萃取动力学分析法的研究和应用Ⅶ.催化法测定痕量Pd(Ⅱ)

本文研究了在PH3.0的条件下,邻二氮菲活化Pd(Ⅱ)催化氧气氧化双硫腙的慢反应,以萃取平衡控制反应时间和水相中双硫腙的浓度,通过测定反应前后有机相中的绿色(620nm)减退,建立了测定痕量Pd(Ⅱ)的新方法.方法的灵敏度为1.0×10~(-8)gPd(Ⅱ)·ml~(-1),线性范围为1.0×10~(-8)-5.0×10~(-7)gPd(Ⅱ)·ml~(-1).对干扰的金属离子可用萃取方法进行分离,对干扰的氧化性离子可用盐酸羟胺消除,将方法用于合成样品中Pd(Ⅱ)的测定,结果满意.     

钍(Ⅳ)与对硝基偶氮氯膦显色反应的研究

本文研究了钍(Ⅳ)与CPA-pN的显色反应,表明钍与配体的络合比为1:3,络合物在0—50μg/25ml呈线性关系,此蓝色络合物的最大吸收在680nm,摩尔吸光系数为7.55×10~4cm~(-1)·mol~(-1)·1。在有CTMAB或CTMAB及乙醇存在下,其ε_(680)分别为1.35×10~5和1.75×10~5cm~(-1)·mol~(-1)·1,0—17.5μg/25ml和0—15μg/25ml服从比尔定律。在有过量CTMAB存在下,Th(Ⅳ)与CPA-pN的络合比为1:6。试验了外来离子对钍测定的影响。提出的方法曾用于微量钍的测定,结果满意。     

催化光度法测定痕量铜—Cu(Ⅱ)—亮绿SF—H_2O_2体系

本文基于在氨性介质中痕量Cu(Ⅱ)对H_2O_2氧化亮绿SF反应的催化作用,提出了催化光度法测定痕量铜的新方法,其检出限为1.9×10~(-10)g/ml,线性范围为3.16×10~(-10)～1.15×10~(-8)g/ml。同时,测定了催化反应与非催化反应的表观活化能,研究了共存离子对测定的影响。方法用于铝合金和环境水样分析,获得了满意的结果。     

硫氰酸锌络阴离子与结晶紫在水溶液中的显色反应研究

在聚乙烯醇(PVA_(124))存在下,锌(Ⅱ)与硫氰酸盐和结晶紫形成离子缔合物,在550nm处有最大吸收峰。0—4μgZn/25ml范围内服从比尔定律,表观摩尔吸光系数为1.92×10~5L·mol~(-1)·cm~(-1)。方法灵敏度较高,选择性好,操作简便,可直接测定金属样品中的微量锌。     

催化动力学光度法测定痕量锰的研究

本文研究了在 PH6.4的 HAc-NaAc 介质中,痕量 Mn(Ⅱ)对过氧化氢氧化铬黑 T 褪色的新指示反应,其反应的表观活化能为63.68KJ·mol~(-1),表观速率常数 K=5.68×10~(-4)/S,半衰期T_(1/2)为20.32mm,该反应为一级反应。由此建立了催化动力学光度法测定痕量锰的新方法。本方法的 Sandell 灵敏度为4.48×10~(-7)ug/cm~2,测定范围为0～20ng/25ml。对合金钢标样和饮用水中锰的测定,结果令人满意。     

5-(4-磺基-1-萘偶氮)-8-羟基喹啉分光光度法测定微量镍的研究

5-(4-磺基-1-萘偶氨)-8-羟基喹啉(SNAZO)在乳化剂-OP的存在下与镍(Ⅱ)形成稳定的红色配合物,其镍(Ⅱ)与试剂的组成比为1:4。。配合物在520～540nm的范围内有最大吸收,其表观摩尔吸光系数ε=9.05×10~4l·mol~(-1)·cm~(1),Sandell灵敏度S=6.49×10~(-4)μg/cm~2,Ni(Ⅱ)的浓度在0～0.8μg/ml范围内遵守朗伯-比尔定律。经验试,研究了SNAZO与Ni~(2+)的显色反应性能,并建立了测定微量镍的吸光光度新方法。     

食品中微量铁的化学发光测定

本文研究了铁(Ⅲ)一亚铁氰化钾一鲁米诺化学发光新体系,提出了一个测定铁的高灵敏化学发光分析法,该方法对铁(Ⅲ)的检出限为9×10~(-100g/ml,相对标准偏差小于4%,线性范围是4×10~(-8)～2×10~(-5)g/ml·     

钴(Ⅱ)—6—Br—BTAMB—硫酸羟胺体系的极谱催化波研究

用单扫示波极谱仪,使钴(Ⅱ)在醋酸钠-醋酸-6-Br-BTAMB-硫酸羟胺底液中于-0.67V产生一灵敏的催化波,钴(Ⅱ)浓度在1.67×10~(-9)～1.67×10~(-7)mol·L~(-1)范围内与催化波峰高成良好的线性关系,检出限达6×10~(-10)mol·L~(-1).研究了催化波的形成条件及性质.测定了分子筛、生物制品及人发等样品中钴的含量.     

催化动力学光度法监测试样中痕量钒

本文详细地研究了钒催化溴酸钾氧化溴代邻苯三酚红的褪色反应,用于监测各种试样中的痕量钒。在最佳测定条件下,方法的表观摩尔吸光系数高达1.51×10~7L·mol~(-1)·cm~(-1),其灵敏度为3.37×10~(-12)gV(v)/ml,线性范围为3.068～76.70ngV(v)/27ml,选用合适掩蔽剂提高了方法的选择性。该法已用于豆类作物、草霉、人发、麦饭石及水中痕量钒的测定,结果令人满意。     

用邻硝基苯基荧光酮和溴化十六烷基三甲基铵分光光度法测定微量铜

在pH为6.3的六次甲基四胺—盐酸介质中,铜(Ⅱ)-O-NPF-CTMAB络合物的最大吸收波长为595nm,摩尔吸光系数值ε为1.25×10~5L·mol~(-1)·cm~(-1).铜浓度在0～7μg/25ml范围内服从比耳定律.用本法测定了铝合金和天然水中微量铜.     

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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