黄原酯棉吸附金属离子性能及其应用的研究

本文系统研究了黄原酯棉对金属离子的吸咐性能，探讨了黄原酯棉对金属离子的吸附机理。通过吸附、洗脱、干扰离子试验，建立了黄原酯棉吸附富集原子吸收法测定痕量铜、铅、镉的新方法，用于天然水、自来水、饮料及盐类中痕量铜、铅、镉的测定。     

黄原酯棉对铅（Ⅱ）和铜（Ⅱ）吸附特性的研究

医用脱脂棉经氢氧化钠浸泡制成碱纤维，再用二硫化碳黄原酯化后，经水洗、干燥而制成黄原酯棉。研究了自制的黄原酯棉对铅（Ⅱ）和铜（Ⅱ）的动态吸附特性，其吸附回收效果用火焰原子吸收分光光反法进行测定检验。结果表明：在ｐＨ＝１～５的范围内，浓度为２０～５００μｇ／Ｌ的铅（Ⅱ）和铜（Ⅱ）能被定量吸附回收，回收率在９７％～１０３％之间，定量富集倍数在１００倍以上；所制黄原酯棉对铅（Ⅱ）和铜（Ⅱ）的饱和吸附量均在１ｍｇ／ｇ（ＣＣＸ）左右为宜，这既能满足一般要求，也使制品有一定强度；在用盐酸调节试液酸度和作为洗脱液时，回收率低，而用硝酸代替之时，可达到定量回收，所选洗脱液是１ｍＬ５０％（Ｖ／Ｖ）的硝酸溶液。     

超声辅助分离富集-催化极谱法测定中草药中痕量镉

针对中草药中重金属镉含量较低,不易直接测定的问题,本文提出了以巯基棉在超声辅助条件下分离富集,催化极谱法测定中草药中痕量镉的新方法。研究发现,在超声辅助下巯基棉对草药中痕量镉具有良好的吸附作用,被吸附的镉可用醋酸和磷酸分步定量洗脱,基于此建立了超声辅助巯基棉分离富集中草药中痕量镉的方法。在最佳条件下,巯基棉对镉的富集因子为8,方法检出限为0.52 ng/m L,加标回收率为97.1%~102%,将该方法用于麦冬和鱼腥草中痕量镉的测定,结果满意。     

马铃薯淀粉黄原酸酯基高吸水树脂对Pb~(2+)吸附机理的研究

以马铃薯淀粉黄原酸酯为原料制备高吸水树脂,并对其吸附Pb2+的动力学和吸附热力学行为进行了研究.结果表明:马铃薯淀粉黄原酸酯基高吸水树脂在初始浓度100mg/L溶液中对Pb2+的吸附在200min后基本达到吸附平衡,吸附容量高达80.65mg/g.该高吸水树脂对Pb2+的静态吸附过程符合准二级动力学方程和Langmuir等温吸附方程,且吸附是一种自发过程.     

纤维素黄原酸酯对水中Ni~(2+)离子的吸附研究

采用脱脂棉与二硫化碳反应制备纤维素黄原酸酯,并对含镍离子的废水进行吸附研究,考察了吸附温度、吸附时间、溶液pH值以及吸附剂用量等因素对吸附率及吸附量的影响.结果表明,当吸附温度为50℃、吸附时间为2h、溶液pH值为8.0、吸附剂用量为2.0g时,纤维素黄原酸酯对镍离子吸附量可达26.11mg/g,吸附率97.18%.纤维素黄原酸酯对镍离子的吸附效果较好而且纤维素黄原酸酯的制备工艺简单,是一种高效、价廉的水处理剂.     

巯基棉富集—氢化物原子荧光法测定尿液中硒

巯基棉对硒(Ⅲ)有较强的吸附能力,本文通过对吸附条件的试验,提出在5.0mol.L~(-1)盐酸介质中,用巯基棉富集尿液中硒,试液流速为2.0ml/min,以Hcl和HNO_3为100∶4的混合液作为洗脱液,采用氢化物原子荧光法测定富集液中硒含量。实验结果表明,此方法的检出限可达0.01μg.L~(-1)、RSD为4.3～3.1％,尿样加标回收率为92.5～104.0％。     

黄原酯棉富集分离火焰原子吸收法测定煤中痕量铅

研究了黄原酯棉富集分离火焰原子吸收光谱法测定煤中痕量铅的方法。试验结果表明：该方法较简便、快速和准确,相对标准偏差小于８．２％,回收率在９０％～１０８％之间     

β—砜基黄原酸酯制备中的介质效应及其非对映异构体的确证

制备β－砜基黄原酸酯过程中应用ＨＭＰＡ可增强β－砜基醇锂的亲核性，使醇锂定量地转化为黄原酸酯．通过测定中间体β－砜基醇结构确证了β－砜基黄原酸酯非对映异构体的结构．     

褪色光度法测定痕量铬（Ⅲ）

在稀盐酸介质中,痕量铬(Ⅲ)能够催化溴酸钾氧化靛蓝胭脂红的反应,由此建立了催化动力学光度法测定痕量铬(Ⅲ)的方法.通过实验确定了反应的最佳条件.方法线性范围为0.04～0.8mg/L,检出限为4.32×10-9g/mL.将该方法用于废水、污水中痕量铬(Ⅲ)的测定,获得了较满意的结果.     

聚乙烯吡啶化学修饰电极预富集-GFAAS测定废水中痕量Cr(VI)和Cr(Ⅲ)的研究

本文研究了用聚乙烯吡啶化学修饰电极预富集——石墨炉原子吸收法测定废水中痕量Cr(Ⅵ)和Cr(Ⅲ)的方法.废水中的痕量Cr(Ⅵ)被富集到经聚乙烯吡啶修饰的钨丝电极上,然后放入石墨杯中进行原子吸收测定“Cr(Ⅲ)在碱性条件下经H_2O_2氧化为Cr(Ⅵ),同法测定在pH为4的HCl介质中,测定的线性范围为1～25ng/m1,对含Cr(Ⅵ)10ng/ml的溶液十次平行测定,相对标准偏差为5.4%,检出限0.4ng/ml,二十多种共存离子不干扰测定.样品测定回收率在94～104%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.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

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