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Effects of pretreatment on the sequential phosphorus fractionation of anaerobic sediment

Lei Zhang, Qianjiahua Liao, Chao Zeng, Qiongli Mo, Chengxin Fan
  • Qianjiahua Liao
    Department of Environmental Science, China Pharmaceutical University, China
  • Chao Zeng
    Department of Environmental Science, China Pharmaceutical University, China
  • Qiongli Mo
    Department of Environmental Science, China Pharmaceutical University, China
  • Chengxin Fan
    Affiliation not present

Abstract

Phosphorus (P) fractionation is critical to understand P cycling in sediment and across the sediment–water interface. To examine the effect of pretreatment on the P fractionation of anaerobic sediment, anaerobic sediment samples were treated by oven-drying, air-drying, and freeze-drying, and a fresh sediment sample was used as a control treatment. A five-step sequential extraction procedure was applied, and six P fractions were examined. The results indicated that PNaCl (P extracted by NaCl), PBD (P extracted by Na2S2O4 and NaHCO3), PNaOH (P extracted by NaOH), and organic P were significantly influenced by pretreatment, whereas PHCl (P extracted by HCl) and residual P were not significantly affected by pretreatment. Compared to fresh sediment, drying treatments decreased PNaCl, PNaOH, and organic P but increased PBD. Among the three drying methods, oven-drying resulted in the greatest change in P fractionation; the effects of air-drying and freeze-drying were similar to each other. The total extracted P were similar among the four pretreatment methods. For the measurement of accurate P fractions, fresh sediment is the best option.

Keywords

pretreatment, phosphorus fractionation, sequential extraction, sediment.

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Submitted: 2013-09-16 12:18:51
Published: 2014-03-03 15:21:26
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Copyright (c) 2014 Lei Zhang, Qianjiahua Liao, Chao Zeng, Qiongli Mo, Chengxin Fan

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