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选择某厂电镀车间作为研究区域,采集土壤、地下水、底泥和地表水样品,对样品的pH 值、铬、锌、砷、镉、铜、镍、铅和氰
化物含量进行了测试,分析了污染物在该区域内的分布特征。结果表明,研究区域土壤主要受到铬、锌、氰化物污染,43%采样点
土壤中锌浓度超出土壤环境质量标准三级标准,29%采样点土壤中总铬浓度超出三级标准。55%的采样点地下水受到锌和六价
铬污染。电镀车间污水排放口处土壤和地下水样品中均检测到一定浓度的氰化物。电镀车间架空区域下池塘1底泥和附近池塘
3底泥及地表水已经受到铬和锌污染。区域内污水池和污泥池铬、锌浓度则严重超标。元素污染物锌、铬和氰化物分别来源于电
镀液、电镀后铬酸盐钝化处理及前期采用的氰化物电镀工艺。在分析目前重金属元素污染场地修复技术基础上,建议研究区域采
用植物修复技术进行治理。 相似文献
化物含量进行了测试,分析了污染物在该区域内的分布特征。结果表明,研究区域土壤主要受到铬、锌、氰化物污染,43%采样点
土壤中锌浓度超出土壤环境质量标准三级标准,29%采样点土壤中总铬浓度超出三级标准。55%的采样点地下水受到锌和六价
铬污染。电镀车间污水排放口处土壤和地下水样品中均检测到一定浓度的氰化物。电镀车间架空区域下池塘1底泥和附近池塘
3底泥及地表水已经受到铬和锌污染。区域内污水池和污泥池铬、锌浓度则严重超标。元素污染物锌、铬和氰化物分别来源于电
镀液、电镀后铬酸盐钝化处理及前期采用的氰化物电镀工艺。在分析目前重金属元素污染场地修复技术基础上,建议研究区域采
用植物修复技术进行治理。 相似文献
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对于离子型或以离子键为主的晶体，其光学和磁学性质可用晶体场理论解释。通过晶场微扰矩阵元的计算，可定量地确定晶场光谱谱带位置。以往资料无矩阵元的计算过程，只是给出了部分积分结果，这不利于在任何对称情况下晶场微扰矩阵元的计算。推导了中心对称矿物的晶场势能算符，计算了积分值，得出了矩阵元以系数Aλx,r^2和r^4的表达式。并以绿松石的结构数据为基础，计算了Cu^2＋的晶场微扰矩阵元表达式中的系数Aλx,从而计算了各矩阵元，通过对称矩阵的对角化，最终求得绿松石中Cu^2＋d轨道能量和晶体场谱带位置计算值。与实验资料对比，符合较好。因此，用晶体场理论和实验资料相结合可定量地阐明具离子键晶体的呈色机制。 相似文献
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悬浮液进样—火焰原子吸收光谱法能快速、准确地测定样品中的微量元素,应用于测定蕨麻中的微量铜和锌,对试验条件、悬浮剂的选择进行了优化。试验测定铜、锌的精密度(RSD)分别为1.84%、1.46%,检出限分别为0.01μg/mL、0.027μg/mL。测定结果与消化法一致,相对误差分别为0.5%、0.9%,F检验表明两种样品处理方法无显著性差异。 相似文献
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绿松石呈色的晶体场理论计算 总被引：1，自引：1，他引：0
绿松石中Cu^2 电子组态为3d^9,为中心对称配位八面体，配位体为4个OH^-和2个H2O，在晶体场作用下，五重简并的d轨道分裂为5个能量不同的轨道，dx^2-y^2为基态，其余为激发态，依跃迁选律．从基态到四个激发态的跃迁为自旋允许跃迁，从而形成了铜离子吸收光谱的4条谱带。前人对绿松石中Cu^2 晶体场势能计算时，个别系数有误，笔者进行了修改，并补充了部分角度函数的积分值，从而使结果得到了改进，计算谱带位置与实测可见光吸收光谱谱带位置十分接近。在进行晶体场势能计算时，角度函数积分值是非常重要的，以往的资料只是直接给出了部分积分值，这在计算低对称配位八面体晶体场势能时是不够的，这次重新计算了所有可能的角度函数积分值，对各种对称下配位八面体晶体场能量的计算提供了可能。 相似文献
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镉一般与锌的矿物伴生,以硫化物或氧化物形式存在。镉是对人体健康有害的元素,因此对环境样品中镉的测定非常重要。常用的分析方法有火焰原子吸收光谱法、氢化物原子荧光光谱法和示波极谱法等。本文采用石墨炉原子吸收法测定地质样品中的镉。 相似文献
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Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
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Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter. 相似文献
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《极地研究(英文版)》2014,(3)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied 相似文献
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《山地科学学报》2014,(4):I0004-I0009
<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet. 相似文献
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《山地科学学报》2014,(4)
<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by 相似文献
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References： 《极地研究(英文版)》2007,18(1):73-83
Using the NCEP/NCAR reanalysis monthly 500 hPa height data on a 2.5 latitude-longitude grid and 1°×1° sea ice data,the polar vortex area,intensity index and arctic sea ice area index are calculated respectively,and the meridional distribution,period variation and the abrupts in the long range trend are analyzed to study their relationship.The results show that the meridional distribution of sea ice and polar vortex h-ave distinctive difference,the relative positions of them are different in the eastern and western hemispheres,and exept they have periods of 4 months,quasi half year,quasi year,4-5 years and 10 years commonly,and each of them has its own respective variation as well.The sea ice area is decreasing apparently since 1980's,so is the polar vortex area,but their abrupt changge time are different totally.The area of sea ice and polar vortex has prominent positive correlation,but the relationship of sea ice intensity,polar vortex intensity,polar vortex area is complicated. 相似文献
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The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature. 相似文献