KBrO3--KBr紫外分光光度法测定痕量苯酚

研究了HCl溶液中KBrO3-KBr紫外分光光度法测定苯酚的条件.建立了测定痕量苯酚的新方法.结果表明,在0.6 mol/L HCl,4.6×10-5 mol/L KBrO3,5.1×10-4mol/L KBr,5.7×10-4mol/L KI溶液中测定苯酚,其线性范围为0～120 mg/L,表观摩尔吸光系数为4.58×104L@mo1-1@cm-1,Sandell灵敏度为0.001 9μg/cm2.本法用于废水中苯酚的测定,结果满意.     

催化动力学分光光度法测定镨和钐

在盐酸介质中,痕量稀土元素镨和钐催化双氧水氧化碘化钾生成单质碘,单质碘可使次甲基蓝褪色,基于此建立了催化动力学分光光度法测定稀土元素镨和钐的新方法.方法的线性范围分别为5.1×10-6mol/L～5.1×10-5mol/L、5.1×10-6mol/L～5.1×10-5mol/L,检出限分别为2.75×10-6mol/L和2.44×10-6mol/L.该方法用于含稀土的纳米材料中镨和钐的分析测定,结果满意.     

槐米中芦丁和槲皮素的毛细管电泳-电化学检测

用毛细管区带电泳 -电化学检测法测定了中药槐米中芦丁和槲皮素的含量。研究了电极电位、电解液酸度和浓度、电泳电压及进样时间等对电泳的影响 ,得到了较为优化的测定条件。以直径为 30 0 μm的碳圆盘电极为检测电极 ,电极电位为 0 .90V (vs .SCE) ,在 10 0mmol/L硼酸盐缓冲液 (pH 9.0 )中 ,上述两组分在 10min内完全分离。芦丁和槲皮素浓度与电泳峰电流分别在 7.5× 10 - 7～ 1.0× 10 - 3和 5 .0× 10 - 7～ 1.0× 10 - 3mol/L范围内呈良好线性 ,检测下限分别为 4 .34× 10 - 7和 2 .2 5× 10 - 6 mol/L。 7次测定含 5 .0× 10 - 4 mol/L芦丁和槲皮素的试样溶液 ,峰高的相对标准偏差分别为 2 .5 6 %和 4 .11% ,五次测得的平均回收率分别为 97.80 %和 96 .84 %     

化学发光法测定痕量酚

基于在硫酸介质中 ,高锰酸钾与痕量酚之间反应能产生较强的化学发光的实验事实 ,建立了测定酚类的化学发光分析新方法 .该法线性范围为 8.0× 10 - 6- 2 .0× 10 - 4mol/L ;检出限为 1.2×10 - 6mol/L ;对 5.0× 10 - 5mol/L的苯酚进行连续 11次平行测定 ,相对标准偏差为 3.4 % .将该法应用于环境水样中酚含量的测定 ,结果良好 .     

呋喃妥因的伏安法测定

应用循环伏安法、微分脉冲伏安法对呋喃妥因在玻碳电极上的伏安行为及其测定进行了研究 .实验发现 ,在 0 .10 mol/ L的 HCl底液中 ,对其进行微分脉冲阴极溶出伏安扫描 ,于 - 0 .0 7V(vs.SCE)产生一还原峰可用于呋喃妥因的定量测定 .该还原峰的微分脉冲伏安峰电流与呋喃妥因的浓度在 5.0 0× 10 -7～ 3.0 0× 10 -5mol/ L范围内呈良好的线性关系 .对 1.0 0× 10 -5mol/ L的呋喃妥因溶液中进行 10次实验 ,该峰的峰电流相对标准偏差为 2 .6 8% .本方法检测限为 2× 10 -8mol/ L.     

Ru(phen)_3~(2+)-SO_3~(2-)-Ce(IV)体系化学发光法测定葡萄酒中的亚硫酸盐总量

提出了Ru(phen) 3 2 + -SO3 2 --Ce(IV)体系化学发光法测定溶液中亚硫酸盐的方法 SO3 2 -浓度与化学发光强度在 1 0× 10 -7～ 1 0× 10 -4mol/L范围内成正比 ,检出限为 1 97× 10 -7mol/L(S/N =3) ,1 0× 10 -4mol/LSO3 2 -溶液重复 6次测定结果的相对标准偏差为 4 9% 该方法用于测定白葡萄酒中亚硫酸盐总含量为 4 0 0 6× 10 -5mol/L ,加标回收结果令人满意     

聚组氨酸修饰电极测定多巴胺的研究

本文研究了多巴胺在聚组氨酸修饰电极上的循环伏安行为.在pH7.0的磷酸盐缓冲溶液中,用线形扫描伏安法测定多巴胺的线性范围为:6.0×10-8～1.0×10-5mol/L,1.5×10-5～1.0×10-3mol/L,检出限为4×10-8mol/L.用于药剂中多巴胺的测定,结果满意.     

单扫描示波极谱法测定邻甲基苯甲酸中的邻苯二甲酸

建立了极谱测定邻甲基苯甲酸中邻苯二甲酸含量的方法。在 6.4× 1 0 -2 mol/L H3 PO4-KH2 PO4( p H 1 .82 )缓冲溶液中 ,邻苯二甲酸极谱催化氢波的峰电位 EP为 - 1 .32 V ( vs. SCE) ,其二阶导数峰峰电流 i″p 与邻苯二甲酸浓度在 5 .0× 1 0 -7～ 4.0× 1 0 -5mol/L和 4.0× 1 0 -5～ 2 .0× 1 0 -3mol/L范围内呈线性关系。1 0次测量 1 .0× 1 0 -5mol/L邻苯二甲酸还原波二阶导数峰峰电流 ,相对标准偏差 RSD为 1 .7% ,5 0 0 ( w/w)倍邻甲基苯甲酸不干扰测定邻苯二甲酸时。     

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     

基于表面活性效应下微量镉的电化学测定

报道了在适量表面活性剂的存在下 ,钠型蒙脱石 (SWy - 2 )修饰碳糊电极高灵敏度测定环境体系中微量Cd2 + 的电化学方法 .该电极在HAc-NaAc (pH =5 .0 )溶液中 ,1.0× 10 -4mol/L的溴代十八烷基三甲基铵(STAB)存在下 ,用溶出伏安法测定Cd2 + ,在 - 0 .81V(vs ,SCE)处有灵敏的阳极溶出峰 ,且峰电流与Cd2 + 浓度在 2 .0× 10 -8～ 1.5× 10 -6mol/L的范围内 ,呈良好的线性关系 .该方法用于水样中镉的测定 ,检出限为 2 .0×10 -9mol/L .     

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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