含有吸附络合物体系的示波分析及机理研究

In（Ⅲ）在pH=4．57的0．2mol．L-1HAc－0．4mol·L-1NaAc－0．1％V．C－0．006％HCuP溶液中，用示波计时电位法可获得良好的示波图，其切口电位Eh=0．90（VsSCE），切口高度与In（Ⅲ）浓度在8．0×10－7～1．4×10－5mol·L－1范围内成正比，检测下限可达5．0×10－7mol·L-1，测得吸附络合物组成为In（Ⅲ）：铜铁试剂=1：1，条件稳定常数为5．9×103．方法应用于含铟合金轴承样品中微量铟的测定，标准偏差为0．59，回收率为98.83％，结果令人满意．     

Al（Ⅲ）—EGTA—PR—CPB显色体系的研究

在pH5.0-5.9的微酸性溶液中.铝(Al).乙二醇二乙醚二氨基四乙酸(EGTA)、邻苯三酚红(PR)和阳离子表面活性剂溴化十六烷基吡啶(CPB)迅速反应,形成一蓝色配位化合物,最大吸收波长于615nm处。该配位化合物的组成为Al(Ⅲ)∶EGTA∶PR∶CPB=1∶1∶3∶12,表观摩尔吸光系数为5.9×10~4dm~3·mol~(-1)·cm~(-1).25cm~3溶液中,0-8μg含量范围内的Al(Ⅲ)遵守比尔定律,17种常见离子和5种阴离子不干扰Al(Ⅲ)的测定。     

碱性介质中铁(Ⅲ)-磺基水杨酸-邻硝基苯基荧光酮-吐温-80显色反应的研究

研究了碱性介质中Fe(Ⅲ)-Sal-o-NPF在非离子表面活性剂吐温-80存在下的显色反应条件.反应适宜的酸度为PH10.0～11.0,络合物的λ_(max)=632nm,ε_(632)=7.73×10~4L·mol~(-1)·cm~(-1),稳定时间为12h,组成为Fe(Ⅲ):Sal:o-NPF=l:l:2,0～10μgFe/25mL符合比尔定律,研究了ca~+、Mn~(2+)等10多种物质的干扰.用本法直接测定天然矿泉水中的微量铁,相对标准偏差3.86％,平均回收率97·4 ％.     

镓的高灵敏显色反应(Ga(Ⅲ)-BPR-Tween80-CTAB体系)

本文研究了高灵敏的Ga(Ⅲ)-BPR-Tween80-CTAB体系。该体系的适宜酸度为pH2.87～3.42。最大吸收在528nm。锌量在0.1～1.0μg/25ml范围遵守比耳定律。当Tween80在高浓度(0.8％)时,ε=5.72×10~5l·mol~(-1)·cm~(-1);当Twnne80在低浓度(0.24％)并辅以少量H_2O_2(浓度为4.8×10~(-3)％)时,ε=1.09×10~6l·mol~(-1)·cm~(-1)。镓在6mol/l盐酸介质中用乙酸丁酯萃取分离后,测定了分子筛型催化剂中的镓含量。     

盐酸川芎嗪注射液中盐酸川芎嗪的毛细管电泳测定

报道了一种快速、准确的盐酸川芎嗪注射液中盐酸川芎嗪的毛细管电泳测定法．该方法的线性范围为10～600mg／L;当其浓度为200mg／L时,（相对标准偏差）值为1．52％（n=6）;加入回收率为96．66％±3.02％（n=5）     

铬(Ⅲ)5-Br-PADAP显色反应的分光光度研究及其应用于废水中微量铬(Ⅲ)的测定

本文报告用5-Br-PADAP作显色剂,研究在水一乙醇介质中测定铬(Ⅲ)的条件,确定了铬(Ⅲ)与5-Br-PADAP生成暗兰紫色络合物的适宜pH为4.0-6.0,其最大吸收峰位于600nm,摩尔吸光系数为7.93×10~41.mol~(-1)·cm~(-1),遵守比耳定律的浓度为0-15 ug铬(Ⅲ)/25 ml.试验45种共存离子中,仅等量的铁(Ⅲ)、铜(Ⅱ)、钴(Ⅱ)、镍(Ⅱ)、镓(Ⅲ)铟(Ⅲ)和铊(Ⅲ)有干扰.本法用于工业废水中铬(Ⅶ)和总铬的测定,结果良好,其变动系数为2.5%回收率均在95%以上.     

5－Br－PADN双峰双波长法测定铁（Ⅲ）

研究５－Ｂｒ－ＰＡＤＮ与铁（Ⅲ）的显色反应，在ｐＨ９．０～９．４范围内，当有１０％ＳＤＳ存在时，铁（Ⅲ）与５－Ｂｒ－ＰＡＤＮ形成１：４的稳定配合物。λ＿（ｍａｘ）为５３４ｎｍ，ε为５．１３×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），铁（Ⅲ）浓度在０～１２．５×１０￣（－４）ｇ／Ｌ范围内符合Ｂｅｅｒ定律，用双峰双波长法测定茶叶中痕量铁（Ⅲ），结果满意。     

钠抗镉对水生物毒性及吸收动力学的研究

测定Cd以及Cd在NaCl存在时对水蚯蚓（T.Tubifex）的毒性,并用~(109)Cd~(2+)标记测定水蚯蚓对Cd~(2+)吸收速度。实验发现随着Na~+变化Cd半致死量LC_(50)也发生变化,当Na~+浓度增加到8.0×10~(-2)mol·L~(-1)时,在48h时,毒性下降了21倍;在低于1.0×10~(-3)mol·L~(-1)NaCl时,水蚯蚓对Cd~(2+)吸收速度没有明显的变化,可当NaCl浓度大于1.0×10~(-2)mol·L(-1)时有明显下降（P<0.05）。用Lineweave-Burk法处理实验数据得到最大吸收速度V_max和米氏常数K_m,当Na~+提高时V_max基本保持为常数(5.5-7.5)×10~(-7)mol·g~(-1)·h~(-1),而K_m成倍增加,这表明Cd~（2+）和Na~+竞争相同的转移通道进入动物体内,从而导致影响Cd对水蚯蚓的毒性。     

藏红T新分光光度法测定水中微量亚硝酸盐氮

藏红T与亚硝酸根在0.1mol/l的盐酸溶液中可形成红色配合物,在600nm处有最大吸收。ε600nm=7.39×10~3l·mol~(-1)·cm~(-1),桑德尔灵敏度为9.34×10~(-3)μg/cm~2。亚硝酸盐氮含量在0～3μg/ml范围内遵守比尔定律。显色液在室温下避光放置可稳定6小时以上。亚硝酸盐氮含量为2μg/ml时,11次平行测定的标准偏差为1.14×10~(-3),相对标准偏差为0.22％,该方法用于湖水、河水、污水等水样中亚硝酸盐氮的分析,获得满意的结果。     

维多利亚兰B光度法测定水中阴离子表面活性剂

在明胶和硫酸介质中,维多利亚兰B与十二烷基苯磺酸钠生成稳定的兰色配合物。ε595_(nm)=2.30×10~4L·mol~(-1)·cm~(-1)。基于这一反应,可以测定城市污水中阴离子表面活性剂含量。用本法进行11次实际样品的平行测定,其相对标准偏差为2.1％,标准加入法测得回收率为94.5％～99.1％。     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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