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Pore water trace metal chemistry in polluted sediments of a tropical estuary of SE Brazil

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Chinese Journal Of Geochemistry 2006年第B8期25卷 66-67页

作者： Sambasiva Rao Patchineelam Edouard Metzger Didier J uel Gerard Sarazin Departamento de Geoquimica Universidade Federal Fluminense Niteroi Brazil Laboratoire de Geochimie des Eaux University Paris 7 France

Physico-chemical characteristics and heavy metal concentrations of copper mine wastes in Zambia:implications for pollution risk and restoration

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Journal of Forestry Research 2020年第4期31卷 1283-1293页

作者： Mutale N.Chileshe Stephen Syampungani emma Sandell Festin Mulualem Tigabu Abolfazl Daneshvar Per Christer Odén School of Natural Resources Copperbelt UniversityBox 21692KitweZambia Faculty of Forest Sciences Southern Swedish Forest Research CentreSwedish University of Agricultural SciencesBox 4923053 AlnarpLommaSweden Department of Biology Faculty of Basic Sciences and EngineeringGonbad Kavous UniversityShahid Fallahi StreetBasirat BlvdBox 163Gonbad-e-KavousGolestanIran

Soil characterization is a vital activity to develop appropriate and effective restoration protocols for mine wastelands while insights into the total content of heavy metals in the soil is an important step in estimating the hazards that the metals may pose to the vital roles of soil in the *** study addressed the following research questions:(1)To what extent do the physico-chemical characteristics vary between mine waste sediments and the nearby forest soil?(2)Are the concentrations of heavy metals high enough to be considered as toxic?and(3)Are heavy metals present in mine waste sediments potential sources of pollution?We hypothesized that the physicochemical characteristics of mine waste sediments are less favorably for plant establishment and growth while the concentrations of heavy metals are very high,thus restricting the success of revegetation of mine waste *** waste sediments were sampled following a diagonal transect across tailings dams,overburden dump sites and the local forest soil from the top layer(0-20 cm)using a closed *** were analyzed for arsenic,barium,lead,cadmium,cobalt,copper,chromium,nickel,vanadium,and zinc as well as for soil physico-chemical *** mine waste sediments were dominated by silt whilst the forest soil by sand particles,with significantly high bulk density in the *** the forest soil and overburden sediments were acidic than the alkaline tailings dam *** organic carbon and nitrogen contents were significantly low in mine wasteland substrates but the concentration of Ca and Mg were significantly higher in tailings dam substrate than the forest *** concentrations of available P,K and Na were similar across *** mean concentrations of heavy metals were significantly(pents than the forest soil;except for cadmium(p=0.213).The order of contamination by heavy metals on the tailings was Cu>Co>ba>Ni>As>Zn>Pb>Cr>V>Cd,and that on the overburd

关键词： Contamination factors Overburden material Phytostabilization Pollution load index Tailings dam

新型电响应型导电聚苯胺智能膜的制备及抗污染性能研究

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膜科学与技术 2018年第3期38卷 55-62页

作者：徐莉莉 emma Emanuelsson 王军中国科学院生态环境研究中心环境水质学国家重点实验室北京100085 英国巴斯大学化学与工程学院英国巴斯BA2 7AY 中国科学院生态环境研究中心高浓度难降解有机废水处理技术国家工程实验室北京100085 中国科学院大学北京100049

传统膜材料在制备成膜后,膜的选择透过性难以通过外界刺激进行在线智能化控制。基于此,本研究以导电聚苯胺(PANI)为膜材料,采用化学氧化聚合法将聚(2-丙烯酰胺-2-甲基-1-丙磺酸)(PAMPSA)引入到聚苯胺分子链结构中制备导电聚苯胺(PANI-PA... 详细信息

传统膜材料在制备成膜后,膜的选择透过性难以通过外界刺激进行在线智能化控制。基于此,本研究以导电聚苯胺(PANI)为膜材料,采用化学氧化聚合法将聚(2-丙烯酰胺-2-甲基-1-丙磺酸)(PAMPSA)引入到聚苯胺分子链结构中制备导电聚苯胺(PANI-PAMPSA),然后采用非溶剂致相转化法制备PAMPSA掺杂的聚苯胺膜,考察在电压作用下导电聚苯胺膜的电响应性能(选择透过性能的变化)以及抗污染性能.在电压作用下纯水和中性分子聚乙二醇(PEG)的膜过滤实验发现,外加电压可提高膜通量,对中性物质聚乙二醇的截留率降低约10%,这表明外加电压可在线调控导电聚苯胺膜的选择透过性.通过在电压作用下膜的抗污染性能研究发现,清洗液中的BSA浓度从30min的4.97×10^(-3) g/L增加到120min的5.39×10^(-2) g/L,膜通量恢复率为46.6%,说明外加电压可提高膜的抗污染性能.该导电聚苯胺膜将电化学与膜技术结合,通过外加电压在线调节膜的选择透过性,提供了清除膜污染的一种新思路,可作为一种膜生物反应器的新型抗污染膜材料.

关键词：聚苯胺电响应膜污染智能膜