卤素动力学分析法研究 Ⅳ 过氧化氢氧化甲基橙催化光度法测定溴离子

基于稀硫酸介质中溴离子催化过氧化氢氧化甲基橙，建立了测定痕量溴离子的新催化光度法．方法灵敏度为2×10－3 mg／L（△A=0．001，b=1cm）．检出限为3×10mg／L．测定溴离子的线性范围为 0．10 ～1．30mg／L.用于测定金属镁与硫酸铵中的溴．     

离子色谱法测定地下水中的NO3^-

建立了用单柱阴离子色谱测定地下水中NO3^-的方法。采用NJ—SA-4A阴离子交换柱、0．35mmol／L NaCO3＋0．05mmol／LNaHCO3混合溶液为流动相、电导检测器在5min内完成NO5的测定。NO5浓度在0．1-50mg／L范围内与峰面积线性关系良好,线性回归方程为△S=1．14×10^-4C＋0．192,相关系数为0．9999,方法检出限为0．05mg／L,加标回收率为99．6％-101．5％,方法简便实用,用于环境样品分析,所得结果令人满意。     

新型水杨醛缩硫代氨基脲合铜(Ⅱ)为中性载体的碘离子选择性电极的研究

以水杨醛缩硫代氨基脲合铜(Ⅱ)为中性载体,制备了一种对碘离子(I-)具有优良的电位响应特性并呈现出反Hofmeister选择性行为的离子电极,其选择性大小依次为:I-,Sal-,ClO-3,H2PO-4,2,SO2-4,SCN-,Cl-,NO-3,NO-SO2-4.该电极在pH2 0的磷酸盐缓冲体系中具有最佳的电位响应,在1 0×10-1～8 0×10-5mol/LI-浓度范围呈近能斯特响应,斜率为-54 0mV/pI-(25℃),检测下限为4 0×10-5mol/L.采用交流阻抗和紫外光谱分析技术研究了配合物中心金属原子以及配合物本身的结构对电极电位响应行为的作用机理.将该电极用于药物含碘量的测定,获得满意的结果.     

离子选择性电极法测定药片中的奈福泮

报道一种以奈福泮与苦酮酸形成的缔合物为电活性物的新型PVC膜奈福泮离子选择电极 ,电极的Nernst响应范围为 5 .0× 10 - 2 ～ 5 .0× 10 - 4 mol L ;斜率为 5 6mV pC ;检测限为 7.9× 10 - 5mol L .已将该电极应用于盐酸奈福泮药片中测定奈福泮的含量 ,结果与紫外分光光度法相符 .     

以新型杯[4]芳烃衍生物为载体的铅离子选择性膜电极

研究了以杯[4]芳烃衍生物（25,27-二[-3-（5-甲基噻二唑基）硫代丙氧基]-26,28-二羟基-5,11,17,23-四叔丁基杯[4]芳烃）为载体的PVC铅离子选择电极的响应行为,结果表明：此电极对Pb^2＋具有优良的能斯特响应性能,在10^-5～10^-1mol／L的浓度范围内,响应斜率为30．4mV／decade,检测下限为3．1×10^-6mol／L,碱金属、碱土金属及大多数过渡金属离子对铅离子的测定无干扰,电极有较好的稳定性和重现性．该电极可在体积分数不大于20％的甲醇水溶液中使用,可作为准确滴定铅离子的电位滴定指示电极,并能用于实际样品中铅含量的直接测定．     

离子色谱法同时测定饮用水中的氯化物、硝酸盐氮和硫酸盐

采用离子色谱法 ,Shim -PackIC—A1阴离子柱 ,以 2 .5mmol/L邻苯二甲酸 + 2 .4mmol/L三 (羟甲基 )氨基甲烷为流动相 ,同时测定饮用水中氯化物、硝酸盐氮和硫酸盐的含量 ,回收率为 99%～ 10 2 % ,相对标准偏差均 <3 % ,最低检测限分别为 0 .0 10mg/L、0 .0 0 5mg/L、0 .0 2 0mg/L。实验证明 ,此方法快速、简便、准确、灵敏度高     

