| 太湖沉积物氮磷吸附/解吸特征分析 |
| 摘要点击 4212 全文点击 3794 投稿时间：2010-05-27 修订日期：2010-10-09 |
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| 中文关键词 太湖 氮 磷 吸附/解吸 吸附速率 |
| 英文关键词 Taihu Lake nitrogen phosphorus adsorption/desorption adsorption efficiency |
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| 中文摘要 |
| 通过90组吸附/解吸实验研究了太湖沉积物氮、磷的吸附/解吸等温线特征,同时将平衡点浓度、本底吸附量、吸附效率与间隙水、沉积物中各形态氮、磷进行相关性分析,以期对太湖沉积物的“源”、“汇”情况进行分析.结果表明,在供试的浓度范围内,沉积物氮磷的吸附/解吸等温线呈显著线性关系,全湖氮的平均吸附/解吸平衡点浓度为1.10 mg/L；磷的平均吸附/解吸平衡点浓度为0.11 mg/L.平均沉积物本底吸附态氮为23.55 mg/kg、平均本底吸附态磷为11.72 mg/kg,在污染较严重的地区沉积物的本底吸附态氮磷值较大；沉积物对氮的平均吸附效率为23.14 L/kg,对磷的平均吸附效率为102.09 L/kg.氮、磷吸附/解吸平衡点浓度均与间隙水、沉积物中氨氮和无机磷表现出明显的相关性.通过吸附/解吸平衡点的分析发现:从总体上看,太湖沉积物是上覆水体营养盐的“源”. |
| 英文摘要 |
| The adsorption isotherms curves of 90 simples were studied in Taihu Lake through the experiment of adsorption/desorption. And the relation between the equilibrium concentrations,NAP,adsorption efficiency and corresponding parameter in interstitial water and sediment has been analyzed,in order to analyze the “source”and “collection”of Taihu.The results showed that the isotherms curves of nitrogen and phosphorus in the sediment had significant correlations in the range of the concentrations of experiment. The average equilibrium concentrations of nitrogen and phosphorus are 1.10 mg/L and 0.11 mg/L respectively.The average of NAP of nitrogen and phosphorus are 23.55 mg/kg and 11.72 mg/kg respectively. The NAP of nitrogen and phosphorus are higher in the area of serious pollution.The average adsorption efficiency of nitrogen and phosphorus are 23.14 L/kg and 102.09 L/kg respectively. Significant correlations were found between the equilibrium concentrations of adsorption/desorption of nitrogen and phosphous and corresponding parameter in interstitial water or sediment. Overall the sediment is the “source” of the nitrogen and phosphorus. |
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