| 磷在不同类型湖泊沉积物上的吸附特征及形态再分布研究 |
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| 引用本文： | 吕昌伟,孟婷婷,张细燕,崔萌,万丽丽,何江,白帆,杨旭.磷在不同类型湖泊沉积物上的吸附特征及形态再分布研究[J].农业环境科学学报,2012,31(2):402-409. |
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| 作者姓名： | 吕昌伟 孟婷婷 张细燕 崔萌 万丽丽 何江 白帆 杨旭 |
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| 作者单位： | 1. 内蒙古大学环境与资源学院,呼和浩特010021;内蒙古大学环境地质研究所,呼和浩特010021
2. 内蒙古大学环境与资源学院,呼和浩特,010021 |
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| 基金项目： | 国家自然科学基金项目，内蒙古自然科学基金项目，"国家大学生创新性实验计划"项目 |
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| 摘 要： | 以乌梁素海和岱海表层沉积物为吸附剂,开展了磷在沉积物上的吸附动力学和等温吸附实验研究,采用交叉型Langmuir模型描述了磷在2个湖泊沉积物上的吸附行为,并分析测定了等温吸附后沉积物中磷的形态分布。结果表明,不同浓度条件下沉积物对磷的吸附动力学过程基本相似,Elovich方程能较好地描述2个湖泊沉积物对磷酸盐的吸附动力学过程;Langmuir交叉型吸附等温式能较好地描述磷在岱海和乌梁素海沉积物上的等温吸附行为(R2=0.990),模型中的k、Qm、EPC0、NAP等参数较好地反映了2个湖泊沉积物在成因、粒度及矿物组成等方面的差异;吸附磷的形态再分布揭示颗粒物所吸附的水相磷主要分布于Ex-P,且Or-P是沉积物中重要的潜在生物有效性磷源,对湖泊富营养化的作用不容忽视。
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| 关 键 词： | 吸附特征 形态分布 磷 沉积物 |
Adsorption Characters and Form Distribution of Phosphorus in Sediments from Different Type Lakes |
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| L Chang-wei
,
MENG Ting-ting
,
ZHANG Xi-yan
,
CUI Meng
,
WAN Li-li
,
HE Jiang
,
BAI Fan
,
YANG Xu.Adsorption Characters and Form Distribution of Phosphorus in Sediments from Different Type Lakes[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2012,31(2):402-409. |
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| Authors: | L Chang-wei MENG Ting-ting ZHANG Xi-yan CUI Meng WAN Li-li HE Jiang BAI Fan YANG Xu |
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| Institution: | L(U) Chang-wei
,
MENG Ting-ting
,
ZHANG Xi-yan
,
CUI Meng
,
WAN Li-li
,
HE Jiang
,
BAI Fan
,
YANG Xu |
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| Abstract: | Taking surface sediments from the Wuliangsuhai and Daihai Lake as adsorbent, the adsorption kinetics and isothermal adsorption experiments were carried on and the adsorption behavior was explained by Langmuir crossover-type equations, then the form distribution characters of phosphorus were studied after adsorption in this work. The results showed that the adsorption kinetics processes were similar under different initial concentrations of phosphorus and the Elovich model can be used to fit the adsorption kinetics processes of phosphorus adsorption on the two lakes sediments; from the view of adsorption rates, the maximum of adsorption rates were found at the first 0~1 min and the adsorption rates of phosphorus on the sediments from Daihai Lake and Wuliangsuhai Lake were up to 961.08~7 036.18 mg·kg-1·h-1 and 563.35~4 464.29 mg·kg-1·h-1 respectively at different initial phosphorus concentration. During the first 0~1 h, the percentages of adsorption capacity of phosphorus on sediments from Daihai Lake and Wuliangsuhai Lake were 88%~99% and 75%~93% respectively; the Cross-Langmuir model can be used to fit the isothermal adsorption(R2=0.990), and the parameters such as k, Qm, EPC0 and NAP revealed the differences on sediments origin, grains and mineral composition between the two lakes; the form distribution characters after adsorption indicated that phosphorus adsorbed on particles were mainly added on the form of the exchangeable phosphorus, and the organic phosphorus had important potential bioavailability. |
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| Keywords: | adsorption behavior form distribution phosphorus sediment |
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