Ru(phen)32+-SO32--Ce(Ⅳ)体系化学发光法测定葡萄酒中的亚硫酸盐总量

提出了Ru(phen)32+-SO32+-Ce(Ⅳ)体系化学发光法测定溶液中亚硫酸盐的方法.SO32-浓度与化学发光强度在1.0×10-7～1.0×10-4mol/L范围内成正比,检出限为1.97×10-7mol/L(S/N=3),1.0×10-4mol/LSO32溶液重复6次测定结果的相对标准偏差为4.9%.该方法用于测定白葡萄酒中亚硫酸盐总含量为4.006×10-5mol/L,加标回收结果令人满意.     

Ru(phen)_3~(2+)-SO_3~(2-)-Ce(IV)体系化学发光法测定葡萄酒中的亚硫酸盐总量

提出了Ru(phen) 3 2 + -SO3 2 --Ce(IV)体系化学发光法测定溶液中亚硫酸盐的方法 SO3 2 -浓度与化学发光强度在 1 0× 10 -7～ 1 0× 10 -4mol/L范围内成正比 ,检出限为 1 97× 10 -7mol/L(S/N =3) ,1 0× 10 -4mol/LSO3 2 -溶液重复 6次测定结果的相对标准偏差为 4 9% 该方法用于测定白葡萄酒中亚硫酸盐总含量为 4 0 0 6× 10 -5mol/L ,加标回收结果令人满意     

三邻菲咯啉合亚钌-亚硫酸根-氯酸钾体系化学发光法测定葡萄酒中亚硫酸盐总量

提出了Ru(phen) 32 +-SO32 - -KClO3(phen =1 ,1 0菲咯啉 )体系化学发光法测定溶液中亚硫酸盐含量的方法 .SO32 - 浓度与化学发光强度在 1 .0× 1 0 - 6～ 1 .0× 1 0 - 3 mol/L范围内成正比 ,检出限为 2 .32× 1 0 - 6mol/L (S/N =3) ,1 .0× 1 0 - 4 mol/LSO32 - 溶液重复 6次测定结果的相对标准偏差为 3.8% .该方法成功地用于白葡萄酒中的亚硫酸盐总含量的测定 ,结果令人满意 .     

流动注射化学发光法研究PAN对鲁米诺-亚铁氰化钾反应的催化性能

1-(2-吡啶偶氮)-2-萘酚(PAN)对鲁米诺-亚铁氰化钾化学发光反应有良好的催化性能,实验结果表明:在1.0×10-5-1.0×10-7mol/L范围内,发光强度与PAN的浓度之间有良好的线性关系,检测极限为5.6×10-8mol/L。同时发现一些金属对此化学发光反应有强的抑制作用,为此建立了用此反应测定这此金属离子的新方法,测定Ni2+,Cr3+,Zn2+,Co2+和Cu2+的检测极限分别为1.0×10-9mol/L、1.0×10-8mol/L、1.0×10-8mol/L、5.0×10-9mol/L和6.0×10-9mol/L,相对标准偏差在1.28-3.10%(n=11)范围内。     

流动注射化学发光测定水体中痕量的铁

基于在甲醛存在下,高锰酸钾与Fe(II)在酸性介质中发生化学发光反应,建立了流动注射化学发光测定Fe(II)分析方法,该法测定Fe(II)的线性范围为(3.0×10-9～5.0×10-5mol/L),检出限为1.0×10-9mol/L,相对标准偏差为3.5%(1.0×10-7mol/LFe(II),n=11)。该法应用于测定水样中Fe(II),结果令人满意。     

毛细管电泳电化学检测葛根和葛藤中几种黄酮类化合物

用毛细管电泳电化学检测法测定了葛根和葛藤中葛根素、大豆甙元和芦丁含量.以碳圆盘电极为检测电极,电极电位为0.90V(vs.SCE),在50mmol/L硼酸盐缓冲液(pH9.0)中,使用长40cm熔融石英毛细管,当分离电压为9kV,上述三组分在12min内完全分离.葛根素、大豆甙元和芦丁浓度与电泳峰电流分别在2.5×10-6～1.0×10-3,1.0×10-6～1.0×10-3和5.0×10-6～1.0×10-3mol/L范围内呈良好线性,检出限(S/N=3)分别为3.4×10-7,2.4×10-7和5.1×10-7mol/L.7次测定葛根素、大豆甙元和芦丁的混合标准溶液,峰高的相对标准偏差分别为2.71%,2.47%和4.21%.     

聚茜素红薄膜修饰电极测定丹宁酸

以聚茜素红薄膜修饰电极(PARE)为工作电极,0.05 mol/LHAc-NaAc(pH 5.0)为支持电解质,通过差分脉冲伏安法研究了丹宁酸在修饰电极上的伏安行为.结果表明,当丹宁酸浓度在5.0×10-6~5.0×10-3mol/L范围内,丹宁酸的浓度与氧化峰电流成线性关系,线性方程为i(μA)=0.2768c(10-6mol/L)+2.636,r=0.9966,检出限达1.0×10-7mol/L.方法简便,用于茶叶中丹宁酸的测定,7次测定的RSD%为2.1.     

Ru(phen)32+-SO32+-Ce(Ⅳ)体系化学发光法测定葡萄酒中的亚硫酸盐总量

提出了Ru(phen)32+-SO32+-Ce(Ⅳ)体系化学发光法测定溶液中亚硫酸盐的方法.SO32-浓度与化学发光强度在1.0×10-7～1.0×10-4mol/L范围内成正比,检出限为1.97×10-7mol/L(S/N=3),1.0×10-4mol/LSO32溶液重复6次测定结果的相对标准偏差为4.9%.该方法用于测定白葡萄酒中亚硫酸盐总含量为4.006×10-5mol/L,加标回收结果令人满意.     

顺序注射化学发光联用技术测定DL-苹果酸的初步研究

基于硫酸介质中高锰酸钾直接氧化DL-苹果酸产生化学发光的原理,结合顺序注射进样技术,初步建立了测定DL-苹果酸的自动化方法.对进样顺序、体积、流速和浓度各因素进行了优化,在156μL进样体积下,方法的线性范围为1.0×10-4~1.0×10-2mol/L,检出限为(3σ)为5.0×10-5mol/L,方法的相对标准偏差为1.3%(5.0×10-3mol/L,n=11).采样频率为84个/h.     

化学发光法测定痕量酚

基于在硫酸介质中 ,高锰酸钾与痕量酚之间反应能产生较强的化学发光的实验事实 ,建立了测定酚类的化学发光分析新方法 .该法线性范围为 8.0× 10 - 6- 2 .0× 10 - 4mol/L ;检出限为 1.2×10 - 6mol/L ;对 5.0× 10 - 5mol/L的苯酚进行连续 11次平行测定 ,相对标准偏差为 3.4 % .将该法应用于环境水样中酚含量的测定 ,结果良好 .     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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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