催化动力学光度法测定痕量金

研究了在硫酸介质中 ,痕量金 (Ⅲ )催化溴酸钾氧化铍试剂Ⅱ褪色的指示反应及其动力学条件 ,据此建立一种新方法 ,该方法的检测极限为 1.2 4× 10 -11g/mL ,线性范围为0～ 0 .4μg/ 2 5mL ,用于样品的测定获得满意的结果     

乙基曙红分光光度法测定蛋白质

在pH3 5～4 0的NaAc HCl介质中,乙基曙红与蛋白质结合形成复合物,溶液颜色发生变化,最大吸收波长为548nm,比乙基曙红红移了28nm,并在520nm处产生最大褪色,其吸收或褪色作用均可用于蛋白质的分光光度测定.在最大吸收波长548nm处,蛋白质的浓度在0 23～20 0μg·mL-1(HSA)和0 25～17 5μg·mL-1(BSA)范围内与吸光度成正比,其表观摩尔吸光系数分别为1 33×106L·mol-1·cm-1(BSA)和1 26×106L·mol-1·cm-1(HSA);而在最大褪色波长520nm处测量,上述范围的蛋白质浓度也与褪色程度成直线关系,其表观摩尔吸光系数分别为2 02×106L·mol-1·cm-1(BSA)和2 06×106L·mol-1·cm-1(HSA),褪色光度法灵敏度更高.并且方法选择性好,用于尿液及人血清样品中总蛋白的测定,所得结果与考马斯亮蓝法基本一致.     

水中痕量锰的测定

本文研究了在NH3·H2O-NH4Cl介质中锰催化过氧化氢氧化苋菜红的褪色反应及其动力学条件,建立了测定痕量锰的新方法.该方法的检出限为5.6×10-4μg/mLMn,线性范围为0～1.8μg/25mL Mn,用于测定井水中痕量Mn,获得满意结果.     

间羧基苦胺酸偶氮变色酸与铜的显色反应研究

在磷酸介质中,Cu2+离子与间羧基苦胺酸偶氮变色酸反应生成络合比为12的稳定蓝色络合物,该络合物在663 nm处有最大吸收,其摩尔吸光系数为2.88×104L·mol-1·cm-1,Cu2+离子含量在0～25μg/25ml范围内遵守比尔定律,方法用于铝合金中铜含量的测定,铜的标准回收率在95%～102%之间,结果满意.     

催化氯酸钾氧化灿烂绿褪色光度法同时测定痕量铜和铝

基于加热和KHC6H4(COO)2-NaOH (PH=5.00)缓冲溶液存在下,铜、铝催化氯酸钾氧化灿烂绿的褪色反应,建立了催化光度同时测定痕量铜和铝的新方法。本法测定铜、铝的线性范围分别为0.04～0.40μg/L和0.40～2.0μg/L;检出限分别为3.6×10-12g/mL和1.2×10-11g/mL。方法简便、准确,并用于实际样品的测定。     

水中痕量铁测定方法的研究

基于Fe3+对KIO4氧化紫脲酸胺 (MX)褪色的催化效应 ,建立了一个催化动力学光度法测定水中痕量Fe3+的新体系 ;该方法具有较好稳定性和选择性 ,Fe3+的浓度在 4× 1 0 - 9～ 3.2×1 0 - 7g/ml范围内与体系的褪色效应成良好线性相关 ,检出限为 1 .0× 1 0 - 9g/mlFe3+;RSD≤ 2 .1% (c=5× 1 0 - 8g/ml,n =1 1 ) ;该方法用于化学试剂和水样中Fe3+测定效果比较满意     

催化动力学光度法测定痕量亚硝酸根

研究在稀盐酸介质中,亚硝酸根对溴酸钾氧化罗丹明B褪色的催化反应,建立测定痕量亚硝酸根的催化反应光度法.该方法测定亚硝酸根的最大吸收波长540nm,表观摩尔吸光系数为2.9×105L·mol-1·cm-1.方法检出限为8.27×10-10g·mL-1在0～6.5μg/25mL范围内符合比耳定律,用于水果、蔬菜、肉制品、罐头样品中痕量亚硝酸根的测定,结果满意.     

罂粟酸与铁（Ⅲ）的光度法研究

研究了Fe(Ⅱ)-罂粟酸-CTMAB体系的显色反应.在硫酸(pH=2～3)介质中,Fe(Ⅲ)-罂粟酸形成21的络合物,其最大吸收波长λmax＝430nm,ε＝3.1×104L/mol@cm,铁的含量在0μg/25mI～112μg/25mL范围内遵循比耳定律.     

铑(Ⅲ)一高碘酸钾一偶氮胭脂红B催化光度法测定痕量铑的研究与应用

在硫酸和热水浴中 ,Rh(Ⅲ )催化高碘酸钾氧化偶氮胭脂红B褪色 ,由此建立了测定铑的新催化光度法 .铑质量浓度在 0～ 1 1μg/2 5mL范围内符合比尔定律 ,检出限为 4 0 8× 10 - 9g/mL .对 1 0 μg/2 5mLRh(Ⅲ )测定的相对标准偏差为 2 2 0 % (n =11) .催化反应的表观活化能为 10 0 38 KJ/mol.考察了 4 0多种共存离子的影响 ,Os(IV)、Ru(Ⅲ )和Ir(IV)干扰 ,其它贵金属、有色金属和铁不干扰 .题示体系已用于某些催化剂和冶金产品中痕量铑的测定 ,结果满意 .     

催化褪色光度法测定食盐中微量碘

在NaH2PO4～Na2HPO4介质中,微量碘对高碘酸钾氧化孔雀绿褪色有显著的催化作用,因此可用动力学分析法测定微量碘,该方法检出限为6.1×10-8g/mL,线性范围为0.21～1.50μg/mL.用于食盐中微量碘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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