CuFe2O4纳米粒子增敏Luminol-EDTA化学发光体系研究及应用

基于CuFe_2O_4纳米粒子能显著增强Luminol-EDTA体系的发光,首次建立了Luminol-EDTA-CuFe_2O_4 NPs化学发光新体系。紫外吸收光谱和化学发光光谱表明纳米CuFe_2O_4注入Luminol-EDTA体系后,未生成新发光物质,结合纳米CuFe_2O_4的特性,提出了CuFe_2O_4 NPs参与Luminol-EDTA体系可能的发光机理。研究发现芦丁能抑制Luminol-EDTACuFe_2O_4 NPs体系的化学发光,结合流动注射技术,将此化学发光体系应用于芦丁片中芦丁含量的测定。在优化实验条件下,芦丁浓度在2×10~(-8)~2×10~(-5) mol/L范围内芦丁浓度的对数和相对化学发光值呈线性,芦丁浓度检出限(LOD)为1.21×10~(-9) mol/L。将本方法应用于芦丁片中的芦丁含量测定,回收率为97%~102%,RSD为2.54%(c=1×10~(-7) mol/L,n=11)。     

流动注射化学发光法测定空气中的二氧化硫

在pH9.5 的Na2CO3-NaHCO3介质中,亚硫酸盐对Cu2 催化的Luminol-H2O2化学发光体系具有很强的增敏作用,对影响化学发光的诸因素进行了分析和探讨,建立了流动注射化学发光法测定亚硫酸盐的新方法,方法的检出限为2.3×10-9mol/L.亚硫酸盐的浓度在1.0×10-6-8.0×10-9mol/L范围内与发光强度增强值(ΔI)呈良好的线性关系.对1.0×10-7mol/L亚硫酸盐溶液平行测定11次,RSD为2.7%.该方法用Na2CO3作为吸收液成功地测定了空气中的二氧化硫.     

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.     

纳米银介质中头孢泊肟酯的化学发光特性及分析应用

在碱性环境中,纳米银能增敏鲁米诺-铁氰化钾体系化学发光信号,然而头孢泊肟酯的加入能使该反应发光强度显著降低。据此,提出了检测头孢泊肟酯的化学发光分析新方法,对其发光机理进行了初步研究。在选取的流路和实验条件下,该方法测定头孢泊肟酯的线性范围为8.0×10~(-9)~1.0×10~(-6)mol/L,方法检出限为4.5×10~(-9)mol/L。对1.0×10~(-6)mol/L和1.0×10~(-7)mol/L的头孢泊肟酯标准溶液平行测定11次,其RSD分别为1.6%和1.2%。方法应用于片剂中头孢泊肟酯的测定,结果满意。     

Zn(Ⅱ)和Cd(Ⅱ)对Luminol H_2O_2-Cr(Ⅲ)体系化学发光抑制作用的研究

对Luminol—H_2O_2化学发光体系中Zn(Ⅱ)、Cd(Ⅱ)抑制化学发光的作用及其影响因素进行了研究,建立了Zn(Ⅱ)、Cd(Ⅱ)的流动注射化学发光分析法,检出限Zn(Ⅱ)为2.0×10~(-8)mol/L,Cd(Ⅱ)为1.6×10mol/L,线性范围均为10~(-7)～10~(-4)mol/L。     

流动注射-鲁米诺-铁氰化钾化学发光体系测定环境水体中痕量2,4-二氯苯酚

基于中性介质中,2,4-二氯苯酚对鲁米诺-铁氰化钾化学发光体系有明显的增敏作用,提出了流动注射化学发光法测定痕量2,4-二氯苯酚的方法.在优化的试验条件下,2,4-二氯苯酚的化学发光强度与其浓度在1.0×10-7~1.0×10-5 mol/L范围内呈线性关系,方法的检出限(3S/N)为1.060×10-8 mol/L.对浓度为1.0×10-5mol/L2,4-二氯苯酚溶液连续测定11次,测定值的相对标准偏差为2.1%.取工业废水水样,经固相萃取后用该法测定其中痕量2,4-二氯苯酚含量,同行业推荐标准方法对比,结果相近.     

流动注射化学发光分析法测定维生素C

基于维生素C(Vc)与重铬酸钾的还原反应产生的铬(Ⅲ)能催化鲁米诺的化学发光的现象,建立了一种快速测定Vc的新方法.在最佳的实验条件下,该方法的线性范围为1.0×10-7~9.0×10-6mol/L,检出限为4×10-8mol/L,对1.0×10-6mol/L的Vc连续测定9次的相对标准偏差RSD为3.8%.     

流动注射-Luminol/Tween 20化学发光体系测定邻苯二酚

基于邻苯二酚对luminol-Tween 20化学发光体系的强烈的抑制作用,建立了一种简单、灵敏的luminol-Tween 20化学发光体系测定邻苯二酚的新方法。在最佳实验条件下,方法的检出限为5.0×10-10mol/L,线性范围为1.0×10-9mol/L～1.0×10-7mol/L,对5.0×10-8mol/L邻苯二酚进行平行测定11次,其RSD为4.1%。该方法可应用于自来水样中邻苯二酚的测定。     

均苯三酚的流动注射-化学发光分析法测定

在碱性介质中,高碘酸钾氧化鲁米诺产生化学发光,均苯三酚对此反应具有极强的增敏作用,据此建立了鲁米诺-高碘酸钾-均苯三酚化学发光体系测定均苯三酚的新方法.均苯三酚的浓度在2.0×10-7~1.0×10-5mol/L范围内与化学发光强度呈良好的线性关系,检出限为7.8×10-8mol/L,对1.0×10-6mol/L的均苯三酚11次测定的相对标准偏差为1.5%;并对河水中均苯三酚进行了测定,结果满意.     

铁氰化钾化学发光体系测定吲哚-3-乙酸

在碱性介质中,铁氰化钾可以直接氧化吲哚-3-乙酸（IAA）产生化学发光.基于此,结合流动注射分析技术,建立了一种化学发光测定IAA的新方法.该方法的线性范围为2.0×10^-7mol/L-1.0×10^-5mol/L,检出限为3.0×10^-8mol/L.对5.0×10^-7mol/L,1.0×10^-6mol/L,1.0×10^-5mol/L的IAA连续平行测定11次,测定的相对标准偏差分别为2.4%,2.5%和1.2%.将该法直接应用于土壤和池塘水中的IAA的测定,回收率在95.0%-104.8%之间.     

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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