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1.
研究了10个体系约100种不同条件下茜素紫的极谱行为,在不同体系、不同条件下,茜素紫表现出来的极谱峰数目不同。在较高酸度下,一般表现为一个一阶导数波,峰电位较正;在较低酸度下,一般表现为多个一阶导数波,峰电位较负。极谱峰是茜素紫在汞电极上吸附还原产生的,而且峰电流与茜素紫的浓度在一定范围内成线性关系。 相似文献
2.
本文提出了导数极谱法测定微量锗的体系,在Hcl-Sb(Ⅲ)-Mo(Ⅵ)-丙酮-丁酮体系中,Ge(Ⅳ)和Mo(Ⅵ)形成三元杂多酸,在示波极谱仪上,该三元杂多酸的峰电流与所加入的锗量成线性关系,峰电位为-0.41V(VS.SCE)。研究表明,此波属于杂式酸吸附波。 相似文献
3.
在pH7.30的KH2PO4-Na2B4O7·10H2O缓冲介质中,锑(Ⅲ)与7-碘-8-羟基喹啉-5-磺酸(Ferron)生成络合物,在线性单扫描示波极谱仪上出现一尖锐、灵敏的极谐波,二阶导数峰电位Ep=-0.83V(vs.SCE),峰电流与锑(Ⅲ)浓度在3.0x10-8-4.9x10-6mol/L范围内呈良好线性关系,检出限为1.2x10-8mol/L。采用多种电化学方法研究了极谱波的性质及电极反应机理,证明了该极谱波为络合物吸附波,络合物组成为Sb(Ⅲ):Ferron=1:2,峰电流由络合物中心离子Sb(Ⅲ)还原产生。试验了多种离子对峰电流的影响,周巯基棉分离干扰离子,采用本法对标样进行测定,结果满意。 相似文献
4.
稀土与茜素紫固体配合物的合成及药理作用 总被引:3,自引:0,他引:3
报道了7种稀土离子(Ⅲ)与茜素紫生成的二元固体配合物的合成方法。通过元素分析,红外光谱、紫外光谱、核磁共振光谱、差热分析、摩尔电导和溶解性能等测定,确定了配合物的组成,并对其药理作用进行了研究。 相似文献
5.
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
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.
介绍了NaOH溶液中(pH>11)利用胆绿素的阳极波的极谱分析方法,研究发现胆绿素在-0.40V(VS.SCE)左右产生一灵敏、稳定的极谱阳极波,该波的二阶导数与胆绿素溶液的浓发在2×l0 ̄(-7)~1.8×l0 ̄(-6)mol·L ̄(-1)范围内成线性关系,其检测限为8×l0(-8)mol·L ̄(-1),并且在胆红素或0.02mg·L ̄(-1)白蛋白共存时无干扰,可用于胆绿素的测定,并对胆绿素的极谱阴极波和循环伏安图进行了研究,考察了胆绿素在-0.40V(VS.SCE)处的可逆波和-0.98V(VS.SCE)处的过氧化氢催化波的性质,对胆绿素的电化学反应提出了可能的机理。 相似文献
8.
在 p H = 7.7 的 B R 缓冲溶液中,铀(Ⅵ)与偶氮胂(Ⅲ) 反应形成配合物,于- 0.73 V(vs. S C E)处产生一灵敏吸附极谱波.检测下限为 8.0×10- 9m ol· L- 1,测得铀(Ⅵ)与偶氮胂(Ⅲ)的配合比为 1∶1.配合物稳定常数 1.12×107,配合物还原的电子转移数为 2.用该法测定了水样中的铀含量,结果满意 相似文献
9.
报道KIO3存在下牛血清白蛋白(BSA)的新型极谱催化波。在0.1mol.L^-1Na2HPO4^-KH2PO4(pH6.8)缓冲介质中,BSA于-0.60V(vs.Ag/AgCl)处产生一个可逆的极谱还原波。用极谱电流法测定BSA还原波的电子数,证实该波的BSA中的两个双硫键还原所致。 相似文献
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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.
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.
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well. 相似文献
14.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation. 相似文献
15.
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
16.
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
17.
Miao Maosheng 《华南师范大学学报(自然科学版)》2014,(6)
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
18.
Yang Weitao 《华南师范大学学报(自然科学版)》2014,46(6):137-138
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
19.
Bernard Kirtman 《华南师范大学学报(自然科学版)》2014,(6)
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
20.
《上海师范大学学报(自然科学版)》2014,(5):550
<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