镍—亚硝基R盐的络合物吸附波研究及应用

在含氯代十四烷基吡啶的NaCO3-NaHCO3(pH 9.70)缓冲溶液中,镍与亚硝基R盐形成的络合物在-0.64V(vs. SCE)处有一灵敏的络合吸附波,峰电流与镍离子的浓度在3.4×10-9 mol/L～3.74×10-6mol/L范围内呈线性关系,相关系数(r)0.999 4.检出限为1.4×10-10 mol/L(80 ng/L).方法用于水样和生物样品中微量镍的测定,结果满意.并探讨了络合物的电极反应机理.     

吸附伏安法同时测定中草药中痕量的镍和钴

提出一种有效的测定痕量镍和钻的吸附伏安法。利用悬汞电极作为工作电极,在0.005mol/L NH_3～0.06 mol/L NH_4Cl—3.0×10~(-6)mol/L锌试剂的最佳底液中,测定镍和钴的线性范围分别为1×10~(-10)～8×10~(-8)mol/L和1×10~(-10)～1×10~(-7)mol/L,检测下限均为5×10~(-11)mol/L。在工作中探讨了镍、钻和锌试剂配合物的吸附伏安行为及其在电极表面上的电化学反应机理。研究证明,该方法灵敏、可靠、省时,特别适用于中草药中痕量镍和钴的定量分析。     

钴-亚硝基R盐体系的电化学研究

钴(Ⅱ)与亚硝基红盐(NRS)、氯代十四烷基吡啶(TPC)所形成的三元络合物在示波器极谱仪上产生一灵敏的二阶导数极谱波,比没有TPC存在时,峰高增加近20倍.在7.0×10-10～6.0×10-6mol/L的范围内,钴(Ⅱ)的浓度与峰电流有良好的线性关系,检出限为1.4×10-10 mol/L(8.0 ng/L).研究了络合物的电化学行为,经计算得到Co(Ⅲ)-NRS-TPC三元络合物的配比为136,稳定常数为6.5×1037,三元络合物在电极表面的吸附符合福兰克林方程,吸附系数(β)为1.21×105 L/mol,饱和吸附量(Гs)为9.8×10-10 mol/cm2,吸引因子(v)为0.96.     

玻碳电极吸附伏安法测定痕量钴的研究

报道了采用玻碳电极测定钴的吸附伏安法 .通过在含 2 - (5 溴 2 吡啶偶氮 ) - 5 -二乙氨基苯酚 (5 Br PADAP)的 0 12mol/LNaOH溶液中于 - 0 5 0V富集时 ,钴 (Ⅱ )与配体 5 Br PADAP生成的络合物吸附于电极表面 ,然后进行阴极极化扫描 ,于 - 0 85V左右获得一灵敏的溶出峰 ,二次导数峰电流与钴 (Ⅱ )浓度在 5 0× 10 - 10 ～ 1 0× 10 - 7mol/L范围内呈线性关系 ,检出限达 2× 10 - 10 mol/L .同时 ,对电极反应机理进行了探讨 .方法应用于测定VB12 注射液中的钴 ,结果满意     

L-半胱氨酸修饰银电极用于测定食品包装塑料中的锡

采用自组装方法,通过L-半胱氨酸分子中的硫与银基底较强的亲和性,L-半胱氨酸在电极表面吸附并定向排列形成单分子层,得到L-半胱氨酸修饰银电极.循环伏安实验表明银电极表面自组装上L-半胱氨酸后,灵敏度明显提高,在0.2 mol/L HAc-NaAc(pH=5.0)缓冲溶液中研究Sn(Ⅱ)的伏安特性,由于Sn(Ⅱ)与电极表面L-半胱氨酸的吸附富集作用,在-37.5 mV产生一个灵敏的还原峰,其峰电流与Sn(Ⅱ)浓度成线性关系,线性范围为5.0×10-10～1.0×10-6mol/L,检测下限可达1.0×10-10mol/L.测定食品包装塑料中的锡,获得与原子吸收法一致结果.     

