Characterization of organic phosphorus in lake sediments by sequential fractionation and enzymatic hydrolysis

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yuanrong Zhu
  • Fengchang Wu
  • Zhongqi He
  • Jianyang Guo
  • Xiaoxia Qu
  • And 4 others
  • Fazhi Xie
  • John P. Giesy
  • Haiqing Liao
  • Fei Guo

Detail(s)

Original languageEnglish
Pages (from-to)7679-7687
Journal / PublicationEnvironmental Science and Technology
Volume47
Issue number14
Publication statusPublished - 16 Jul 2013

Abstract

The role of sediment-bound organic phosphorus (Po) on lake eutrophication was studied using sequential extraction and enzymatic hydrolysis by collecting sediments from Dianchi Lake, China. Bioavailable Po species including labile monoester P, diester P, and phytate-like P were identified in the sequential extractions by H2O, NaHCO3, and NaOH. For the H2O-Po, 36.7% (average) was labile monoester P, 14.8% was diester P, and 69.9% was phytate-like P. In NaHCO 3-Po, 19.9% was labile monoester P, 17.5% was diester P, and 58.8% was phytate-like P. For NaOH-Po, 25.6% was labile monoester P, 7.9% was diester P, and 35.9% was phytate-like P. Labile monoester P was active to support growth of algae to form blooms. Diester P mainly distributed in labile H2O and NaHCO3 fractions was readily available to cyanobacteria. Phytate-like P represents a major portion of the Po in the NaOH fractions, also in the more labile H2O and NaHCO 3 fractions. Based on results of sequential extraction of P o and enzymatic hydrolysis, lability and bioavailability was in decreasing order as follows: H2O-Po > NaHCO 3-Po > NaOH-Po, and bioavailable P o accounted for only 12.1-27.2% of total Po in sediments. These results suggest that the biogeochemical cycle of bioavailable P o might play an important role in maintaining the eutrophic status of lakes. © 2013 American Chemical Society.

Citation Format(s)

Characterization of organic phosphorus in lake sediments by sequential fractionation and enzymatic hydrolysis. / Zhu, Yuanrong; Wu, Fengchang; He, Zhongqi; Guo, Jianyang; Qu, Xiaoxia; Xie, Fazhi; Giesy, John P.; Liao, Haiqing; Guo, Fei.

In: Environmental Science and Technology, Vol. 47, No. 14, 16.07.2013, p. 7679-7687.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review