检索结果-南通市图书馆

Effects of geosorbent and solution properties on sorption and desorption of PAHs

Acta Geochimica 2021年第2期40卷 212-224页

作者： Hui Dong baohua xiao State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550018China University of Chinese Academy of Sciences Beijing 100049China

Characteristics of phenanthrene and pyrene’s sorption and desorption on two local soils in solutions of simulated groundwater,simulated lung fluid,and simulated saliva were studied with batch equilibrium experiments to understand the fate of PAHs in the karst region of southwestern China and to assess the environmental exposure and the health risk of *** results showed that the sorption and desorption isotherms of phenanthrene and pyrene on two target soils in the three solution systems could be adequately described by the Freundlich model,while the fitted isotherm parameters for the simulated groundwater solution distinguished notably from those for the simulated body fluid *** the sorption experiments,in the simulated groundwater,the n values were 0.722 and 0.672 for phenanthrene and were 0.724 and0.663 for pyrene,respectively,on the yellow soil and the limestone soil;The log KF values were 3.118 and 3.323 for phenanthrene and were 3.648 and 3.846 for pyrene,respectively,on the yellow soil and the limestone *** the simulated body fluids,the n values for phenanthrene and pyrene ranged from 0.622 to 0.836 and from 0.590 to0.865,respectively,and the log KF values of phenanthrene and pyrene ranged from 2.845 to 3.327 and from 3.344 to3.779,*** the desorption experiments,in the simulated groundwater,the n values were 0.662 and 0.744 for phenanthrene and were 0.702 and 0.647 for pyrene,respectively,on the yellow soil and the limestone *** log KF values were 3.666 and 3.686 for phenanthrene and were 4.128 and 4.225 for pyrene,respectively,on the yellow soil and the limestone *** the simulated body fluids,the n values for phenanthrene and pyrene ranged from 0.612 to 0.668 and from 0.631 to 0.819,respectively,and the log KF values of phenanthrene and pyrene ranged from 3.134 to 3.407 and from 3.533 to 3.839,*** limestone soil had relatively higher log KF values but lower KOC values compared to those of the yellow soil,i

关键词： PAHs Sorption–desorption Simulated body fluids Yellow soil Limestone soil

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Interaction of Ca^(2+) and soil humic acid characterized by a joint experimental platform of potentiometric titration, UV–visible spectroscopy, and fluorescence spectroscopy

引用

Acta Geochimica 2021年第3期40卷 300-311页

作者： Haiming Tang baohua xiao Peiwen xiao State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of SciencesGuiyang 550081GuizhouChina University of Chinese Academy of Sciences Beijing 100049China

Rocky desertification has become a major environmental issue in the karst region of southwestern *** rocky desertification was more severe in regions of limestone soil than in adjacent regions of other soils,despite the relatively higher soil organic matter(SOM)content in limestone *** underlying mechanism remains *** speculated that the geochemical characteristics of limestone soils in the karst region plays an essential role,especially the high calcium content of limestone *** test this hypothesis,we collected limestone soil samples from a limestone soil profile in the southwestern China karst region and extracted humic acid(HA)from these limestone soil *** investigated the interaction of Ca^(2+)and three HA samples on a joint experimental platform,which consists of an automatic potentiometric titrator,a UV–visible spectrometer,and a Fluorescence *** solutions were titrated by Ca^(2+)and optical spectra of the HA solutions were monitored during the titration *** results indicated that:(1)the interaction of Ca^(2+)and HA is a combined process of adsorption and *** dominated the overall distribution behavior of Ca^(2+),which could be fit by Langmuir and Freundlich isotherm *** was distinguished only when the concentration of Ca2+is low;(2)the changes of UV–visible spectroscopy and excitation–emission matrix fluorescencespectroscopy spectra of HA samples when they were binding with Ca^(2+)implied the apparent molecular size and structure of HA became larger and more complex;(3)the combination of Ca^(2+)and HA plays an important role in the SOM preservation of limestone soils but the stability of the Ca–HA association was relatively *** present study draws attention to maintaining the relatively higher Ca^(2+)concentration in limestone soils in ecologic restoration attempts in karst regions.

关键词： Limestone soil Humic acid Calcium Interaction Titration UV–Vis EEM

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research progress on aging of organic pollutants in geosorbents:a review

引用

Acta Geochimica 2017年第1期36卷 27-43页

作者： Xianjin An baohua xiao Xinyue Di Hui Dong Haiming Tang State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of SciencesGuiyang 550002 China University of Chinese Academy of Sciences Beijing 100049China

Geosorbents are the main host of anthropogenic organic pollutants and play a vital role in their fate and transport in the natural *** and sediment are the most common and abundant geosorbents in the natural environment;their interactions with organic pollutants,especially sorption and desorption processes,have been extensively studied from the perspectives of thermodynamics and ***,the aging of organic pollutants in geosorbents has drawn increased attention,leading to an improved understanding of interactions between organic pollutants and geosorbents and informing remediation *** has been deemed important in accurately assessing ecologic and health risks of organic pollutants,and both positive and negative impacts have been reported in studies of natural and artificial *** paper summarizes recent research progress on organic pollutant aging in geosorbents,including related mechanism research,influence factors,bioavailability assessments,and biological and physicochemical remediation of aged organic *** also discuss issues in the current research and bring forward suggestions for future study.

