流动注射—电位溶出分析法的研究：理论推导和验证

本文从理论上推导流动注射－电位溶出分析法的溶出时间方程。     

开放式旋转电极流动注射溶出分析薄层电解池测矿石中铅

本文研制了开放式旋转电极流动注射溶出分析薄层电解池,对其做了系统研究,并应用于矿石铅的测定,对其中各项因素做了试验和探讨,建立了开放式旋转电极流动注射溶出分析薄层电解池测定矿石中铅的方法。     

金膜电极电位溶出分析法测定锗

利用玻碳镀金膜电极电位溶出分析法测定锗，在ｐＨ９．８的硼砂—氢氧化钠缓冲溶液中，采用同步镀金膜，富集电位—１．３０ｖ（对Ａｇ／ＡｇＣｌ），以溶液中溶解氧为氧化剂，在－０．２０Ｖ和－０．８５Ｖ处出现两个溶出信号，取－０．８５Ｖ的溶出信号进行定量分析，锗的浓度在１．０×１０￣－５～１．０×１．０￣－７ｍｏｌ／Ｌ范围内与溶出信号有良好的线性关系，检出限为５．０×１０￣－８ｍｏｌ／Ｌ。该方法用于有机锗、康寿茶、蘑菇、牡蛎等样品分析，并用分光光度法作对照，标准回收率为９５．８％～１００．０％。     

电位溶出分析法和流动注射一电位溶出分析法测定Re—EDTA…

电位溶出分析法可间接测定配合物稳定常数。本文根据这一方法原理，首次采用双通道ＦＩＡ系统以及自制的静止电极壁喷式流池，分别用流动注射一电位溶出分析法和Ｐ．Ｓ．Ａ法测定了５种Ｒｅ－ＥＤＴＡ配合物稳定常数，并导出了一组ＦＩＰＳＡ法间接测定配合物稳定常数的公式。     

静止拟微分电位溶出分析法的研究

本文讨论了电位溶出分析的理论,提出了静止拟微分电位溶出的概念,并导出其理论方程式。该方程式描述了静止拟微分电位溶出的峰值,峰电位和其它参数的关系。另外还通过实验验证了理论方程式,并讨论了采样电位间隔AE的选择,汞浓度的影响,静止电位溶出中电容本底产生的原因及其扣除的方法等。     

静止拟微分电位溶出分析法的研究

本文讨论了电位溶出分析的理论,提出了静止拟微分电位溶出的概念,并导出其理论方程式。该方程式描述了静止拟微分电位溶出的峰值,峰电位和其它参数的关系。另外还通过实验验证了理论方程式,并讨论了采样电位间隔AE的选择,汞浓度的影响,静止电位溶出中电容本底产生的原因及其扣除的方法等。     

电位溶出分析和计时电位溶出分析及其应用

评述了电位溶出分析和计时电位溶出分析以及在其基础上发展产生的新方法的主要特征及其应用。     

计算机控制的电位溶出分析法的研究

电位溶出分析是近年发展起来的一种新的电分析化学技术。在电位溶出分析中,痕量金属首先电解富集在汞膜电极中然后通过溶液中氧化剂氧化溶出,并记录溶出过程的电位一时间曲线,这种方法操作简便,灵敏度高,元素之间干扰小。本文介绍了利用微型计算机控制的电位溶出分析系统,讨论了仪器的硬件结构和软件设计,利用微机实现了恒电位,自动存取分析方法和数据,分析过程自动控制,自动扣除电容本底和数据平滑,采用静止拟微分电位溶出方式使其灵敏度大大提高。富集五分钟最低可检测0.08ng/ml镉。在1ng/ml的镉离子和1ng/ml铅离子浓度下,连续测定11次,其相对标准偏差分别为3.8％和4.9％。     

计算机控制的电位溶出分析法的研究

电位溶出分析是近年发展起来的一种新的电分析化学技术。在电位溶出分析中,痕量金属首先电解富集在汞膜电极中然后通过溶液中氧化剂氧化溶出,并记录溶出过程的电位-时间曲线,这种方法操作简便,灵敏度高,元素之间干扰小。本文介绍了利用微型计算机控制的电位溶出分析系统,讨论了仪器的硬件结构和软件设计,利用微机实现了恒电位,自动存取分析方法和数据,分析过程自动控制,自动扣除电容本底和数据平滑,采用静止拟微分电位溶出方式使其灵敏度大大提高。富集五分钟最低可检测0.08ng/ml镉。在1ng/ml的镉离子和1ng/ml铅离子浓度下,连续测定11次,其相对标准偏差分别为3.8%和4.9%。     

电位溶出分析法测定商品鱼中的微量汞

1 前言鱼体中一般含微最汞,其食用容许含量为0.3mg/Kg以下。常规分析中,多采用光度法及原子吸收法。本文研究了用电位溶出法(PSA法)测定汞的适宜条件。试验表明,在pH2.83～5.02之间,0.075MNaCl为介质,3.00×10~(-4)MKMnO_4作氧化剂,有0.04mg/lCu(Ⅱ)作为敏化剂的条件下,用电位溶出分析法可测定鱼体中的微量汞。其结果与光度法一致。鱼中汞亦可用Wall—Jet电极电化学检测器的流动注射分析法测定,其结果与上述常规     

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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