对氯苯重氮氨基偶氮苯与镉显色反应及应用

研究了对氯苯重氮氨基偶氮苯在TritonX-100存在下与镉的显色反应.在pH10.0的硼砂-氢氧化钠缓冲介质中,该试剂与镉形成2:1的橙色配合物,其最大吸收波长位于493nm处,表观摩尔吸光系数为1.21×105L.mol-1.cm-1,镉( )的浓度在0～1.0mg/L的范围内符合比耳定律.方法用于工业废水中微量镉的测定,结果满意.     

2,4-二溴苯重氮氨基偶氮苯的合成及其与镉显色反应的研究

本文报告了新显色剂2,4——二溴苯重氮氨基偶氮苯的合成、纯化及结构分析,并研究了试剂与镉的显色反应。研究结果表明:在TritonX—100的存在下,于pH10.0的Na_2B_4O_7-NaOH缓冲介质中,镉可与试剂生成1:2的橙红色配合物,配合物的λ_(max)=490nm,表观摩尔吸光系数ε_(490)=1.04×10~5L·mol~(-1)·cm~(-1)。镉量在0—0.8μg/ml范围内遵循比尔定律。方法用于铝合金样品及合成水样中痕量镉的测定,结果满意。     

安替比林基重氮氨基偶氮苯分光光度测定镉

本文介绍了安替比林基重氮氨基偶氮苯的合成,性质及其与镉显色反应的条件。在吐温—80存在下的 pH=10.5～12.0的缓冲介质中,镉与试剂形成1:2的红色配合物,最大吸收波长为530nm,摩尔吸光系数为2.11×10~5L/mol·cm,符合比耳定律的线性范围是0—18μg/25ml。使用所建立的方法,成功地测定天然水及人发中的镉。     

新显色剂3-氯-2-硝基-4-甲基苯基重氮氨基)偶氮苯的合成及其与镉的显色反应及应用的研究

本文报道了新显色剂3—氯—4(2-硝基—4—甲基苯基重氮氨基)偶氮苯的合成及其与镉的显色反应。在非离子表面活性剂Triton X—100存在下,于pH9.5的Na_2B_4O_7—NaOH缓冲溶液中,试剂与镉生成2:1的红色配合物,其配合物的最大吸收波长位于524nm处,表观摩尔吸光系数ε=1.34×10~5L·mol~(-1)~cm~(-1),镉量在0 12μg/25ml范围内符合比尔定律,方法曾用于标准水样及电镀废水中微量镉的测定,结果满意。     

2,4-二甲基苯基重氮氨基偶氮苯的合成及其与镉显色反应的研究

本文合成了新显色剂2,4-二甲基苯基重氮氨基偶氮苯，研究了该试剂与镉的显色反应．在非离子表面活性剂OP-10存在下，于pH11.5的硼砂一氢氧化钠缓冲溶液中，新试剂与钢生成2：1的稳定的红色配和物，其配合物的最大吸收波长位于530um处，表观摩尔吸光系数为1．29×105L·mol-1·cm-1，镉量在0-10μg／25ml范围内符合比尔定律．用本法测定了标准水样及铝合金标样中的微量钢，获得满意结果．     

新显色剂邻硝基苯重氮氨基偶氮苯与镉显色反应的研究及应用

本文研究了新显色剂邻硝基苯重氮氨基偶氮苯与镉的显色反应,在非离子表面活性剂Tri-tonX-100存在下,于pH9.7的硼砂—氢氧化纳介质中,该试剂与镉形成1:3的红色配合物,其最大吸收波长位于505nm处,摩尔吸光系数ε=9.13×10~4L·mol~(-1)·cm~(-1)。镉量在0—16μg/25m范围内符合比耳定律。方法用于铝合金和环境水样中镉的测定,结果满意。     

试剂的合成及应用--Ⅱ新显色剂2,6-二氯-4-氨磺酰基苯基重氮氨基偶氮苯的合成及其与镉的高灵敏显色反应

本文研究了新显色剂2,6一二氯-4-氨磺酰基苯基重氮氨基偶氮苯的合成和性质及其与镉的显色反应。在非离子表面活性剂TritonX-100存在下,于pH11.0的硼砂一氢氧化钠缓冲溶液中,显色剂与镉形成稳定的红色配合物,其最大吸收波长位于520nm,摩尔吸光系数为1.84×10~5l·mol~(-1) ·cm~(-1)。镉含量在0-10μg/25ml 范围内符合比尔定律,方法用于工业废水中痕量镉的测定,结果令人满意。     

2-羟基-4-磺酰氨基苯重氮氨基偶氮苯的合成及与钴的显色反应

研究了2-羟基-4-磺酰氨基苯重氮氨基偶氮苯(HSDAA)的合成及与钴的显色反应.在Triton X-100表面活性剂存在下,pH=9.0～11.0的Na2B4O7-NaOH缓冲溶液中,试剂HSDAA与钴(Ⅱ)生成2:1型深红色配合物,配合物的最大吸收峰位于λ=540 nm处,表观摩尔吸光系数为8.69×104L·mol-1·cm-1,ρ(Co2 )为0～480 μg/L时符合比耳定律.用拟定方法测定维生素B12中的微量钴,结果满意.     

4-硝基-4＇-偶氮苯基重氮氨基偶氮苯三氮烯合成及其与镍（Ⅱ）的显色反应

报道了新显色剂4-硝基-4＇-偶氮苯基重氮氨基偶氮苯三氮烯的合成及其与镍的显色反应。在聚乙二醇辛基苯基醚的存在下,pH=10．0的硼砂-氢氧化钠缓冲溶液中,该试剂可与镍发生显色反应,镍与其形成物质的量比为1：2型的墨绿色配合物,在588nm处有一最大正吸收,在453nm处有一最大负吸收。以453nm为参比波长,588nm为测量波长进行双波长测定,其摩尔表观吸光系数ε=2．0×10^5L／（mol·cm）,镍量在24～300μg／L范围内符合比尔定律,用拟定方法测定铝合金中微量镍,回收率达到了99．5％-101％。     

间氟苯重氮氨基偶氮苯的合成及其与镉(Ⅱ)配合物性质的研究

本文合成了新三氮烯试剂间氟苯重氮氨基偶氮苯,用元素分析和红外光谱进行了结构表征。研究了该试剂与镉形成配合物的最佳条件及配合物的性质,并利用该试剂与镉形成配合物的性质建立了光度法测定微量镉的新方法,成功地应用于实际样品中镉的分析。     

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.     

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     

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

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