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首页> 外文期刊>Environmental Science & Technology >Aluminum Control of Phosphorus Sorption by Lake Sediments
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Aluminum Control of Phosphorus Sorption by Lake Sediments

机译：铝对湖泊沉积物对磷的吸附作用

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摘要

Release of reactive (phosphate-like) phosphorus (P) from freshwater sediments represents a significant internal P source for many lakes.Hypolimnetic P release occurs under reducing conditions that cause reductive dissolution of ferric hydroxide [Fe(OH)_3].This hypolimnetic P release may be naturally low or artificially reduced by sediment with naturally high or artificially elevated concentrations of aluminum hydroxide [Al(OH)_3].We present field and laboratory data for a common extraction analysis of sediments from 43 lakes differing in trophic status,pH regime,climate,and P loading.The results indicate that a simple sequential extraction of sediment may be a useful predictor of sediment's ability to release P.Sequential extractions of sediment P,Al,and Fe by water (H_2O),bicarbonate-dithionite (BD),and NaOH (at 25 deg C) showed that negligible amounts of P would be released from lake sediments during hypolimnetic anoxia if either (1) the molar Al_(NaOH approx 25):Fe_(BD) ratio is >3 or (2) the molar Al_(NaOH approx 25):P_((H_2O+BD)) ratio is >25.These ratios can be used as operational targets for estimation of sediment P release potential and Al dosing of P-rich sediment to prevent hypolimnetic P release under anoxic conditions.
机译：淡水沉积物释放的反应性（磷酸盐样）磷（P）是许多湖泊的重要内部磷源。水合磷的释放发生在还原条件下，导致氢氧化铁[Fe（OH）_3]的还原溶解。释放量可能自然降低或人为减少，而沉积物可能带有自然高浓度或人为升高的氢氧化铝浓度[Al（OH）_3]。我们提供了田野和实验室数据，用于常见提取营养状态，pH不同的43个湖泊的沉积物结果表明，简单的连续沉积物提取可能是沉积物释放P的能力的有用预测指标。水（H_2O），碳酸氢盐-连二亚硫酸盐（P_2）依次提取沉积物P，Al和Fe BD）和NaOH（在25摄氏度时）表明，如果（1）Al_（NaOH约25）：Fe_（BD）的摩尔比大于3，则在低铁性缺氧过程中湖泊沉积物中释放的P量可忽略不计或（2）Al_（NaOH约25）：P _（（H_2O + BD））的摩尔比大于25，这些比值可用作估算沉积物P释放潜力和富P沉积物向Al配给量的操作目标防止在缺氧条件下低铁磷释放。

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  • 来源
    《Environmental Science & Technology》 |2005年第22期|p.8784-8789|共6页
  • 作者

    JIRI KOPACEK; JAKUB BOROVEC; JOSEF HEJZLAR; KAI-UWE ULRICH; STEPHEN A.NORTON;

  • 作者单位

    Hydrobiological Institute,Academy of Sciences of the Czech Republic,and Faculty of Biological Sciences USB,Na Sadkach 7,37005 Ceske Budejovice,Czech Republic,Institute of Radiochemistry,Forschungszentrum Rossendorf e.V.,Postfach 51 01 19,D-01314 Dres;

    Hydrobiological Institute,Academy of Sciences of the Czech Republic,and Faculty of Biological Sciences USB,Na Sadkach 7,37005 Ceske Budejovice,Czech Republic,Institute of Radiochemistry,Forschungszentrum Rossendorf e.V.,Postfach 51 01 19,D-01314 Dres;

    Hydrobiological Institute,Academy of Sciences of the Czech Republic,and Faculty of Biological Sciences USB,Na Sadkach 7,37005 Ceske Budejovice,Czech Republic,Institute of Radiochemistry,Forschungszentrum Rossendorf e.V.,Postfach 51 01 19,D-01314 Dres;

    Hydrobiological Institute,Academy of Sciences of the Czech Republic,and Faculty of Biological Sciences USB,Na Sadkach 7,37005 Ceske Budejovice,Czech Republic,Institute of Radiochemistry,Forschungszentrum Rossendorf e.V.,Postfach 51 01 19,D-01314 Dres;

    Hydrobiological Institute,Academy of Sciences of the Czech Republic,and Faculty of Biological Sciences USB,Na Sadkach 7,37005 Ceske Budejovice,Czech Republic,Institute of Radiochemistry,Forschungszentrum Rossendorf e.V.,Postfach 51 01 19,D-01314 Dres;

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  • 正文语种 eng
  • 中图分类 环境化学;
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