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Effects of pretreatment on the sequential phosphorus fractionation of anaerobic sediment
oleh: Lei Zhang, Qianjiahua Liao, Chao Zeng, Qiongli Mo, Chengxin Fan
Format: | Article |
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Diterbitkan: | PAGEPress Publications 2014-03-01 |
Deskripsi
<p>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 P<sub>NaCl</sub> (P extracted by NaCl), P<sub>BD</sub> (P extracted by Na<sub>2</sub>S<sub>2</sub>O<sub>4</sub> and NaHCO<sub>3</sub>), P<sub>NaOH</sub> (P extracted by NaOH), and organic P were significantly influenced by pretreatment, whereas P<sub>HCl</sub> (P extracted by HCl) and residual P were not significantly affected by pretreatment. Compared to fresh sediment, drying treatments decreased P<sub>NaCl</sub>, P<sub>NaOH</sub>, and organic P but increased P<sub>BD</sub>. 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.</p>