| 硅在湖泊沉积物上的吸附特征及形态分布研究 |
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| 引用本文： | 吕昌伟,崔萌,高际玫,张细燕,万丽丽,何江,孟婷婷,白帆,杨旭. 硅在湖泊沉积物上的吸附特征及形态分布研究[J]. 环境科学, 2012, 33(1): 135-141 |
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| 作者姓名： | 吕昌伟 崔萌 高际玫 张细燕 万丽丽 何江 孟婷婷 白帆 杨旭 |
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| 作者单位： | 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;内蒙古大学环境与资源学院,呼和浩特 010021;内蒙古环境监测中心站,呼和浩特 010011;内蒙古大学环境与资源学院,呼和浩特 010021;内蒙古大学环境与资源学院,呼和浩特 010021;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;内蒙古大学环境与资源学院,呼和浩特 010021;内蒙古大学环境与资源学院,呼和浩特 010021;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(41003049); 内蒙古自然科学基金项目(2009BS0601); "国家大学生创新性实验计划"项目(20081012614) |
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| 摘 要： | 以乌梁素海(WLSH)和岱海(DH)表层沉积物为吸附剂,开展了硅在沉积物上的等温吸附及形态再分布实验研究.结果表明,在低浓度梯度范围内(≤3.00 mg.L-1),硅在乌梁素海和岱海沉积物上的吸附行为均可用线性模型描述,且2个湖泊沉积物分别处于吸附硅和解吸硅的吸附/解吸反应的不同阶段;Langmuir交叉型吸附等温式、Freundlich交叉吸附等温式和Temkin交叉型吸附等温式均能较好地描述硅在2个湖泊沉积物上的吸附行为,结合沉积物自身吸持硅(NAS)和吸附/解吸平衡浓度(ESC0),阐释了2个湖泊沉积物对硅的源汇作用;以硅的形态再分布为基础,揭示沉积物中离子交换态(IEF-Si)释放硅能力,同时也不能忽视铁锰氧化物结合态(IMOF-Si)和有机物硫化物结合态(OSF-Si)的可持续释硅能力,可为探讨真实环境体系中硅的吸附/解吸机制,阐释湖泊富营养化的营养盐限制机制及营养盐耦合作用对碳循环拉动机制等提供理论依据和基础数据.
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| 关 键 词： | 吸附特征 形态分布 硅 沉积物 湖泊 |
| 修稿时间： | 2011-06-27 |
Adsorption Characteristic and Form Distribution of Silicate in Lakes Sediments |
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| LV Chang-wei,CUI Meng,GAO Ji-mei,ZHANG Xi-yan,WAN Li-li,HE Jiang,MENG Ting-ting,BAI Fan and YANG Xu. Adsorption Characteristic and Form Distribution of Silicate in Lakes Sediments[J]. Chinese Journal of Environmental Science, 2012, 33(1): 135-141 |
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| Authors: | LV Chang-wei CUI Meng GAO Ji-mei ZHANG Xi-yan WAN Li-li HE Jiang MENG Ting-ting BAI Fan YANG Xu |
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| Affiliation: | College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China;Institute of Environmental Geology, Inner Mongolia University, Huhhot 010021, China;College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China;Inner Mongolia Environment Monitoring Center Station, Hohhot 010011, China;College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China;College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China;College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China;Institute of Environmental Geology, Inner Mongolia University, Huhhot 010021, China;College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China;College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China;College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China |
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| Abstract: | Taking surface sediments from the Wuliangsuhai Lake and Daihai Lake as adsorbent, the isothermal adsorption experiments of silicate on sediments were carried out and the adsorption behavior was explained by Langmuir, Freundlich and Temkin crossover-type equations, then the form distribution characters of silicate were studied after adsorption in this work. The results showed that the adsorption behavior of silicate on the two lakes sediments can be linear fitting in the lower concentration dose (< or = 3.00 mg x L(-1)); the sediments from the Wuliangsuhai Lake behaved adsorbing silicate while the sediments from the Daihai Lake behaved releasing silicate under the experimental dose; all of the Langmuir, Freundlich and Temkin crossover-type equations can be used to explain the adsorption behavior of silicate on the two lakes sediments, and the native adsorption silicate (NAS) and equilibrium silicate concentration (ESC(0)) calculated by the three equations could be used to explain the sink and source effects of the sediments from the two lakes; the silicate form distribution in the sediments after adsorption indicated that silicate adsorbed on particles were mainly added on the form of IEF-Si, CF-Si, IMOF-Si and OSF-Si, and the IMOF-Si and OSF-Si had important potential bioavailability. |
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| Keywords: | adsorption behavior form distribution silicate sediment lakes |
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