Optimizing chemical extraction of organic phosphorus from sediment using 31P nuclear magnetic resonance spectroscopy

Document Type

Article

Publication Date

5-1-2011

Abstract

Procedures for chemical extraction of organic phosphorus (OP) from sediments of Taihu Lake were optimized using solution 31P nuclear magnetic resonance spectroscopy (31P-NMR). The results showed that the extraction efficiencies for total phosphorus and OP increased with pH when NaOH and EDTA were used as solutes. The extraction efficiency of NaOH-EDTA was significantly higher than that of NaOH alone. The mixture of 0.25 mol·L-1 NaOH and 50 mmol·L-1 EDTA was the best extractant for OP extraction, as evidenced by the 31P-NMR spectrum. The release of sediment-bound OP in chemical extraction could be attributed to the double effects of OH- competition under strong alkaline conditions and EDTA chelation for metal ions. It should be noticed that the chelation of metal ions with EDTA simultaneously increased the extraction of magnetic ions (such as Fe3+ and Mn2+) from sediment, which may result in interferences, such as peak overlap on the 31P-NMR spectrum.

Publication Source (Journal or Book title)

Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae

First Page

996

Last Page

1003

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