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1.
用阳极溶出伏安法研究天然水中铅与有机物作用的特性   总被引:1,自引:1,他引:0  
将内蒙古的呼伦湖,中国南海北部的所有水样通过0.45μm过滤,用阳极溶出伏安法进行测定,在天然pH下,测定了铅的表观络合容量和条件稳定常数,呼伦湖的络合容量(C.C)比海水大,logK相近,海水的C.C极大值在表层,随深度增加而减小。  相似文献   

2.
用pH电位法研究了3-苯基偶氮-5-磺基水杨酸与过渡金属Cu(Ⅱ),Ni(Ⅱ),Co(Ⅱ),Zn(Ⅱ),稀土Nd(Ⅲ),La(Ⅲ)和Mo(Ⅵ)二元体系以及与Nd(Ⅲ)-EDTA混配体系在25℃,离子(ClO-14)强度为0.1molL-1时的络合行为.用SCOGS或SCOGS2程序计算了体系中存在的各种络合质点的累积生成常数;并讨论了滴定曲线,络合物的稳定性及络合质点平衡之间的转换  相似文献   

3.
用pH电位法研究了3-苯基偶氮-5-磺基水杨酸与过渡金属Cu(Ⅱ),Ni(Ⅱ),Co(Ⅱ),Zn(Ⅱ),稀土Nd(Ⅲ),La(Ⅲ)和Mo(Ⅵ)二元体系以及与Nd(Ⅲ)-EDTA混配体系在25℃,离子(ClO4^-1)强度为0.1mol·L^-1时的络合行为。用SCOGS或SCOGS2程序计算了体系中存在的各种络合质点的累积生成常数;并讨论了滴定曲线,络合物的稳定性及络合质点平衡之间的转换。  相似文献   

4.
在0.05mol/LNH4Cl溶液中。环丙氟哌酸与Cr(Ⅲ)发生络合反应,产生一个灵敏的还原波,峰电位为-1.640V(vs·Ag/AgCl),还原峰导数峰高与Cr(Ⅲ)在1×10-7~1×10-6mol/L范围内呈良好的线性关系。本文还用多种电化学方法和技术详细研究了Cr—CPFX的极谱伏安行为,实验结果表明,该波为络合吸附波。本文还测定了络合物的络合比和稳定常数,提出了电极反应机理  相似文献   

5.
烷基多胺与过渡金属离子Cu(Ⅱ)的络合研究   总被引:1,自引:0,他引:1  
研究了几种长链烷基多胺与Cu(Ⅱ)的络合物的最大吸收波长,络合比及络合物的稳定常数,结果表明,该类化合物可与Cu(Ⅱ)有效地络合,但络合物的稳定性和水溶性均比相应未取代的络合物的稳定性和水溶性差。  相似文献   

6.
在0.05mol/LNH4Cl溶液中,环丙氟哌酸与Cr(Ⅲ)发生络合反应,产生一个灵敏的还原波,峰电位为-1.640V(vs.Ag/AgCl)还原峰导数峰高与Cr(Ⅲ)在1×10^-7~1×10^-6mol/L范围内呈良好的线性关系,本文还用多种电化学方法和技术详细研究了Cr-CPFX的极谱伏安行为,实验结果表明,该波为络合吸附波,本文还测定了络合物的络合比和稳定常数,提出了电极反应机理。  相似文献   

7.
铜、锌与四(4-三甲胺基苯基)卟啉络合物极谱波均为络合吸附波,峰电位分别为E_(pCu络)=-1.22V(相对于SCE),E_(pZn络)=-1.47V.测定了络合比及条件稳定常数。  相似文献   

8.
鸦胆子油中三萜醇的分离和结构鉴定   总被引:1,自引:0,他引:1  
采用快速层析技术(FC)和络合快速层析技术(CFC)、质谱、红外光谱、气相色谱、化学衍生化并结合旋光度、熔点的测定,分离鉴定了鸦胆子油中7种三萜醇。  相似文献   

9.
合成了辛基羟丙基乙二胺,并研究与其Cu(Ⅱ)及Ni(Ⅱ)的络合性能,实验结果表明,该化合物在不同介质中能分别与Cu(Ⅱ)及Ni(Ⅱ)形成具有固定组成的络合物。  相似文献   

10.
用CuCl2·2H2O对抚顺页岩油柴油馏分(<360℃馏分)进行络合,然后将除去含氮等极性化合物的未络合分通过酸碱精制制成柴油产品,并将以含氮化合物为主的络合分制成缓蚀剂,从而提高了页岩油的利用价值.  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

14.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

15.
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-  相似文献   

16.
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-  相似文献   

17.
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that  相似文献   

18.
For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the  相似文献   

19.
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with  相似文献   

20.
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