十二烷基硫酸钠增敏动力学光度法测定间苯二酚

在pH=11.39的NH3-NH4Cl缓冲溶液及90℃水浴加热12min的条件下,阴离子表面活性剂十二烷基硫酸钠(SDS)存在时,间苯二酚对KIO4氧化间甲酚紫(m-CP)的褪色反应具有强烈的阻抑作用。据此建立了催化动力学光度法测定痕量间苯二酚的新方法。该方法线性范围为0.08～0.36μg/mL,检出限8.13×10-3μg/mL,可直接用于水样中痕量间苯二酚的测定,结果满意。     

痕量铜的阻抑动力学光度法测定

在酸性条件下,铜(Ⅱ)可催化空气氧化碘化钾生成碘,但当铜(Ⅱ)的质量浓度小于0.5μg/25 mL时有阻抑作用.利用铜(Ⅱ)对反应的阻抑作用建立测定痕量铜的动力学光度法,该方法的检出限量为0.005 3μg/L,线性范围为0~2.0μg/L.用于测定人发中的痕量铜(Ⅱ),结果满意.     

流动注射抑制化学发光法测定间苯二酚

基于碱性介质中间苯二酚抑制鲁米诺高碘酸钾单宁体系的化学发光,建立了反相流动注射抑制化学发光测定间苯二酚的新方法.该方法快速、准确、线性范围宽,测定间苯二酚的检出限为3.6×10-5g/L,方法的线性范围为8.0×10-5~4.0×10-3g/L,对于2.0mg/L间苯二酚测定11次的相对标准偏差为0.87%.应用于皮炎宁酊中间苯二酚的测定,结果令人满意.     

阻抑动力学光度法测定柠檬酸

在盐酸介质中,柠檬酸对痕量铁(Ⅲ)催化过氧化氢氧化酚藏花红的褪色反应有较好的阻抑作用,据此建立了阻抑动力学光度法测定柠檬酸的新方法。方法检出限为0.090μg/ml;线性范围为0.60-4.20μg/ml,直接应用于汽水中柠檬酸的测定,回收率为95%-104%,获得满意结果。     

阻抑褪色光度法测定微量锑(Ⅲ)

在pH=11.05的NH3-NH4Cl缓冲溶液介质中,痕量锑（Ⅲ）对过氧化氢氧化橙黄G的褪色反应具有阻抑作用,据此建立了阻抑褪色光度法测定微量锑（Ⅲ）的新方法,该方法的线性范围为0.10μg/25 mL~5.50μg/25 mL,检出限为6.36×10-4μg/mL,用于水中中微量锑（Ⅲ）的测定,结果满意。     

原子吸收分光光度法测定天然水及废水中的亚硝酸盐

本文报导了一种选择性好、灵敏度高的测量水体中亚硝酸盐的新方法——原子吸收间接测定法。方法是NO_2~-在酸性介质中与间苯二酚反应生成4-亚硝基间苯二酚,后者与Pd~(2+)进一步反应生成稳定的螯合物,经甲基异丁基酮萃取,分去水相,有机相吸入乙炔-空气火焰中,通过测定pd~(2+)的含量来间接测定NO_2~-的量。本法对NO_2~-的测定范围为0.04～1.0μg/ml,检出限为0.02μg/ml,NO_2~-的含量为0.2μg/ml的八次测定的变异系数为2.5%。30种异离子及有机物不干扰测定。对四种水样实测结果回收率在95～103%之间,变异系数在3.1%之内,适用于天然水、废水及浅色水样中亚硝酸盐的测定,结果令人满意。     

阻抑溴酸钾氧化二甲基黄光度法测定痕量钒

研究了痕量钒(V)阻抑溴酸钾氧化二甲基黄的褪色反应, 确定了最佳反应条件, 建立了一种光度测定痕量钒(V)的新方法.结果表明, 方法的检出限为2.3×10-10g/mL, 线性范围为0.40-4.0μg/L.用于化学试剂中痕量钒(V)的测定,结果满意.     

阻抑动力学分光光度法测定痕量碘

研究了在稀硫酸介质中,痕量碘离子对亚硝酸根催化溴酸钾氧化百里香酚蓝的阻抑作用,建立了测定痕量碘离子的阻抑动力学光度分析的新方法.测定碘离子的线性范围为:0～0.32μg/mL,检出限为8.96×10-8g/mL.用于药品中的微量碘的测定,结果满意.     

阻抑甲基红褪色动力学光度法测定微量氟

在稀硝酸介质中,邻菲咯啉存在下,微量F~-对H_2O_2氧化甲基红的褪色反应有显著的阻抑作用,据此建立了测定微量氟的阻抑动力学光度分析法.方法的线性范围是0.5～5.0 μg/mL,检测限为3.8×10~(-2)μg/mL.     

原子吸收分光光度法测定天然水及废水中的亚硝酸盐

本文报导了一种选择性好、灵敏度高的测量水体中亚硝酸盐的新方法——原子吸收间接测定法。方法是NO_2~2在酸性介质中与间苯二酚反应生成4-亚硝基间苯二酚,后者与Pd~(2 )进一步反应生成稳定的螯合物,经甲基异丁基酮萃取,分去水相,有机相吸入乙炔-空气火焰中,通过测定Pd~(2 )的含量来间接测定NO_2~-的量。本法对NO_2~-的测定范围为0.04～1.0μg/ml,检出限为0.02μg/ml,NO_2~-的含量为0.2μg/ml的八次测定的变异系数为2.5％。30种异离子及有机物不干扰测定。对四种水样实测结果回收率在95～103％之间,变异系数在3.1％之内,适用于天然水、废水及浅色水样中亚硝酸盐的测定,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

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