二溴对甲氮胂与钯的显色反应及应用

研究了试剂二溴对甲偶氮胂与钯(Ⅱ)显色反应的最佳条件及其应用,建立了一种在水相中直接测定微量钯的分光光度分析方法.其表观摩尔吸光系数ε600=1.1×104 L· mol-1·cm-1,钯含量在0.5～3.5μg·mL-1范围内符合朗伯-比耳定律.     

5-Br-PADAP-TritonX-100双峰双波长分光光度法测定微量钒

以H2SO4为介质,在TritonX-100存在下,5-Br-PADAP与钒(V)生成紫色络合物,采用双峰双波长分光光度法进行测定,结果表明,试剂和络合物的最大吸收波长分别为470nm和600nm,钒(V)的含量在0～30μg/25mL范围内符合朗伯-比耳定律,表观摩尔吸光系数ε=3.76×104L·mol-1·cm-1,比单波长法(ε=1.77×104L·mol-1·cm-1)提高2.1倍,用于钢样中微量钒的测定,结果令人满意.     

5-Br-PADAP-TritonX-100双峰双波长分光光度法测定钢样中微量锰

采用双峰双波长分光光度法,在pH9.0的硼砂缓冲介质中,对5-Br-PADAP与锰(Ⅱ)生成的紫红色络合物进行测定.结果表明:试剂和络合物的最大吸收波长分别为440 nm和570nm,锰(Ⅱ)含量在0～10 mg·L-1范围内符合比尔定律.该法ε=1.79×105L·mol-1·cm-1,比单波长法ε=1.04×105L·mol-1·cm-1提高1.72倍,说明该试剂具有较高的灵敏度,用于测定钢样中微量锰得到满意结果.     

左氧氟沙星与四氯对苯醌的荷移分光光度法研究

研究了电子给体左氧氟沙星与电子受体四氯对苯醌之间的电荷转移反应,确定了反应的最佳条件.左氧氟沙星与四氯对苯醌在中性体系中,于室温下即可生成稳定的1∶1络合物.该络合物的λmax＝406 nm,表观摩尔吸光系数是1.0×104 L·mol-1·cm-1,左氧氟沙星浓度在2～30 mg·L-1范围内与吸光度呈线性关系.本方法用于测定药物制剂中左氧氟沙星的含量,结果满意.     

4,4'-对偶氮苯重氮氨基偶氮苯与溴化十六烷基三甲铵显色反应的研究及应用

研究了三氮烯试剂4,4'-对偶氮苯重氮氨基偶氮苯(BBDAB)与阳离子表面活性剂溴化十六烷基三甲铵(CTMAB)的显色反应,并据此反应建立了分光光度测定CTMAB含量的新方法.在Tritonx-100的存在下,于pH=12.5的缓冲溶液中,BBDAB与阳离子表面活性剂形成1∶3蓝紫色稳定络合物,其最大吸收峰位于680nm处,线性范围是0-14.6mg/L,表观摩尔吸光系数达1.76×104L·mol-1·cm-1.该法用于合成水样中CTMAB的测定,结果令人满意.     

溴百里酚蓝与维生素B1的水相显色反应及其分析应用

在聚乙烯醇存在的pH76～78的水溶液中,维生素B1(VB1)与溴百里酚蓝(BTB)反应,形成离子缔合物,此时溶液由墨绿色变为黄绿色.离子缔合物的最大吸收波长位于440nm,另在618nm有一更大的波谷,两者均可用于VB1的光度测定.当于440nm处测定时,表观摩尔吸光系数ε440=567×104L·mol-1·cm-1;当用褪色法于618nm处测量时,ε618=145×105L·mol-1·cm-1;如用440nm和618nm吸光度叠加时,ε440 618=202×105L·mol-1·cm-1.离子缔合物的组成比为VB1∶BTB=1∶1.据此提出了一种测定VB1的新的高灵敏水相分光光度法.方法简便快速并有较好的选择性.用于合成试样和维生素B1片剂的分析,结果满意.     

4,4''''-对偶氮苯重氮氨基偶氮苯与溴化十六烷基三甲铵显色反应的研究及应用

研究了三氮烯试剂4,4'-对偶氮苯重氮氨基偶氮苯(BBDAB)与阳离子表面活性剂溴化十六烷基三甲铵(CTMAB)的显色反应,并据此反应建立了分光光度测定CTMAB含量的新方法.在Tritonx-100的存在下,于pH=12.5的缓冲溶液中,BBDAB与阳离子表面活性剂形成1∶3蓝紫色稳定络合物,其最大吸收峰位于680nm处,线性范围是0-14.6mg/L,表观摩尔吸光系数达1.76×104L·mol-1·cm-1.该法用于合成水样中CTMAB的测定,结果令人满意.     

DCS-偶氮胂光度法测定微量铬(Ⅲ)

研究了新显色剂DCS-偶氮胂与铬(Ⅲ)的显色反应.在乙酸-乙酸钠缓冲介质中,在乳化剂OP存在下,试剂与铬(III)生成蓝紫色络合物,λmax=620nm,ε=2.46×104L·mol-1·cm-,铬(Ⅱ)量在5.0-50μg/25ml间符合比尔定律,络合比1 : 2.该体系灵敏度较高,选择性好,用于生物样品中铬(Ⅱ)的测定,结果满意.     

钛(Ⅲ)-甲基百里香酚蓝-NH3-NH4Cl反应体系的研究

研究了钛(Ⅲ)-甲基百里香酚蓝-NH3-NH4Cl反应显色体系的光度特性,并确定了测定钛的最佳条件.该体系在pH=9.00的NH3-NH4Cl缓冲溶液,配合物最大吸收位于602 nm处,钛浓度在0.010～1.60 μg·mL-1范围内遵循比耳定律,络合物组成Ti(Ⅲ)∶MTBC为1∶2,表观摩尔吸光系数ε=1.60×104 L·mol-1·cm-1,大多数共存物质的允许量大.据此提出了测定钛的新方法,且实验结果令人满意.     

显色剂偶氮胂Ⅲ直接吸光光度法测定微量镧

研究了显色剂偶氮胂III与镧的显色反应,在0.020 mol·L-1的盐酸介质中,试剂与镧生成绿色络合物,其最大吸收波长为650 nm ,摩尔吸光吸数为3.14×104 L·mol-1·cm-1 ,该方法灵敏度高,常见金属离子允许量大,选择性好. 在0.040～0.80μg·mL-1范围内符合比耳定律,其线性回归方程为A=0.237 1 cLa(III)( μg·mL-1) 0.00191,相关系数r=0.999 5.     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

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     

Call for Papers

<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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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