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。     

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.     

8-羟基喹哪啶固相萃取光度法测定烟草中的铁

研究了8-羟基喹哪啶与铁的显色反应,在pH为8.0的氯化氨-氨水缓冲介质中,乳化剂-OP存在下,8-羟基喹哪啶与铁反应生成31稳定的蓝紫色络合物,该络合物可被Wate Plus-C18固相萃取小柱萃取富集,小柱上富集的络合物用乙醇为洗脱剂洗脱后用光度法测定,在乙醇介质中,络合物最大吸收波长λmax=595nm,ε=7.85×103L@mol-1@cm-1.铁含量在0.1～5.0μg/mL内符合比尔定律,方法用于烟草样品中痕量铁的测定,结果令人满意.     

SBDR显色剂固相萃取光度法测烟草中的铅

 研究了对磺酸基苯基亚甲基若丹宁(SBDR)与铅的显色反应,在pH为4.0的HAc-NaAc缓冲介质中,吐温-60存在下,该络合物可被WatersSep-Pak-C18固相萃取小柱萃取,小柱上富集的络合物用无水乙醇洗脱后在乙醇介质中,体系λ_max=560nm,ε=1.12×10⁵L·mol^-1·cm^-1.可用分光光度法测定,铅含量在0~6μg/50mL内符合比尔定律,方法用于烟草中铅含量的测定,结果令人满意.     

微乳液—洋茉莉基荧光酮体系吸光光度法测定铬

该文研究了以微乳液为介质时 ,铬与洋茉莉基荧光酮的显色反应 ,选择 52 5nm为参比波长 ,595nm为测量波长 ,ε为 9.5× 10 4 L·mol- 1·cm- 1,铬量在 0～ 7/2 5μg/mL范围内符合比耳定律 ,方法用于合金钢中铬的测定 ,结果满意 .     

2—[(3,5—二溴—2—吡啶)偶氮]—5—氨基酚——分光光度法定测微量钴

本文研究了2-[(3.5-二溴-2-吡啶)偶氮]-5-氨基酚(简称3.5—Br_2—PAAP)与钴显色反应的适宜条件,其它离子的影响,确定了络合物的组成。实验表明,在 PH=4～5范围内钴与3.5—Br_2—PAAP 形成1:2的紫红色络合物.试剂的最大吸收峰为430nm,络合物的最大吸收峰为540nm,摩尔消光系数ε_(540)=6·48×10~4m01~(-1)cm~(-1),遵守比尔定律的范围为0～25μg/25ml。桑德尔灵敏度为0·00051微克 cm~(-2),表现稳定常数为3.6×10~6。通过对矿样、维生素 B_(12)针剂、小麦进行测定,取得了满意的结果。     

盐酸吗啡片含量的荷移光谱法测定

研究了吗啡与7,7,8,8 四氰基对二次甲基苯醌(TCNQ)的荷移反应,对反应条件进行了优化.在丙酮介质中,二者在30℃中30min即可形成荷移络合物,分别在743和840nm处有较强光吸收,吗啡浓度在0.5～9和0.6～9μg·mL-1范围内符合比尔定律,其表观摩尔吸光系数分别在1.1×104及1.4×104,方法的相对标准偏差为1.8%(n=9).     

二甲氧基羟基苯基荧光酮测定锡的研究和应用

研究了新显色剂二甲氧基羟基苯基荧光酮分光光度测定锡的方法。酸性介质中 ,在表面活性剂TritonX - 10 0存在下 ,试剂与锡形成稳定的络合物 ,在 5 10nm处具有最大吸收 ,其表观摩尔吸光系数ε510 =1.17× 10 5L·mol-1·cm-1,锡含量在 0 - 8μg/ 10mL范围内符合比尔定律。该方法应用于铝合金、碳素钢等样品中微量锡的测定 ,结果满意。     

二甲酚橙—溴化十六烷基三甲胺与铜（Ⅱ）钴（Ⅱ）的光度法研究及铜的测定

本文研究了二甲酚橙(XO)-溴化十六烷基三甲胺(CTMAB)与铜(Ⅱ)、钴(Ⅱ)的显色反应.结果表明在pH8.0,溴化十六烷基三甲胺存在时,铜(Ⅱ)、钴(Ⅱ)与二甲酚橙能形成稳定的络合物.其最大吸收波长均为590nm,摩尔吸光系数分别为6.9×104L·mol-1·cm-1和3.6×104L·mol-1·cm-1.铜(Ⅱ)含量在0～15.1μg/25mL内,钴(Ⅱ)含量在0～18μg/25mL内符合比尔定律.线性方程及回归系数分别为A=4.765×10-3+0.0185C,γ=0.9962;A=3.005×10-3+7.481C,γ=0.9966.应用本法测定了铅合金标样中的微量铜.     

胶束增敏分光光度法测定牛奶中微量铅

研究了在阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)存在的条件下,铅(Ⅱ)与二甲酚橙的显色反应。在pH=5.4的六次甲基四胺缓冲溶液中,Pb与二甲酚橙(XO)和CTMAB反应生成红色的络合物,其最大吸收波长为590nm,表观摩尔吸光系数为1.11×10~5L·mol~(-1)·cm~(-1)。研究表明,加入阳离子表面活性剂CTMAB,显色反应的灵敏度显著提高。铅含量在0～2.0μg/mL范围内符合比耳定律。方法用于牛奶中微量铅离子的测定,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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has