催化动力学光度法测定痕量锰的研究

在pH11.50的Na_2HPO_4-NaOH介质中,Mn(Ⅱ)能催化KIO_4氧化镁试剂。据此建立了催化动力学光度法测定痕量锰的新方法。方法的线性范围为0.1-1.0μg/25ml,灵敏度为4.0×10~(-9) g/ml。将方法用于铝合金及环境水样中锰的测定,结果满意。     

催化褪色光度法测定痕量锰

在pH4.7的乙酸-乙酸纳缓冲液中,基于Mn2+催化高碘酸钠氧化夜蓝的褪色反应,建立了一种测定痕量锰的新的催化光度法.该方法的检出限为1.0×10-13g/mL,线性范围0.4～4.8μg/L,校正曲线方程△A=0.052+0.094CMn2+(μg/L),相关系数γ=0.9995.本方法用于水样中Mn2+的测定,结果满意.     

藏红O-高碘酸钾体系催化光度法测痕量锰的研究

本文研究了在pH5.2的NaAc-HAc介质中,痕量锰对高碘酸钾氧化藏红O反应的催化作用,建立了一个测定痕量锰的新方法,线性范围为0-0.4μg/25ml,检出限为1.51×10~(-10)g/ml,并用于铝合金标样,环境水标样中痕量锰的测定.     

双波长双指示剂催化动力学光度法测定几种中药中的痕量锰

Mn（II）在pH 5.6的KH2PO4-Na2HPO4介质中,对KIO4氧化碱性品红和灿烂绿有较强的催化褪色作用,通过分别测定544 nm和624 nm的催化与非催化体系的吸光度,建立催化动力学光度法测定中药中痕量Mn（II）的新方法.在最优条件下,测定锰的线性范围为6.00~84.0μg /L,检出限为4.6×10-9 g/mL.本方法选择性好,且体系比较稳定,用于艾叶、藿香、红花等中药中痕量锰的测定,结果满意.     

以亮绿为指示反应的催化光度法测定痕量锰

本文通过研究锰对KIO_4氧化亮绿的催化作用的适宜条件,建立了测定痕量Mn的分析方法,测定波长为460nm,符合比尔定律的范围是0.1～2.5ppb,检测限为3.8×10~(-11)g/ml,测定婴儿食品中锰含量得到满意结果。     

KIO_4—甲基紫—邻二氮菲催化光度法测定痕量锰

研究了在pH为4.80的缓冲溶液中,活化剂邻二氮菲存在时,锰(Ⅱ)对高碘酸钾氧化甲基紫褪色反应的催化效应及动力学条件,建立了分光光度法直接测定痕量锰(Ⅱ)的新方法。在80℃时其灵敏度为4.23×10~(-12)g/ml Mn,线性范围为0～70ng/25ml,方法简便,可用于茶叶中痕量锰测定。     

催化NaIO4氧化考马斯亮蓝G褪色光度法测定痕量锰

基于弱酸性条件下高碘酸钠能氧化考马斯亮蓝G褪色,锰对此褪色反应具有显著的催化作用,由此建立了催化高碘酸钠氧化考马斯亮蓝G褪色光度法测定痕量锰的新方法.锰含量在0.80～16.0μg/L范围内与△A值符合比尔定律,线性回归方程△A=0.0175 C_(Mn~(2+))(μg/L)0.014,r=0.9997,检出限为5.31×10~(-10)g/mL。该方法用于茶叶和人发中痕量锰的测定,结果满意。     

微波消解-催化动力学光度法测定茶叶中微量锰

利用微波消解法前处理样品,同时研究了在pH值为9.2的Na2B4O7-NaOH缓冲溶液介质中阳离子表面活性剂溴化十六烷基吡啶对Mn(Ⅱ)催化H2O2氧化二甲酚橙的褪色反应具有明显的增敏作用,建立了催化动力学光度法测定痕量Mn(Ⅱ)的新方法.该方法的线性范围为0.04~0.40μg/mL,检出限为0.009 6μg/mL.用于茶叶中微量锰(Ⅱ)的测定,回收率为98.3%~102.3%,结果令人满意.     

痕量锰的共沉淀分离富集和测定的研究

本研究了用PAN[1-(2-吡啶偶氮)-2-荼酚]共沉淀分离富集人发中的痕量锰．用微量注射进样火焰原子吸收光谱(FAAS)测定的方法。在pH10．5的试样溶液中．不需另加载体．PAN能定量地共沉淀痕量锰。溶液中锰的浓度在0-0．25μg／ml范围内时．标准曲线呈线性。人发中共存的其它元素不干扰测定。锰的标准加入回收率在96-104％之间。12次重复测定锰含量为2．72μg／g的发样的变异系数为4．8％。方法的特征浓度为1．0×10^-3μg／ml.本法简便稳定．用于人发中痕量锰的测定．获得了满意的结果．     

氯酸钾氧化铬天青S催化褪色光度法测定痕量锰

基于在加热和聚丙烯酰胺(PAM)存在下,Mn2+催化氯酸钾氧化铬天青S(CAS)的褪色反应,首次提出一种测定痕量锰的催化光度法.本方法的表观摩尔吸光系数ε 500=1.2×106L·mol-1·cm-1,校正曲线方程为△A=0.1612+0.05803CMn2+(μ g/L);线性范围0.10～10.0 μ g/L(r=0.9997);检出限4.0×10-11g/mL.对0.10和10.0μ g/L Mn2+测定的RSD分别为2.3%与3.4%.精密度好,操作简便、快速,可作为检测锰的一种可靠方法.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

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