茜素红S与硼砂相互作用及其分光光度法测定铜

研究了茜素红S(ARS)与硼砂之间的相互作用及在硼砂缓冲体系中Cu(Ⅱ)与ARS的显色反应.实验表明,ARS与硼砂结合形成了黄色配合物,使ARS的吸收光谱发生明显的紫移;在pH 9.20的硼砂缓冲体系中,Cu(Ⅱ)与ARS形成了配位比为1:4的红色配合物,其最大吸收波长为540 nm,ε=2.00×104L·mol-1·cm-1,ρ(Cu(Ⅱ))在0～0.96 μg/mL时符合比耳定律.方法用于铜合金中铜的测定,结果满意.     

荧光光谱法研究茜素红S与壳聚糖的结合反应

研究生物探针茜素红S和壳聚糖溶液的荧光光谱特征,用荧光光度法、分光光度法研究茜素红S与壳聚糖分子之间的结合反应,结果表明:其能量转移机制为非辐射能量转移,论证了茜素红S与壳聚糖结合作用为静态猝灭过程(Kq=2.958 1×1011L.mol-1.s-1).测定了其结合常数(KA=3.26×103)和结合位点数(n=102).     

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.     

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.     

荷移反应分光光度法测定咖啡因

研究了咖啡因和茜素红形成荷移络合物的反应．在pH7．5的水溶液中,咖啡因能与茜素红发生荷移反应,形成物质的量比为1：1的络合物．λmax=523．00nm,咖啡因在0．6—5．8mg／L的范围内符合比耳定律,线性回归方程A=0．00263＋0．1082c（c：μg／mL）,相关系数R=0．9987,ε=2．1×10^4L／（mol·cm）．荷移反应分光光度法试剂易得,可直接在水溶液中进行,操作简单,灵敏度高,重现性好．用于茶叶中咖啡因含量的测定,取得满意的结果．     

聚乙二醇辛基苯基醚增敏光度法测定茶叶中铅的含量

采用聚乙二醇辛基苯基醚增敏光度法测定茶叶中铅的含量.在邻苯二甲酸氢钾-氢氧化钠缓冲溶液中,铅与甲基百里酚蓝反应生成蓝色配合物,非离子表面活性剂聚乙二醇辛基苯基醚的加入大大提高了测定的灵敏度.分别研究了增敏剂用量、显色剂用量、缓冲溶液酸度、显色时间、反应温度对吸光度的影响.结果表明,最佳反应条件为p H=6.2的邻苯二甲酸氢钾-氢氧化钠缓冲溶液2 m L,0.5 g·L-1甲基百里酚蓝溶液4 m L,2 g·L-1的聚乙二醇辛基苯基醚1 m L,室温(25℃)下反应3 min.配合物的最大吸收波长为608 nm.铅(Ⅱ)含量在0-5.6μg·m L-1范围内符合朗伯-比尔定律,标准曲线的线性回归方程为:A=0.034 8 C(μg·m L-1)+0.158 9,相关线性系数为R2=0.999 7,由线性回归方程可得表观摩尔系数为1.8×104L·mol-1·cm-1.测得样品的相对标准偏差(RSD)为2.45%-3.59%(n=3),加标回收率为95.2%(n=3).国标规定茶叶中铅含量不超过5μg·g-1,实验测得茶叶中铅含量为65.28μg·g-1,严重超标.     

茜素红的电化学性质及应用

在 0 .2mol L的磷酸溶液中 ,茜素红有一灵敏极谱峰 ,其峰电位是 - 0 .2 0V (vs .SCE)。峰电流与茜素红的浓度在 5 .0× 1 0 -7～ 5 .0× 1 0 -5mol L范围内呈线性关系 (r =0 .9989) ,检测下限为 3.0× 1 0 -7mol L。利用线性扫描极谱法和循环伏安法研究了茜素红的电化学性质。     

镓与对乙酰基偶氮羧-m的显色反应及其应用研究

研究了对乙酰基偶氮羧-m与Ga(Ⅲ)的显色反应,建立了分光光度法测定镓的新方法.在pH=2.0的酸性介质中,镓与对乙酰基偶氮羧-m形成1:2的有色络合物,最大吸收波长位于681 nm,表观摩尔吸光系数ε681＝1.14×105 L·mol-1·cm-1,检出限为0.73 μg/L,线性范围为1.0～11.0 μg/25 mL.方法应用于煤和煤矸石中微量镓的测定,获得了满意的结果.     

邻氯苯基荧光酮分光光度法测定锰的研究

研究了在pH=8.00～10.0的硼砂缓冲溶液中,表面活性剂十六烷基三甲基溴化铵存在下,锰与邻氯苯基荧光酮发生显色反应,其最大吸收波长在570nm处,表观摩尔吸光系数ε570=9.6×104L·mol-1·cm-1,锰含量在0～2μg/10mL范围内符合比尔定律.该方法用于各种钢样中锰的测定,结果比较满意.     

Meso-四-(4-磺基苯基)-卟啉光度法测定铅的研究

研究了 meso-四-(4-磺基苯基)-卟啉(TPPS4)与铅的显色反应,在pH=11～13.5的碱性介质中,TPPS4与铅生成1 : 1络合物,λmax=470nm,ε＝3.28×105L·mol-1·cm-1,铅的含量在0～10μg/25ml内符合比尔定律,方法用于食品和水样中铅的测定,结果满意.     

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.     

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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