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101.
Experimental study on metallation of tetrapyrroles in biphasic systems showed that complexation with metal cations of the first transition series is a feasible under chemical environments similar to the naturally occurring ones. The metal transport from the aqueous media to the organic, which is a novel approach using naturally occurring fatty acids hydroxy aromatic compounds and thiols, is demonstrated. Selectivity between Ni2+ and VO2+ complexation is achieved under sulfurous rich conditions. The kinetic implications are discussed in view of their geoenvironmental applicability. 相似文献
102.
Li Xuqian 《吉林大学学报(地球科学版)》1989,(4)
土壤对重金属离子的吸附容量严格受H~+浓度的控制。本文通过试验探讨了H~+ 对Cu~(2+)——Pb~(2+),Cn~(2+)——Zu~(2+),Cu~(2+)——Hg~(2+)系统中Cu~(2+)吸附量的影响规律。当pHpH时,Cu~(2+)吸附量随pH值增大而减小。对于酸性土,pH=6.5(初始值)或7.0(平衡值),对碱性土,pH=5.5(初始值)或7.8(平衡值)。在pHpH_(ZPC)时,吸附模式具有完全不同的形式。 相似文献
103.
Statistical distribution models of multi-site binding equilibria have potential applicability in the study of acid-base and metal complexation chemistry of humic substances in soils, sediments, and natural waters. A mathematical derivation is presented for the general continuous model for the case of proton binding; computational methods are described for fitting numerically the parameters in such models. Among models considered are those based on nontruncated, truncated, and bimodal (mixed) distributions. Specific emphasis is placed on Gaussian distribution models. 相似文献
104.
对湘南多金属成矿区方解石的研究表明,产于钨矿床中的方解石以层状晶体发育为特征,晶体形态主要为{0001}和{012}+{1010},晶体表面具有菱形生长阶梯;产于铅锌矿床中的方解石一般不出现层解石,晶体形态主要为{2131},{0112}+{1010}和{0001}+{1010}+{0112},晶体表面平行纹发育;远矿正常灰岩内方解石晶体形态主要为{4041}。 相似文献
105.
将多元校正分析法应用于配位滴定中,以EDTA为滴定剂,玻璃电极为指示电极,饱和甘汞电极为参比电极。依据电位滴定原理,对混合三组分:Cu ̄(2+)、Cd ̄(2+)、Zn ̄(2+)、及Cu ̄(2+)、CO ̄(2+)、Ni ̄(2+)进行测定,各金属离子之间的△logK在0.04~2.34之间,计算误差一般小于土10%。 相似文献
106.
与碱性花岗岩有关的稀有稀土矿床 总被引:2,自引:0,他引:2
概述了含矿碱性花岗岩产出的地质背景,含矿岩体的主要特征。根据岩石中暗色矿物与主要成矿元素的关系,将碱性花岗岩矿床划分为3种矿化类型:含Nb(Sn)黑云母花岗岩;含Nb(Sn)、HREE钠铁闪石-钠闪石花岗岩;含LREE霓石花岗岩,并指出,碱性花岗岩矿床在我国北部边区和攀西裂谷带具有良好的成矿前景。 相似文献
107.
Abstract The northern Guangxi region is an important rare metal, rare earth metal and polymetallic metallogenic province. In the region there exist five metallogenic series and two metallogenic subseries, whose metallogenesis shows features of polycyclic spiral evolution throughout the geological history. As far as various cycles are concerned, mantle-derived ore substances were reduced while crust-derived ore substances increased from early to late times; in the whole geological evolutionary history, mantle-derived substances decreased gradually while crust-derived ones increased. Meanwhile ore element associations became more and more varied. In terms of space, mineralization migrated from the old basement outwards, i.e. from west to east during the Precambrian, and from north to south during the Phanerozoic, and again from east to west during the Yanshanian. 相似文献
108.
元素地球化学分类探讨 总被引:1,自引:0,他引:1
戚长谋 《吉林大学学报(地球科学版)》1991,(4)
在评述已有经典分类基础上给予了元素地球化学亲合性的明确概念。强调了阳离子与阴离子或与络阴离子(酸根)之间的选择结合的重要地球化学意义,并以其做为元素地球化学分类的依据,提出了分类的新方案。该分类方案将元素划分为:亲石元素、亲氧元素、亲硫元素、阴离子及两性元素和氢及惰性气体元素五个类。阐述了各类元素亲合规律的基本特征和元素亲合性与地质环境的关系。 相似文献
109.
Data from the super-deep wells(PS10,PS14 and YS1)led to the discovery of widespread met-al-bearing hydrothermal fluids (or hot brines) related to basic magmas in the Lower Tertiary clastic sequence in the Dongpu Depression .In terms of SEM and EDAX analyses, pore-casting thin section examination of sandstone ,the composition and forming temperature of fluid inclusions ,the trace ele-ment composition of mustone and kerogen and organic geochemical analyses, it is demonstrated that the hydrothermal fluids existing in the area studied are ejecting fluids, which have a close bearing on diagenesis and sedimentation, rather than intrusive veins along the tectonic fractures.The main indicators of hydrothermal activity are:(1)abnormal alteration of kerogen;(2) high-temperature altered mineral assemblage;(30abnormal distribution of hydrocarbons;(4) specific assemblages and abnormal contents of heavy metals in mudstone and kerogen;(5) specific composi-tion of complex compounds and assemblages of fluid inclusions in sandstone;(6) periodic basaltic magma activity.Results of geological observations and laboratory simulating experiments demonstrated that the hydrothermal fluids have a close bearing on hydrocarbon generation in the Dongpu Depression. Two aspects of the effect of hydrothermal fluids are noticed:hydrothermal hydrocarbon production and strong metal catalysis in oil and gas generation. 相似文献
110.
R. A. Crichton 《Geotechnical and Geological Engineering》1994,12(3):183-212
Summary The legislative framework within which the disposal of sewage sludge is managed in England and Wales and the methods employed are outlined. Those factors which affect management decisions are analysed and consideration is given to the environmental implications of those decisions. Sewage processes and sludge disposal are considered, and the problems, especially those of heavy metal contamination, are addressed. An indication is given as to how the Water Services Companies are likely to implement the more stringent controls on disposal. Finally, the future of sludge management in England and Wales is discussed.Abbreviations BAT
Best available technology
- BATNEEC
Best available technology not entailing excessive cost
- BOD5
Biochemical oxygen demand
- BPEO
Best practicable environmental option
- CBI
Confederation of British Industry
- CEST
Centre for Exploitation of Science and Technology
- COD
Chemical oxygen demand
- CSC
Customer Services Committee
- DAF
Dissolved air flotation
- DG
Director General
- DoE
Department of the Environment
- DS
Dried solids 相似文献