新显色剂四(4-甲氧基-4-磺酸基苯基)卟啉与铅(Ⅱ)的高灵敏显色反应的研究与应用

本文提出新显色剂四 (4 -甲氧基 - 4 -磺酸基苯基 )卟啉 (P -OCH3-TPPS4 )为显色剂 ,在弱碱性条件下 ,高灵敏度测定痕量铅的新体系。该方法灵敏度高 ,摩尔吸光系数为 2 86× 10 5L·mol 1·cm 1,对比度大 (△λ =50nm) ,配合物稳定 ,室温下可稳定 15h ,显色体系简单 ,不需加热 ,也不需加任何辅助试剂 ,配合物的λmax =4 6 8nm ,铅 (Ⅱ )在 0 - 12 μg/ 2 5mL符合比尔定律。应用本方法测定酒中铅 ,回收率在 97%～ 98 4 %     

meso-四-(3,5-二溴-4-羟基苯)卟啉分光光度法测定铅

meso-四(3,5-二溴-4-羟基苯)卟啉[T(DBHP)P],一种新的溴代卟啉可用作测定铅的试剂。当8-羟基喹啉存在时,铅可在碱性介质中迅速与 T(DBHP)P 反应生成配合物。该配合物的 Soret 带位于479nm,摩尔吸光率为2.4×10~5L/(mol·cm)。在25 ml 溶液中0～11μg铅符合比耳定律。本法的选择性显著高于未溴代的 meso-四(4-羟基苯)卟啉[T(4-HP)P]法。用本法通过碘化物-MIBK 萃取后测定了铁矿和金属锌中的铅,结果良好。     

meso—四—（3,5—二溴—4—羟基苯—卟啉分光光度法测定铅

meso-四(3,5-二溴-4-羟基苯)卟啉[T(DBHP)P],一种新的溴代卟啉可用作测定铅的试剂.当8-羟基喹啉存在时,铅可在碱性介质中迅速与T(DBHP)P反应生成配合物.该配合物的Soret带位于479nm,摩尔吸光率为2.4×10~5 L/(mol·cm).在25ml溶液中0～11μg铅符合比耳定律.本法的选择性显著高于未溴代的meso-四(4-羟基苯)卟啉[T(4-HP)P]法.用本法通过碘化物-MIBK萃取后测定了铁矿和金属锌中的铅,结果良好.     

铅(Ⅱ)—碘—乙基紫—聚乙烯醇体系显色反应的研究

本文对聚乙烯醇存在时,铅(Ⅱ),碘离子和乙基紫(EV)的显色反应作了研究。铅(Ⅱ)、碘离子和乙基紫的三元缔合物形成迅速,直接在水相中显色,操作简便。缔合物的组成为:P_b(Ⅱ):I~-:EV~+:1:4:2。表观摩尔吸光系数ε=2.67×10~5l·mol~(-1)·cm~(-1)。对缔合物晶体作了红外光谱,表明乙基紫的阳离子和四碘合铅阴离子是离子键结合在一起的。应用本法于金属锌和水样中微量的铅的测定,结果较满意。     

糠醛缩邻苯二胺与锰(Ⅱ)配合物的合成、表征及热分解动力学

合成了一种新的希夫碱配合物 [MnL(Ac) (H2 O) ]Ac·H2 O(L表示糠醛缩邻苯二胺 )。通过元素分析、IR、UV和摩尔电导分析等手段 ,对合成的配合物进行了表征 ,并用非等温热重法研究了锰配合物的热分解反应动力学。推断出第一步和第三步热分解动力学方程分别为 :dα dt=A·e-E RT·3 2 (1-α) 4 3[1 (1-α) 1 3- 1]- 1 ;dα dt=A·e-E RT·(1-α) 2 。     

