ◽  
Vol 10 (10) ◽  
pp. 16269-16294 ◽  
Author(s):  
W. Q. Zhang ◽  
H. Zhang ◽  
W. Z. Tang ◽  
B. Q. Shan
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Algal Blooms ◽  
31P Nmr ◽  
Organic Phosphorus ◽  
Rank Order ◽  
Nmr Analysis ◽  
Haihe River ◽  
P Fractionation ◽  
Nuclear Magnetic

Abstract. We studied the phosphorus (P) pollution, as described by concentrations, distribution and transformation potential, of sediments of the water scarce and heavily polluted Fuyang River, a tributary of the Haihe River, using P fractionation and phosphorus-31 nuclear magnetic resonance (31P-NMR).The sediments of the Fuyang River accumulate significant amounts of inorganic phosphorus (Pi) and organic phosphorus (Po) from industrial and domestic wastewater and agricultural non-point pollution. In terms of their contribution to total phosphorus, the rank order of the P fractions was as follows: H2SO4-P > NaOH-Pi > Res-P > NaOH-Po > KCl-P and their average relative proportions were 69.7:47.5:15.9:2.9:1.0 (the proportion was based on the average proportion of the KCl-P). Seven P compounds were detected by the 31P-NMR analysis. Orthophosphate (Ortho-P: 45.2–92.4%) and orthophosphate monoesters (mono-P: 6.6–45.7%) were the dominant forms. Smaller amounts of pyrophosphates (pyro-P: 0.1–6.6%), deoxyribonucleic acid (DNA-P: 0.3–3.9%), phosphonates (phon-P: 0–3.3%), phospholipids (lipids-P: 0–2.7%) and polyphosphate (poly-P: 0–0.04%) were observed in the sediments. Results of P fractionation and 31P-NMR analysis showed that 35% of Pi was labile P, including KCl-P and NaOH-Pi (Fe-P and Al-P). Biogenic-P accounted for 24% of P in the sediments. Analysis of the relationships between P species and water quality indicated that the Po compounds would mineralize to form ortho-P and would be potentially bioavailable for recycling to surface water, supporting further growth of phytoplankton and leading to algal blooms.

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