3,5—二溴水杨醛缩邻氨基酚的单分子猝灭效应及测定痕量铜的研究

本文基于Cu(Ⅱ )与 3.5—二溴水杨醛缩邻氨基酚 (简称BSAP)和溴化十六烷基三甲胺 (CTMAB)形成络合物导致体系荧光猝灭的特性 ,提出了一种测定痕量铜的新荧光方法 .研究表明 ,试剂对表面活性剂呈现出单分子猝灭效应 (CMC浓度以下 )及胶束增敏作用 (CMC以上 ) ,单分子猝灭常数 6 .3× 10 5L/mol.该试剂对Cu(Ⅱ )具有高选择性 ,反应敏锐 .在 pH 3.8～ 4 .5的醋酸铵介质中及CTMAB存在下 ,Cu(Ⅱ )与BSAP形成 1∶1络合物 .该络合物的激发和发射波长分别为 35 5和 5 35nm ,其荧光猝灭程度与Cu(Ⅱ )量成正比 ,线性范围为 0～ 0 .3μg/ 2 5mL ,检测限为0 .2 3ng/mL ,方法用于大米中铜的测定 ,结果满意     

催化动力学荧光法测定铜(Ⅱ)

在硫酸介质中,在溴酸钾氧化罗丹明B的反应体系中,加入Cu(Ⅱ),能加速反应的进行,Cu(Ⅱ)对此褪色反应有催化作用,据此建立了测定微量铜的催化动力学荧光法.研究了影响催化褪色反应速度的最佳条件,在最优化条件下,Cu(Ⅱ)浓度在8×10~(-8)μg/mL～2×10~(-6)μg/mL范围内与荧光强度呈良好的线性关系,其相关系数为0.998 0,方法的检出限为2×10~(-8)μg/mL.对浓度为1×10~(-7)μg/mL的Cu(Ⅱ)标准溶液进行11次平行测定,得相对标准偏差(RSD)为1.2%,该法简单、快速、灵敏度高,已应用于自来水、茶叶中Cu(Ⅱ)含量的测定,回收率为96.3%～104.3%,结果令人满意.     

催化动力学光度法测定微量铜

研究了在氨—氯化铵介质中,Cu(Ⅱ)催化双氧水使中性红褪色反应,建立了动力学光度法测定微量Cu(Ⅱ)的新方法.在0.0~2.5μg/25mL范围内,Cu(Ⅱ)浓度与吸光度A值呈现良好的线性关系.检出限为4.52×10-7g·mL-1,该方法可用于河、湖水等样品中微量铜的测定.     

Cu(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Zn(Ⅱ)、Cd(Ⅱ)非有机溶剂液—液萃取行为的研究

本文研究了PEG—EBT—(NH_4)_2SO_4体系对Cu(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Zn(Ⅱ)、Cd(Ⅱ)的非有机溶剂萃取行为。指出在pH7～10(NH_3H_2O～NH_3Cl)的水溶液中,有(NH_4)_2SO_4存在下,Cu(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Zn(Ⅱ)可被PEG相几乎完全萃取,而Cd(Ⅱ)基本上不被萃取。从而获得了(d(Ⅱ)与Cu(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Zn(Ⅱ)混合离子的定量分离。     

用新的指示反应催化光度法测定痕量铜

本文研究了铜的一种新的指示反应。在氨水介质中,以硫脲为活化剂,Cu(Ⅱ)对加速过氧化氢氧化碱性品红褪色反应有强烈的催化作用,由此建立了一种测定痕量Cu(Ⅱ)的催化光度新方法。该法检测限为1.2ng/ml,测定范围为0—0.6ug/ml,应用于实际样品分析结果满意。     

反催化动力学光度法测定痕量铜

在酸性介质中,以K2S2O8为氧化剂,溴甲酚紫为指示物质,Cu(Ⅱ)强烈阻抑K2S2O8氧化溴甲酚紫褪色反应,褪色反应程度在一定范围内随Cu(Ⅱ)浓度增大而降低.据此建立测定Cu(Ⅱ)反催化动力学光度分析法,并确定了测定最佳条件,方法的线性范围为0.012~0.060 mg.l-1,检出限ε=3.3×10-5g.l-1.用于测定水系、蔬菜中的痕量铜(Ⅱ),结果满意.     

N—[4—氨磺酰苯基]—2—羟基—3—甲氧基苯甲亚胺与钴、镍、铜和锌配合物的合成及性质研究

本文报道了N—[4—氨磺酰苯基]—2—羟基—3—甲氧基苯甲亚胺(SHMB)与钴(Ⅱ)、镍(Ⅱ)、铜(Ⅱ)和锌(Ⅱ)的四个新配合物的合成,测定了它们的化学组成:M(C_(14)H_(13)O_4N_2S)_2,(M=Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)和Zn(Ⅱ).研究了配合物的摩尔电导、磁性、红外光谱、紫外可见光谱以及热谱等性质,并以SHMB和CU(SHMB)_2进行动物试验,初步结果表明Cu(SHMB)_2有一定的抗肿瘤活性.     

过氧化氢-茜素体系催化光度法测定痕量铜的研究

研究了催化动力学褪色光度法测定痕量铜(Ⅱ)的新体系,反应介质为NH3·H2O-NH4Cl缓冲溶液(pH=10.0),催化体系为痕量Cu(Ⅱ)催化H2O2氧化茜素的褪色反应.考察了反应体系的适宜条件、动力学性质及28种干扰离子的影响,建立了一种催化动力学光度法测定痕量铜的新指示反应.本法的线性范围为0～1.2×10-7 g/mL,其灵敏度远远高于普通光度法,检出极限为1.76×10-10g/mL,可应用于农产品和蒙药中铜的测定,相对标准偏差为1.1%～3.2%.     

8-羟基喹啉修饰电极测定铜的研究

本文研究了Cu(Ⅱ)在8-羟基喹啉修饰玻碳电极上的阳极溶出伏安特性。电极过程为不可逆过程。当底液为0.1MHAc-0.1MNaAc溶液,预电解电位为-0.6V(Vs.Ag-AgCl)时,铜的阳极溶出峰高比未修饰的纯玻碳电极提高约5倍。检出限可低至0.05ng/ml.150倍Cu(Ⅱ)浓度的Fe3+、50倍的Zn2+、Mn2+、Cr3+、Tl+,25倍的Co2+、Sn2+、Ni2+、Bi3+、Pb2+,5倍的Sb3+、Cd2+和2倍的Hg2+对铜的溶出峰不影响。本法测定了尿铜,对4ng/ml的Cu(Ⅱ)测得     

萃取动力学分析法的研究和应用 V 催化法测定痕量铜

本文研究了在酸性条件下,用二苯硫腙(H_2D_2)的四氯化碳溶液萃取Cu(Ⅱ)时,2,2'-联吡啶(dipy)活化Cu(Ⅱ)催化H_2D_2氧化褪色反应的机理;测定反应前后有机相H_2D_2的吸光度(620nm)的改变,建立了测定痕量铜的新方法检出限为10~(-9)g/ml,测定范围为1.25×~(-9)10-1.0×10~(-7)g/ml.可应用于水样、高纯试剂中痕量铜的测定,方法可靠,结果令人满意.     

Markedness and its Interpretation in Language Use

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.     

Features of Women's language

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

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.     

低渗透非均质砂岩油藏启动压力梯度研究

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。     

On Tragic Consciousness In The Works By Ernest Hemingway

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

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-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

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