浊点萃取-火焰原子吸收光谱法测定水样中痕量铅的研究

提出了浊点萃取-火焰原子吸收光谱法测定痕量铅的新方法,并详细探讨了溶液pH值、试剂浓度等实验条件对浊点萃取及测定灵敏度的影响.在最佳条件下,富集50 mL样品溶液,用火焰原子吸收光谱法测定,铅的检测限为0.82μg/L,铅的富集倍数为66倍.该方法可用于自来水、井水及河水中痕量铅的测定.     

聚丙酰胺富集─液珠萃取目视比色法测定矿石中微量金

本文拟定了一种快速测定矿石中微量金的方法。该法用聚丙酰胺分离富集金，丙酮；０．３％盐酸（１０：１，Ｖ／Ｖ）洗脱，用ＴＭＫ－ＴＢＰ液珠萃取目视比色法测定。试样分析结果表明，本法简单，快速，且灵敏度较高。     

聚丙酰胺富集─液珠萃取目视比色法测定矿石中微量金

本文拟定了一种快速测定矿石中微量金的方法。该法用聚丙酰胺分离富集金，丙酮；０．３％盐酸（１０：１，Ｖ／Ｖ）洗脱，用ＴＭＫ－ＴＢＰ液珠萃取目视比色法测定。试样分析结果表明，本法简单，快速，且灵敏度较高。     

由钛铁矿制备高纯度盐酸钛液

报道了由钛铁矿制备高纯度盐酸钛液的工艺过程，研究了萃取纯化过程中ＴＢＰ浓度，水要酸度，萑取平衡时间及钛液浓度等因素对实验结果的影响，考究了盐酸浸取钛铁矿的条件。结果表明，ＴＢＰ萃取纯化盐酸钛液十分有效，控制适当条件可得到高纯度钛液。     

硅胶-P350萃取色谱法连续分离微量铟(Ⅲ)、铊(Ⅲ)和金(Ⅲ)的研究

本文研究了以１．０ｍｏｌ／ＬＨＢｒ溶液为流动相，以硅烷化硅胶负载的甲基膦酸二甲庚脂（Ｐ３５０）作固定相，萃取色谱法使微量铟、铊和金与大量共存杂质元素分离，富集在色谱柱上的铟、铊和金分别用水、１．５ｍｏｌ／ＬＮａＡｃ和１％Ｎａ２ＳＯ３溶液洗脱进行连续分离与测定。经实际样品的试用考核，结果令人满意。     

溶剂萃取逆胶束化学发光测定氯丙嗪

详细研究了混合溶剂的不同配比、萃取剂的选择、氯金酸浓度、盐酸浓度、R([H2O]/[CTMAB])值、鲁米诺浓度、碳酸钠浓度等因素对发光强度的影响.结果表明,当二氯甲烷与环己烷体积比为3:7时发光信号最大,平行性最好;选二氯甲烷为萃取剂;当氯金酸、盐酸、鲁米诺、碳酸钠浓度分别为2.04×10-4,0.05,0.40×10-4,0.3mol/L时,有最稳定的基线,响应最大并且平行性好,故选择这些浓度为最佳实验条件;当R值为17.8(CTMAB浓度为0.125mol/L,水浓度为2.22mol/L)时逆胶束最稳定;用环己烷作为载流能得到稳定基线.在选定的实验条件下,测定了化学发光强度与盐酸氯丙嗪之间的关系.     

萃取富集原子吸收法测定烘焙食品中痕量铅

烘焙食品试样经灰化处理后，用APDC-DDTC-IBK体系萃取富集试液中的铅，利用空气-乙炔火焰原子吸收法测定烘焙食品样品中铅的含量．考察了仪器的工作参数、试液的酸度、反应时间和萃取时间等测定条件，并对可能存在的元素进行了干扰实验．在最佳条件下本法测定铅的相对标准偏差为1．5％-2．6％，回收率为98．2％-102．1％．     

壳聚糖富集分光光度法测定水中痕量镍

研究了壳聚糖分离富集Ｎｉ２＋的最佳条件，建立了壳聚糖分离富集、丁二酮肟分光光度法测定Ｎｉ２＋的新方法。此方法选择性好，灵敏度高，用于天然水中痕量Ｎｉ２＋的测定，其结果与原子吸收分光光度法测得结果一致     

在线富集装置应用于火焰原子吸收法测定水中痕量重金属最佳实验条件探讨

通过大量实验探讨了在线富集装置应用于火焰原子吸收法，测定水中痕量重金属时的最佳实验条件，为在线富集装置在环境监测中的应用，奠定了基础。     

离子液体预富集-火焰原子吸收法测定头发中痕量锂

制备了5种离子液体1-烷基-3-甲基咪唑六氟磷酸盐[CnMIm][PF6](其中n=4,6,8,10,12),用于头发中超痕量锂的预富集.锂(I)在萃取剂磷酸三丁酯(TBP)、协萃剂FeCl3作用下形成LiFeCI4·2TBP配合物而被萃取进入离子液体介质.有机相中加入盐酸分解锂配合物而使锂(I)进入水相,其水溶液直接用于火焰原子吸收法测定锂.最佳萃取条件:V(TBP):V(IL)=9:1;水相酸度(HCl):0.03 mol/L;相比(V(O):V(A))=7:1;n(Fe):n(Li)=2:1.在此条件下,锂的一次萃取率和反萃率达到78%和90%,富集倍数在100倍以上.机理研究表明,Li+与TBP和FeCl3形成极性较小的LiFeCI4·2TBP络合物而被萃取进入有机相,在有机相中加入盐酸因H+极化强于Li+而将Li+置换重新进入水相.预富集结合火焰原子吸收法应用于头发中超痕量锂的测定,检出限为2.5 ng/L,精密度0.05%,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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