银-2-[3,5-二溴-2-吡啶偶氮]-5-二乙氨基苯酚-十二烷基硫酸钠的显色反应

研究了在阴离子表面活性剂存在的条件下,银与2-[3,5-二溴-2-吡啶偶氮]-5-二乙氨基苯酚的反应条件。阴离子表面活性剂十二烷基硫酸钠能使Ag-2-[3,5-二溴2-吡啶偶氮]-5-二乙氨基苯酚配合物增敏,其最大吸收峰位于565nm处,摩尔吸光系数为6.4×10~4L·mol~(-1)·cm~(-1),在0～0.48μg/ml时符合比尔定律。试剂与Ag~+形成2:1的配合物。此方法用于纯铅及铅锑合金中银的测定,可获得满意的结果。     

稀土、苯氧乙酸与8-羟基喹啉三元固体配合物的表征及抑菌试验

在乙醇水溶液体系中合成 4种稀土苯氧乙酸与 8-羟基喹啉三元固体配合物 ,其通式为 RE (POA ) 2 · hq(RE=Nd、 Gd、 Dy、 L u;POA=苯氧乙酸根 ;hq=8-羟基喹啉 )。 4种配合物均溶于 DMF、 DMSO,但不溶于水、乙醇、乙醚和丙酮。除 Nd (POA) 2 hq为黄绿色粉末外 ,其它 3种为黄色粉末。摩尔电导 7.32 s· cm2 · mol- 1～ 8.36 s·cm2· mol- 1。对配合物进行 IR、U V、TG- DTA分析 ,表明各配合物的紫外光谱、红外光谱均相似 ;在紫外光区均产生 π- π跃迁吸收光谱 ;配合物热稳定性高于游离配体 ;随着稀土离子半径的减少 ,配合物分解温度升高而热稳定性增加。以马铃薯为培养基 ,在 30℃～ 37℃下观察各配合物 (浓度 :2 5 0× 10 - 6 、 5 0 0× 10 - 6 、10 0 0× 10 - 6 )对酵母菌的抑菌作用 ,二甲基甲酰胺为对照 ,重复 2次 ,结果抑菌环直径为 5 .7mm～ 12 .2 mm ;表明各配合物对酵母菌的生长有较强的抑制作用 ,并随配合物浓度增加而增加 ;配合物与配体 8-羟基喹啉的相差不大 ,但比稀土效果好     

α-吡啶甲酸铬配合物与EHPG作用的光谱研究

由α-吡啶甲酸和 Cr Cl3· 6 H2 O合成了α-吡啶甲酸铬配合物 (Cr(C6 H4 NO2 ) 3· 1/ 2 H2 O) ,用红外光谱、紫外 -可见吸收光谱、荧光光谱、元素分析表征了配合物结构 .在 p H7.4、0 .1mol/ L Hepes条件下 ,以 EHPG为转铁蛋白模拟物 ,观察了铬 ( )由α-吡啶甲酸铬配合物向 Cr- EHPG配合物的转化动力学行为     

Meso—四—（3，5—二溴—4—羟基苯）卟啉分光光度法测定废水中铅

利用溴代卟啉试剂T(DBHP)P分光光度法测定废水中的铅。在 0 .16mol/LNaOH介质中 ,铅与溴代卟啉试剂形成 1:2橙黄色配合物 ,最大吸收波长在 4 79nm ,表观摩尔吸光系数为 :2 .2× 10 5L·mol- 1·cm- 1。铅量在 0～ 12 μg/ 2 5ml内符合比耳定律 ,可用于废水中铅的测定 ,获得满意结果     

Zn(Ⅱ)-Morin配位吸附波的研究及应用

以桑色素(Morin)为配位体,研究了Zn(Ⅱ)与其形成的配合物在汞电极上的极谱行为和极谱波的性质,确定了Zn(Ⅱ)-Morin配合物的组成.在pH=4.7的0.1 mol·L-1HAc-NaAc底液中,Zn(Ⅱ)-Morin配合物在2.0次微分极谱图上产生良好的吸附还原波.其峰电位为-1.14 V,峰电流与Zn2+在7.5×10-8～4.3×10-6 mol·L-1的浓度范围内呈线性关系,最低检出限为7.5×10-8 mol·L-1.用于实际样品测定,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.     

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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