基于表面印迹聚合物的铯离子电化学传感器的制备及应用

为实现复杂溶液体系中微量或痕量铯离子的检测,采用表面印迹技术,以铯(I)离子为模板,SBA-15为基底,壳聚糖为功能单体,戊二醛为交联剂制备了铯(I)离子印迹聚合物Cs(I)-IIP。并以Cs(I)-IIP为改性剂,PVC为中性载体,2-硝基苯基辛醚为增塑剂,添加四苯基硼酸钠亲脂性盐,成功制备了铯离子选择性电位传感器。结果表明:该传感器的电位响应时间小于3 s,检测限为6. 0×10~(-7)mol/L,线性范围为1. 0×10~(-6)～1. 0×10~(-1)mol/L,斜率为56. 9 m V/Decade,并对铯离子有较好的选择性。该传感器对城市用水中铯离子的检测结果与ICP-MS相当,证明成功制备了铯离子电化学传感器。     

稀土离子对体外培养的成骨细胞增殖、分化和功能表达的影响

采用噻唑蓝(MTT)法、碱性磷酸酯酶比活性的定量测定、细胞周期测定、矿化结节计数、扫描和透射电子显微镜观察等方法研究了不同浓度稀土离子(Ln3 ,包括La3 ,Sm3 ,Dy3 ,Nd3 ,Er3 和Gd3 )对成骨细胞UMR 106增殖、分化和功能表达的影响.结果表明,浓度在1.00×10-4 mol/L时,各稀土离子均表现出抑制成骨细胞增殖的作用. 当浓度降低到1.00×10-9～1.00×10-5 mol/L范围时,则表现出促进作用. 稀土离子(Ln3 )浓度为1.00×10-7及1.00×10-5 mol/L时,显著增强碱性磷酸酯酶比活性(P<0.01). 对其中一个稀土离子La3 作了进一步机理研究,发现极低浓度下(1.00×10-8及1.00×10-9 mol/L)的La3 促进成骨细胞从G0/G1期向S期过渡,并且增强成骨细胞的矿化能力(P<0.001). 扫描电子显微镜和透射电子显微镜结果表明,高浓度(1.00×10-4 mol/L)La3 可使成骨细胞损伤,可见表面变为光滑,微绒毛消失, 细胞膜不完整, 内质网扩张,核膜外凸,核周隙扩张. 低浓度(1.00×10-9 mol/L) La3 对成骨细胞无明显影响. 所得结果提示稀土离子(Ln3 )能够促进体外培养的成骨细胞的增殖、分化和功能表达,呈现出浓度依赖的两面性,并与稀土物种有关.     

胺基修饰荧光碳点的合成及其在Hg（Ⅱ）离子分析中的应用

通过巧妙地改进合成步骤,快速简便地合成出了性能优异的碳点。优化了不同实验条件包括柠檬酸与聚乙烯亚胺的比例,溶液pH值,碳点浓度,反应时间等对碳点性能的影响。新方法所合成碳点在紫外灯下亮度明显增强,量子荧光产率得到大幅度提高。电镜表征结果表明胺基功能化碳点分散性好,粒径均匀。基于Hg（Ⅱ）离子对碳点荧光明显的猝灭效应建立了汞离子分析新方法,汞离子浓度在1．0×10－5～1．0×10－3 mol／L范围内与碳点荧光猝灭强度成良好的线性关系,检测限为（3σ）为8．8×10－6 mol／L．     

单扫描示波极谱法测定废水中铬和甲基橙

在1 mol/L的NH3.H2O-NH4Cl缓冲溶液(pH10.0)中,铬(VI)离子和甲基橙分别于-0.34 V和-0.59 V(vs S.C.E)时出现两个灵敏的极谱峰,且峰电流Ip与Cr(VI)和甲基橙在0~8.0×10-5g/L范围内呈良好的线性关系,其相关系数分别为0.999 1和0.992 8;对铬(VI)和甲基橙的检测限分别为9.46×10-8g/L和1.86×10-6g/L,相对标准偏差为2.18%和4.98%;用于测定实际废水中的铬(VI)和甲基橙,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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