Potential for sediment phosphorus release in coal mine subsidence lakes in China: perspectives from fractionation of phosphorous, iron and aluminum

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• 作者：Qitao Yi ; Pengfei Sun ; Siping Niu ; Youngchul Kim
• 关键词：Aluminium ; Iron ; Phosphorus ; Sediment ; Soil inundation ; Subsidence lakes in China
• 刊名：Biogeochemistry
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：126
• 期：3
• 页码：315-327
• 全文大小：1,434 KB
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  Reitzel K
• 作者单位：Qitao Yi (1)
  Pengfei Sun (1)
  Siping Niu (2)
  Youngchul Kim (2)
  
  1. School of Earth and Environment, Anhui University of Science and Technology, Huainan, 232001, China
  2. Department of Environmental Engineering, Hanseo University, Seosan, 356706, Korea
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geochemistry
  Biochemistry
  Soil Science and Conservation
  Terrestrial Pollution
  
• 出版者：Springer Netherlands
• ISSN：1573-515X

文摘

Few studies have been conducted on how the quantitative relationship between phosphorus (P) and iron (Fe) and aluminium (Al) compounds in the sediments of coal mine subsidence lakes influence sediment P release. Four representative lakes, characterized by sedimentary environments of soil inundation, were selected in the Huainan and Huaibei coal mine areas of China. Their ages, pollutant loading patterns and nutrient levels were assessed to evaluate the potential for sediment P release based on the fractional composition of P, Fe and Al. Sediment P, Fe and Al were extracted sequentially using ammonium chloride (NH₄Cl), bicarbonate-dithionite (BD) and sodium hydroxide (NaOH) at 25 °C, followed by HCl, and then NaOH at 85 °C. The resulting fractions were considered as environmental indicators for P, Fe and Al, including ion-exchangeable forms (NH₄Cl-P, NH₄Cl-Fe, NH₄Cl-Al), associated fractions with reducible metal hydroxides (BD-P, BD-Fe, BD-Al) and amorphous hydroxides (NaOH₂₅-P, NaOH₂₅-Fe, NaOH₂₅-Al), acid-soluble fractions (HCl-P, HCl-Fe, HCl-Al) and residual species (NaOH₈₅-P, NaOH₈₅-Fe, NaOH₈₅-Al), respectively. The potential for sediment P release was related to the concentrations of Al and Fe compounds in the presence of soil inundation. Calcareous soils in the Huaibei area were influential in regulating sediment P release, whereas soil Fe and Al were influential in the Huainan area. The results agreed with a common empirical model that predicts low P flux if the molar ratio of [NH₄Cl-Al + BD-Al + NaOH₂₅-Al]:[NH₄Cl-Fe + BD-Fe] > 3 or [NaOH₂₅-Al]:[NH₄Cl-P + BD-P] > 25 in sediments when anoxia develops. Increased loading of oxidizable matter (OM) or enriched P bound to Fe oxides tends to change these ratios and increase the potential for sediment P release. Keywords Aluminium Iron Phosphorus Sediment Soil inundation Subsidence lakes in China