电聚合四氨基酞菁金属配合物修饰的碘离子化学传感器

用电化学方法将镍(Ⅱ) -,,,-四氨基酞菁或其它四氨基酞菁金属配合物单体聚合在铂丝电极上，制备成碘离子()的电位型传感器. 具有立体交联大环结构的聚合物膜在酸性溶液中发生质子化作用，使电极对呈现出选择性电位响应，线性范围为 2×10-6 ~ 1×10-1mol/L，检测下限为8×10-7mol/L，斜率为 (56±1) mV/p (20℃). 探讨了该电极的响应机理，用所拟定的方法测定了实际样品中碘的含量.     

2,9-二甲基-1,10-菲罗啉络合推动Ni~(2+)离子在水/硝基苯界面传递的研究

用半微积分伏安法研究了2,9—二甲基—1,10—菲罗啉(L)络合推动Ni(Ⅱ)离子在水/硝基苯界面的传递行为。在0.1mol/L NiCl_2(或NiSO_4)(W)—0.05mol/L TBATPB,L(NB)体系中,Ni(Ⅱ)与L生成NiClL~+(或NiL_2~(2+))络合离子,从而在W/NB界面发生离子传递。当C_(Ni~(2+))>>C_L,e_p与C_L成正比,线性范围为1×10~(-6)mol/L～5×10~(-4)mol/L,可作为L的定量分析。文中进行了理论探讨,测得了络合物的形成常数等。     

卟啉修饰电极的制备及金属离子的电位溶出行为

目的 :将修饰电极应用于电位溶出分析 .方法 :采用化学吸附法制备出meso -四 (对 -乙基苯基 )卟啉和meso -四 (对 -甲氧基苯基 )卟啉修饰玻碳电极 .研究Zn(Ⅱ ) ,Cu(Ⅱ ) ,Cd(Ⅱ )和Pb(Ⅱ )金属离子在该电极上的电位溶出行为 ,并与预镀汞膜玻碳电极、玻碳电极的电位溶出行为进行了比较 .结果 :溶出时间 (τ)与金属离子浓度均有良好的线性关系 ,最适宜分析的浓度范围是Zn(Ⅱ ) :1× 10 - 7～ 5× 10 - 5mol/L ;Cd(Ⅱ )和Pb(Ⅱ ) :6× 10 - 7～ 5× 10 - 5mol/L ;Cu(Ⅱ ) :5× 10 - 8～2× 10 - 5mol/L .微分电位溶出分析时灵敏度提高一个数量级 ,相对标准偏差为 0 .90 %～ 2 .3% (n=15) .结论 :使用卟啉修饰电极进行电位溶出分析可获得好的重现性和满意的灵敏度     

铜(Ⅱ)-2-(2,3,5-三氮唑偶氮)-5-二甲氨基苯甲酸络合物吸附波的研究及应用

研究了新试剂 2 (2 ,3,5 三氮唑偶氮 ) 5 二甲氨基苯甲酸 (TZAMB)与铜 (Ⅱ )的络合物极谱行为 .在 0 .0lmol/LKHP HNO3 0 .1mol/LKNO3 底液中 ,络合物Cu(Ⅱ ) TZAMB在 - 0 .0 9V (Vs.SCE)产生灵敏的阴极化二阶导数波 ,峰电流与Cu(Ⅱ )的浓度在 2 .0× 10 -7～ 2 .0× 10 -6mol/L范围内呈线性关系 ,检测限达 1.0× 10 -8mol/L .该法成功检测出食品中铜的含量 ,结果满意     

铅（Ⅱ）—Tiron络合物极谱吸附波研究

在0.56mol/L NaAc—0.04%Tiron 溶液中,铅(Ⅱ)与 Tiron 产生的络合物,在单扫描示波仪上可观察到一灵敏的极谱导数波,其峰电位为-0.49V(vs.SCE),峰电流与铅浓度在7.7×10~(-6)—6.8×10~(-6)mol/L 范围内成线性关系,检测限为3.8×10~(-(?))mol/L.应用该波测定了铜合金中的微量铅,结果良好,精密度和准确度均较满意,本文研究了形成铅-Tiron 络合物吸附波的条件,探讨了波的性质,用极谱法测定出其络合比为1:1.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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