关键词： Geosorbent Aging effects Bioavailability Organic pollutants Supergene processes

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The effects of soil sand contents on characteristics of humic acids along soil profiles

引用

Acta Geochimica 2016年第3期35卷 251-261页

作者： Xinyue Di Hui Dong Xianjin An Haiming Tang baohua xiao State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Graduate University of Chinese Academy of Sciences Beijing 100049China

It is generally accepted that the compositions and properties of soil organic matter （SOM） are influenced by many factors. In order to reveal the effects of soil texture on characteristics and dynamics of SOM and its sub-fraction, humic acid （HA）, along two soil profiles, a yellow soil profile and a purplish soil profile, under the same climate and vegetation conditions were determined. Results indi- cate that the decomposition and humification degrees of SOM and HA of the purplish soils are higher than those of the corresponding yellow soils indicated by A/O-A ratios of HAs, TOCs and HA yields of bulk soil samples, neverthe- less, the development degree of the purplish soil is lower than that of the yellow soil. The variations of E4/E6 ratios of HAs along the soil profiles indicate the overall molecular sizes of HAs decreased downward along the soil profiles. A/O-A ratios of HAs decreased downward along both the soil profiles indicate that humification processes decrease downward along both the soil profiles. Leaching of SOM shows significant effects on the distribution and character- istics of HAs in the yellow soil profile but the purplish soil profile, which is consistent with the higher hydrophobicity of HAs in purplish soils, shows that the distribution char- acteristics of SOM along the soil profiles are a complex result of the combination of soil texture and characteristics of SOM itself. The remarkably different sand contents are concluded tentatively as one of reasons to the differentdistributions and dynamics of HAs along the soil profiles, however, to profoundly understand the evolution and transport of SOM along soil profiles needs more researches.

关键词： Soil profile Soil organic matter Humic acid Characteristics Sand content

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Characteristics and distributions of humic acids in two soil profiles of the southwest China Karst area

引用

Acta Geochimica 2016年第1期35卷 85-94页

作者： Liangang Ma baohua xiao Xinyue Di Weilin Huang Shijie Wang State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of SciencesGuiyang 550002 China University of Chinese Academy of Sciences Beijing 100049China Department of Environmental Sciences Rutgers UniversityNew Brunswick NJ 08901 USA

Characteristics and distributions of humic acid(HA) and soil organic matter(SOM) in a yellow soil profile and a limestone soil profile of the southwest China Karst area were systematically investigated to reveal their evolutions in different soils of the study area. The results showed that characteristics and distribution of SOM along the two soil profiles were notably different. Total organic carbon(TOC) contents of soil samples decreased just slightly along the limestone soil profile but sharply along the yellow soil profile. TOCs of the limestone soils were significantly higher than those of the corresponding yellow soils, and C/N ratios of SOMs showed a similar variation trend to that of TOCs, indicating that SOM can be better conserved in the limestone soil than in the yellow soil. The soil humic acids were exhaustively extracted and further fractionated according to their apparent molecular weights using ultrafiltration techniques to explore underlying conservation mechanisms. The result showed that C/N ratios of HAs from different limestone soil layers were relatively stable and that large molecular HA fractions predominated the bulk HA of the top soil, indicating that HA in the limestone profile was protected while bio and chemical degradations were retarded. Combined with organic elements contents and mineral contents of two soils, weconcluded that high calcium contents in limestone soils may play a key role in SOM conservation by forming complexation compounds with HAs or/and enclosing SOMs with hypergene CaCO_3 precipitation.

关键词： Soil Soil organic matter Humic acid Characteristics Distribution Southwest China Karst area

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

土柱淋洗实验研究进展及其在土壤有机碳迁移研究中的应用展望

引用

地球与环境 2021年第1期49卷 106-114页

作者：肖佩文肖保华中国科学院地球化学研究所贵阳550081 中国科学院大学北京100049

土壤碳库是陆地生态系统碳循环中重要的源与汇,其小幅的变化都将对大气CO2含量造成巨大的反馈。全球约有1 500 Gt的有机碳储存在土壤中,土壤有机碳的迁移转化一直以来是学者们关注的热点问题。土柱淋洗实验在农业、林业、环境科学等研... 详细信息

