催化荧光法测定食品中痕量铜

本文研究了在氨性介质中,铜(Ⅱ)催化过氧化氢氧化荧光素褪色,使其荧光减弱的指示反应.建立了催化荧光法测定痕量铜的新方法.方法检出限为0.1ng/ml,测定范围为0～0.14μg/25ml.方法简便快速,可直接用于食品中痕量铜的测定,结果满意.     

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.     

催化动力学光度法测定痕量铜--Cu(Ⅱ)-罗丹明B-H2O2体系

研究了在弱酸性介质中微量铜催化H2O2氧化罗丹明B褪色的指示反应,建立了催化动力学测定铜(Ⅱ)的新方法。方法检测限为1.5μg/L,测定的线性范围0-3.75μg/25ml,本法已用于人发样及水样中的痕量铜的测定。     

铜(Ⅱ)—麦塔喇红—过氧化氢体系催化光度法测痕量铜的研究

本文研究了在NH_3-NH_4Cl缓冲体系中,痕量铜(Ⅱ)催化过氧化氢氧化麦塔剌红的褪色反应。建立了一种测量痕量铜的新催化光度法,线性范围为0-120ng/ml,检出限为1.64×10~(-10)g/ml,并用于铝合金标样,环境水质标样和人发样中痕量铜的测定。     

催化动力学光度测定痕量铜的研究

本文发现了在氨性介质中,痕量铜催化过氧化氢氧化溴甲酚紫褪色的指示反应。研究了催化褪色反应的最佳条件和动力学参数,建立了测定痕量铜的新方法,方法的最低检测限为2.75×10~(-1)g/ml,测定范围0.2—1.0μgCu(Ⅱ)/26ml,用于测定人发中的Cu(Ⅱ),获得了满意的结果。     

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.     

催化动力学分光光度法测定超痕量铜(Ⅱ)的研究

在硫酸介质中,痕量铜(Ⅱ)能灵敏地催化高碘酸钾氧化靛红La褪色。系统地研究了指示反应的最优化实验条件,建立了测定痕量铜(Ⅱ)的新方法。方法检出限为4×10-12g/ml铜(Ⅱ)。方法检测范围0～0.1μg铜(Ⅱ)/25ml。用以测定矿泉水中的痕量铜(Ⅱ),获得了较好的结果。     

高灵敏度催化光度法测定超痕量铜I Cu(Ⅱ)-H_2O_2-MA体系

本文基于在氨性介质中,痕量Cu(Ⅱ)对H_2O_2氧化天青Ⅰ的褪色反应具有明显的催化作用.从而建立了一个测定痕量铜的新催化光度法,检出限为0.08ng/ml,线性范围为0-0.15μg/25ml.应用于环境标准样品,人发样,饮用水的分析均获得满意结果.     

催化动力学光度法测定微量铜——Cu(Ⅱ)-甲基橙-H_2O_2体系

研究了在弱酸性介质中微量铜催化 H2 O2 氧化甲基橙褪色的指示反应 ,探索了催化动力学测定铜 ( )的新方法 .该方法测定的线性范围 0 .0 5～ 3.5 μg/ 2 5 m L,本法已用于人发样及水样中的痕量铜的测定 .     

催化动力学光度法测定痕量铜

在弱酸性介质中,痕量铜可强烈地催化过氧化氢氧化灿烂绿的褪色反应,从而建立了测定痕量铜的催化动力学光度分析新方法.在最佳实验条件下,本法的检出限为8.6×10-9g/mL,线性范围为(0.0-0.2) μg/mL, 用于实际水样中痕量铜的测定,结果令人满意.     

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

正~~