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首页> 外文期刊>Environmental Monitoring and Assessment >Phosphorus fractions and adsorption characteristics of floodplain sediments in the lower reaches of the Hanjiang River, China
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Phosphorus fractions and adsorption characteristics of floodplain sediments in the lower reaches of the Hanjiang River, China

机译：汉江下游滩涂沉积物的磷组分及其吸附特征

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摘要

The phosphorus fractions and adsorption characteristics of seven floodplain sediment samples collected in the lower reaches of China's Hanjiang River were studied. Most phosphorus fractions showed a marked downstream increase in response to point-source inputs from urban areas. Total phosphorus (TP) contents in the sediments ranged from 603.68 to 945.25 mg.kg~(-1). Inorganic phosphorus (IP) was the major component of TP, and calcium-bound phosphorus (Ca-P) was the major fraction of IP. The distribution characteristics of the phosphorus contents were affected by sediment grain size and hydrodynam-ic conditions. The maximum phosphorus adsorption capacities (Q_(max)) and the half-saturation concentration (k) were obtained using an improved Langmuir model. Native adsorbed exchangeable phosphorus content (w_(NAP)) and the zero-equilibrium phosphorus concentration value (c_(EPC0)) were subsequently calculated. The effects of sediment grain size, temperature, and disturbance on the phosphorus adsorption isotherms were also studied. The results showed that phosphorus adsorption on floodplain sediments was primarily chemisorption; the particle concentration effect played a more important role at a disturbance intensity of 150 r.min~(-1) (on a shaker table) than at 100 r.min~(-1).
机译：研究了在汉江下游采集的七个洪泛区沉积物样品的磷含量和吸附特性。大部分磷组分显示出响应于城市地区点源输入的下游显着增加。沉积物中的总磷含量在603.68至945.25 mg.kg〜（-1）之间。无机磷（IP）是TP的主要成分，钙结合磷（Ca-P）是IP的主要成分。磷含量的分布特征受沉积物粒径和水力条件的影响。使用改进的Langmuir模型获得最大磷吸附容量（Q_（max））和半饱和浓度（k）。随后计算天然吸附的可交换磷含量（w_（NAP））和零平衡磷浓度值（c_（EPC0））。还研究了沉积物粒度，温度和扰动对磷吸附等温线的影响。结果表明，洪泛区沉积物对磷的吸附主要是化学吸附。在扰动强度为150 r.min〜（-1）（在振动台上）时，颗粒浓度效应的作用比在100 r.min〜（-1）时更重要。

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