选择性试剂2-(4-安替比林偶氮)-5-二甲氨基苯甲酸的合成及其分析应用

改变安替比林偶氮的取代基团 ,合成出一种新的选择性试剂 2 - (4 -安替比林偶氮 ) - 5 -二甲氨基苯甲酸(AADMB) ,并采用薄层层析法、元素分析法、红外光谱法和核磁共振波谱法鉴定 AADMB。建立以 AADMB为试剂的分光光度法测定 Pd( )。结果表明 ,在弱酸性介质中 Pd( )与 AADMB反应形成红色的配合物 ,常见金属离子均无较强的干扰 ,说明 AADMB是一种选择性较强的杂环偶氮试剂。在阳离子表面活性剂氯代十六烷基三甲铵存在下 ,该配合物的最大吸收波长在 4 85 nm ,表观摩尔吸光系数为 2 .0 4× 10 4 L· m ol- 1 ·cm- 1 ,钯量在 0～ 2 5 μg/ 2 5 m l内遵守比尔定律 ,检测极限为 0 .2 μg。建立的新分析方法应用于测定活性碳及石钯渣中的微量 Pd,测定结果接近活性碳及石钯渣中 Pd的标准含量 ,回收率分别为 96 %和 95 %。     

新显色剂PAPC与Cu(Ⅱ)-CTMAB的分光光度研究

研究了新显色剂 4 (2 吡啶偶氮 ) 邻苯二酚 (PAPC)在CTMAB存在下与Cu(Ⅱ )的显色反应 .在 pH =10 .5缓冲溶液中 ,该试剂与Cu(Ⅱ )反应生成稳定的红色配合物 ,其最大吸收波长为50 5nm ,表观摩尔吸光系数为 5.33× 10 4 L·mol- 1·cm- 1,铜含量在 0～ 1μg/mL范围内服从比耳定律 ,该方法应用于茶叶中铜的测定 ,结果令人满意     

非离子表面活性剂Tween-80存在下5-Br-PADAP分光光度法同时测定微量Cu(Ⅲ)和Fe(Ⅲ)

:在 p H3 .50酸性介质中 ,Cu( )和 Fe( )在非离子表面活性剂 Tween-80存在下与 5-Br-PADAP生成有色配合物 .有色配合物最大吸收波长都位于 570 nm处 ;表观摩尔吸光系数分别为 7.96× 1 0 4 L· mol-1· cm-1和 6.3 0× 1 0 4 L· mol-1· cm-1;Cu( )在 0～ 1 3μg/2 5ml,Fe( )在 0～ 1 8μg/2 5ml范围内符合比耳定律 .用拟定的方法测定了铝片和水样中的 Cu( )和 Fe( ) ,结果令人满意     

新试剂TZAMB光度法测定食品中的铜(Ⅱ)

本文研究了新合成的显色试剂 2 - (2 ,3,5 -三氮唑偶氮 ) - 5 -二甲氨基苯甲酸 (2 - (2 ,3,5 -triazolylazo) - 5 -dimethylaminobenzoicacid ,简称TZAMB) [1] 与铜 (Ⅱ )的显色反应。在 pH为 2 .5 2的 0 .0 1mol/LKHP -HNO3的底液中 ,铜 (Ⅱ )与TZAMB形成一种稳定的紫红色的络合物 ,其最大吸收波长位于 5 80 .0nm处 ,表观摩尔吸光系数为 4 .17× 10 4 L·mol- 1·cm- 1。络合物的组成为Cu2 +:TZAMB =1:2 ,铜的浓度在 0～0 .12 8mg/L范围内服从比耳定律。该方法成功的应用于食品中微量铜的测定 ,结果令人满意。     

新显色剂5-(8-喹啉侧氮)-2,3一二羟基吡啶分光光度法测定微量钴

用作者合成的新试剂 5 - (8-喹啉偶氮 ) - 2 ,3-二羟基吡啶作显色剂 ,以分光光度法测定微量钴 ,在 pH9 3的硼砂缓冲溶液中 ,配合物的最大吸收波长位于 6 2 4nm ,钴量在 0～ 2 0 μg/ 2 5ml范围内符合比尔定律 ,摩尔吸光系数为 9 0×1 0 4C·mol-1·cm-1.方法简便 ,快速 ,应用于维生素B12 和镍盐中钴的测定 ,获得满意结果     

非离子表面活性剂Tween-80存在下5-Br-PADAP分光光度法测定微量Cu(Ⅱ)和Ni(Ⅱ)

在pH 3.50酸性介质中 ,Cu 和Ni 在非离子表面活性剂Tween - 80存在下 ,与5-Br-PADAP生成有色配合物 ,其最大吸收波长位于 575nm处 ;表观摩尔吸光系数分别为7.97× 10 4 L·mol- 1 ·cm- 1 和 1.0 2× 10 5 L·mol- 1 ·cm- 1 ;Cu 在 0～ 0 .52mg·L- 1 ;Ni 在0～ 0 .4 8mg·L- 1 范围内符合比耳定律 .用拟定的方法测定了钢样中的Cu 和Ni 含量 ,结果令人满意 .     

对碘偶氮氯膦分光光度法测定微量铜

研究了对碘偶氮氯膦(CPA pI)与Cu2+ 的显色反应,在 pH5.0 的 NaAC HAc缓冲介质中形成紫色配合物,在610nm处测定配合物吸光度,其表观摩尔吸光系数为6.35×104L·mol-1·cm-1.该方法的检出限为0.03μg/mL,线性范围为0.1-2.4μg/mL,用于矿石样品中微量铜的测定,结果令人满意.     

偶氮二安替比林光度法测定铝合金中镍

本文研究了3,6—双[(安替比林)偶氮]—4,5—二羟基—2,7—萘二磺酸(偶氮二安替比林)与镍(II)的显色反应条件。在pH9的硼砂—盐酸缓冲介质中,试剂与镍(II)形成稳定的1:2的蓝色配合物,其最大吸收峰在632nm处,表观摩尔吸光系数为3.96×10~4L.mol~(-1)·cm~(-1),镍量在5—25μg/50mL范围内符合比耳定律,用于铝合金中镍的测定获得满意结果。     

新试剂CAPAQ的合成及其与钴的显色反应研究

以 8 氨基喹啉为母体合成了 5 [( 4 氯 2 胂酸基苯基 )偶氮 ] 8 氨基喹啉 (CAPAQ)并对其与钴的显色反应进行了研究 .在阳离子表面活性剂CTMAB存在下 ,于pH 9.6的硼砂缓冲溶液中 ,试剂与钴形成棕褐色配合物 ,其最大吸收波长位于 60 5nm ,摩尔吸光系数为 9.44× 1 0 4L·mol-1·cm-1,钴的量在 0～ 1 3μg/2 5mL范围内符合比耳定律 ,方法用于VB12 中钴的测定 ,结果满意 .     

2-(6-甲基-2-苯并噻唑偶氮)-5-二甲氨基苯甲酸与锰的显色反应的研究

用2 (6 甲基 2 苯并噻唑偶氮) 5 二甲氨基苯甲酸(MBTAMB)分光光度法测定微量锰。配合物的表观摩尔吸光系数为7.12×104L·mol-1·cm-1。配合物的最大吸收波长为684nm,Mn2+浓度在0-18μg/25mL范围内符合比尔定律。方法用于茶叶和食品中微量锰的测定,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.     

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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