2.9—二甲基—1.10—邻二氮杂菲—荧光桃红法测定微量铜

光度分析法测定微量铜的方法较多。早在1952年就有人报导:由于2.9—二甲基—1.10—邻二氮杂菲结构的位阻效应,与铜(Ⅰ)具有特效性反应,成为测定微量铜的高选择性方法。但由于灵敏度不高(ε_(460)=7.9×10~3),使其应用受到限制。近些年来,在保持此法高选择性基础上进一步提高其灵敏度的工作有很大进展。我们采用铜-2.9—二甲基—1.10—邻二氮杂菲-荧光桃红缔合型三元络合物测定合金中的微量铜,灵敏度有很大提高(7.4×10~4),而且方法简便、快速、准确,使此法在实际应用中兼有高灵敏、高选择性的特点。     

4—[(5—氯—2—吡啶)偶氮]—1.3—二氨基苯分光光度法测定微量铜(Ⅱ)

本文研究了光度法规定微量铜的新方法,试剂5-Cl-PADAB能与铜发生灵敏的显色反应,生成二元络合物Cu(Ⅱ)-5-Cl-PADAB,选择性较高。在pH=4.6～6.2的邻苯二甲酸氢钾的缓冲体系中,试剂与铜形成橙红色络合物,最大吸收波长为535nm,摩尔吸光系数为4.5×10~4,络合比Cu(Ⅱ):5-Cl-PADAB=1:2,在0～18μg/25mL区间内符合比尔定律。在磺基水杨酸的掩蔽下,一般常见的30多种离子不干扰测定,该方法用于合金和矿样中微量铜的测定,结果令人满意。     

新显色5—（4—磺基—1—萘偶氮）—8—羟基喹啉与铜显色反应的？…

本文研究了显色剂５－（４－磺基－１－萘偶氮）－８－羟基喹啉与铜显色反应的条件，结果表明：在ＰＨ＝１２．５的介质中，显色剂铜生成了３：１黄色稳定配合物，利用褪色江度法，λｍａｘ＝５２９ｎｍ，ε＝３．７×１０＾４Ｌｍｏｌ＾－１ｃｍ＾－１，铜量在０－３５μｇ／５０ｍｌ范围内遵循比耳定律，方法选择性好，可用于铜合金中铜含量的测定。     

催化光度法测定痕量铜Cu(Ⅱ)—甲酚红—H_2O_2体系

本文研究了在氨水介质中,铜(Ⅱ)催化H_2O_2氧化甲酚红褪色新指示反应及其动力学条件,建立了测定痕量铜的新方法.方法具有高灵敏度和高选择性.线性范围为2 8ng/25ml.检测限为7×10~(-11)g/ml.方法应用于地下水和生物样中铜的测定,结果令人满意.     

过氧化氢—铜(Ⅱ)—蕃红花红0体系催化光度法测定超痕量铜

本文以氨—氟化铵缓冲溶液介质中过氧化氢氧化蕃红花红0褪色为指示反应,利用固定反应时间法,通过各种条件的选择,建立了催化光度法测定超痕量铜的新方法.测定范围为0.002～0.05μg/25ml 铜(Ⅱ).方法操作简单,选择性好,直接用于微量镁合金及人体发样中铜的测定,获得了满意的结果.     

多元络合物显色反应的研究(XIV)聚乙烯醇(PVA)—(口底)唑—Gu体系

我们报导了聚乙烯醇—(口底)唑—铜三元络合物光度法测定铜的反应条件和该络合物的组成,所报导的方法的灵敏度高,选择性好,显色快速,络合物颜色稳定,是分光光度法测定废水中痕量铜的新方法。     

N—2—羟在苄叉对氯苯胺及其铜配合物的合成

合成了新化合物席夫碱N－2－羟在苄叉对氯苯胺及对甲基苯氧基二硫代甲酸铜。用红外光谱对所合成样品进行了表征。将席夫碱分别与丙二酸铜,邻苯二甲酸铜,对甲基苯氧基二硫代甲酸铜及与二乙基二硫代氨甲酸铜4种铜盐配位后溶于乙醇中生长晶体。通过对所得晶体进行元素分析后发现,该席夫碱与4种铜 盐的配位方式不完全相同,由于邻苯二甲酸铜的螯合性能较强,只有一个席夫碱分子与其配位,而其他3种铜盐与席夫碱反应时,有2个席夫碱与铜离子配位,且席夫碱上的羟基取代了原理铜盐上的阴离子。     

濒危鱼类—北方铜鱼

铜鱼属鲤形目、鲤科,成熟个体的重量可达2-4公斤,是珍贵鱼类之一.我国的铜鱼共有三种:铜鱼Coreius heterodon(BIeeker)圆口铜鱼Coreius guichenoti(Sauvage et Dabry)和北方铜鱼Coreius septentrioalis(Nichols).铜鱼分布于长江和黄河水系,圆口铜鱼分布于长江上游的干流和支流中,而北方铜鱼仅分布于黄河水系,现今的北方铜鱼已达濒于灭绝的边缘.北方铜鱼体长形,圆筒状;头小,略扁平,吻较长,尖而向前突出;口小,下位,呈马蹄形,较宽;唇发达,在口角处有一对粗而长的触须,其末     

HCl溶液中2—疏基苯并咪唑和1—苯基—5巯基—四氮唑对铜的缓蚀作用

采用失重法、电化学极化曲线和电化学阻抗谱考察了0.5mol/L HCl溶液中2－巯基苯并咪唑（MBI）和1－苯基－5－疏基－四氮唑（PMTA）对铜的缓蚀作用。MBI和PMTA的加入使铜的自腐蚀电位正移，对铜电极的阳极腐蚀过程存在抑制作用，两者复配使用增强了对铜电极的阳极和阴极电化学过程的抑制作用，提高了铜电极膜电阻，从而具有较好的缓蚀协同效果。     

3,5—diBr—PADAP—Triton X—100光度法测定微量铜

本文系统研究了在表面活性剂TritonX－100存在下，3，5—diBr—PADAP与Cu（Ⅱ）的显也反应性能，提出了测定微量铜的新方法．在pH3．5HAc－NaAc缓冲液中，Cu（Ⅱ）与3，5-diBr-PADAP形成1：2配合物，其最大吸收波长为573nm，表观摩尔吸光系数为8．5×104，Cu（Ⅱ）含量在0～4μg／10ml范围内服从比耳定律．在确定条件下，大量金属离子不干扰，反应有较好的选择性．方法直接用于铝合金中微量铜测定，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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