土壤碳库是陆地生态系统碳循环中重要的源与汇,其小幅的变化都将对大气CO2含量造成巨大的反馈。全球约有1 500 Gt的有机碳储存在土壤中,土壤有机碳的迁移转化一直以来是学者们关注的热点问题。土柱淋洗实验在农业、林业、环境科学等研究领域广泛应用,并在土壤溶质运移模拟、土壤水文性质、重金属和污染物迁移转化等科学研究中取得了大量的研究成果。土柱淋洗实验的设计细节直接关乎实验结果的真实性,存在一些不容忽视的问题,例如大孔隙的数量、优先流的特征等。本文总结了目前国内外土柱淋洗实验研究的现状,讨论了一些土柱淋洗实验设计的常见问题,并在回顾前人土柱淋洗实验研究的基础上,对土柱淋洗实验在研究土壤有机质迁移转化的应用前景做出了展望。

关键词：土壤有机碳土壤柱土柱淋洗实验实验设计综述

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

电动修复技术去除土壤重金属污染研究进展

引用

地球与环境 2022年第5期50卷 776-786页

作者：赵鹏肖保华中国科学院地球化学研究所环境地球化学国家重点实验室贵阳550081 中国科学院大学北京100049

电动修复技术可能是唯一可行的低渗透性污染土壤原位修复方法,受到广泛关注。本文尝试总结论述了电动修复技术去除土壤重金属污染的相关研究进展,介绍了电动修复技术的基本原理及局限性,探讨比较各种强化电动修复技术的方法,包括电极接... 详细信息

电动修复技术可能是唯一可行的低渗透性污染土壤原位修复方法,受到广泛关注。本文尝试总结论述了电动修复技术去除土壤重金属污染的相关研究进展,介绍了电动修复技术的基本原理及局限性,探讨比较各种强化电动修复技术的方法,包括电极接近法、交换电极法、离子交换膜、电场强化法(垂直电场、交流电场、脉冲电场)、试剂强化法(pH调节、螯合剂、表面活性剂),重点阐述目前新的螯合剂和表面活性剂的开发研究状况,以及电动修复目前主要的联用技术类型(电动-淋洗、电动-植物、电动-微生物、电动-可渗透反应墙)。此外,简要论述了电动修复对变价金属(Hg、Cr、As)的修复效果。最后在回顾总结该技术研究的基础上,对电动修复技术在去除土壤重金属污染的发展方向进行展望。

关键词：土壤重金属污染电动修复技术强化方法联用技术变价金属

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

记一件新见铭文铜戈

引用

中国国家博物馆馆刊 2012年第9期 83-84页

作者：胡保华罗孝武汉大学历史学院武汉430072 淄博市展览馆淄博255000

本文对一件新见铭文铜戈进行了简要介绍,认为其年代为战国中晚期,国别属齐。戈铭中的"乐成(城)"二字应系地名,地望待考。

关键词：铜戈铭文乐成(城)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Paleoenvironmental Records of Calcrete in the Three Gorges of Yichang,China

引用

地学前缘 2009年第S1期16卷 117-117页

作者： baohua Wei,Shangbin xiao,Jiacheng Zhao Three Gorges University,Yichang 443002,China.

Calcretes occur in a number of locations across the Yangtze Three Gorges in Yichang,central China. They represent the phase of Quaternary calcium carbonate cementation affected by the East Asian monsoon *** are situated at the relict fluvial terrace that were deposited within confined bedrock and limestone *** samples from separate terrace were singled out and dated by ESR.

关键词： calcretes SEM palaeoclimate Yangtze Three Gorges

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

肉质扁脑珊瑚的有性繁殖及早期发育

引用

热带海洋学报 2017年第1期36卷 65-71页

作者：肖宝华廖宝林杨小东谢子强广东海洋大学广东湛江524025 广东海洋大学深圳研究院广东深圳518108 深圳市碧海蓝天海洋科技有限公司广东深圳518108

在实验室养殖的条件下对肉质扁脑珊瑚Platygyra carnosus的有性繁殖进行初步观察,收集其排放的精卵进行受精,同时记录了肉质扁脑珊瑚早期发育各个时期的形态特征。观察结果表明,肉质扁脑珊瑚为雌雄同体,体外受精,在月圆后第9天开始出现... 详细信息

在实验室养殖的条件下对肉质扁脑珊瑚Platygyra carnosus的有性繁殖进行初步观察,收集其排放的精卵进行受精,同时记录了肉质扁脑珊瑚早期发育各个时期的形态特征。观察结果表明,肉质扁脑珊瑚为雌雄同体,体外受精,在月圆后第9天开始出现排卵现象,第11天排卵量达到最大。肉质扁脑珊瑚的卵为粉红色圆球形。在水温27?0.5℃的条件下,肉质扁脑珊瑚早期发育共经历5个发育阶段17个时期,受精卵经48h发育为浮浪幼虫,96h以后开始寻找基底进行附着。本研究为国内首次记录和报道肉质扁脑珊瑚的有性繁殖及胚胎发育过程,可以为石珊瑚的生态修复积累理论依据。

关键词：肉质扁脑珊瑚有性繁殖胚胎发育

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：