HG-ICP-AES法测定山豆根中的微量元素

建立微波消解-氢化物发生-电感耦合等离子体发射光谱联用技术测定中药山豆根中砷、锑、铋和锡的方法,对微波消解、氢化物发生、电感耦合等离子体原子发射光谱等工作条件进行优化,对还原剂L-半胱胺酸浓度进行了选择.在最佳工作条件下,砷、锑、铋和锡的检出限分别为0.006、0.009、0.003和0.005μg·g-1,相对标准偏差分别为6%、2%、3%和3%(n=10);加标回收率分别为102%、95%、98%和110%.     

微波消解-HG-ICP-AES法测定郁金中砷硒

建立了微波消解-氢化物发生-电感耦合等离子体原子发射光谱联用技术测定郁金中微量元素砷、硒的方法,对微波消解、氢化物发生、电感耦合等离子体原子发射光谱工作条件进行了优化选择,并对增敏剂进行了选择.在最佳实验条件下,A s和Se的检出限分别为0.13μg.L-1和0.34μg.L-1,相对标准偏差分别为0.83%和1.8%,回收率分别为98%和95%.实验操作简便,结果满意.     

氢化物发生——电感耦合等离子体原子发射测定砷分族元素的氢化物发生

氢化物发生－－电感耦合等离子体原子发射光谱法是现代分析技术的一种重要手段,本文中就该方法测定砷分族元素的氢化物发生原理,影响因素以及氢化物装置进行了阐述。     

干灰化法和微波法测试胶料类的总铅含量比较

用电感耦合等离子体发射光谱测试胶料类样品中的铅,通过干法灰化和微波消解法对胶料类样品进行消解分析对比;试验采用电感耦合等离子体发射光谱对上述两种方法处理的样品进行分析,试验结果表明:微波消解法比干灰化法具有较高的结果准确率,而且具有操作简便,消解速度快的特点。     

氧化锌压敏陶瓷中铋、锑、钴、镍、锰、铬的研究——ICP-AES法

新建一种电感耦合等离子体原子发射光谱(ICP-AES),同时测定氧化锌压敏陶瓷中铋、锑、钴、镍、锰、铬6种元素的方法。通过实验选择浓硫酸直接消解,酒石酸络合铋、锑元素。新方法前处理加标回收率在99.11%～102.23%,铋、锑、钴、镍、铬检出限均小于0.009μg/mL,锰检出限小于0.0005μg/mL,铋、锑、钴、镍、锰、铬6种元素相对偏差(RSD,n=7)均小于2%,为氧化锌压敏陶瓷产品的均匀性判定提供了一个简便快速的方法。     

微波消解-氢化物发生原子荧光法连续测定砷、硒、锑的研究

建立了氢化物发生原子荧光法连续测定食品中砷、硒和锑的方法.采用微波消解的方法处理样品,研究了在酸性介质下,砷、硒、锑与硼氢化钾生成氢化物的反应行为,并对影响荧光强度的诸因素进行了试验和探讨.该法砷、硒、锑的线性范围分别为0~250,0~200,0~200μg/L,检出限分别为0.36,0.42,0.31μg/L,相对标准偏差为1.23%~4.85%.该法灵敏度高,检出限低,应用于实际样品的测定,结果满意.     

微波消解-电感耦合等离子体发射光谱法同时测定煤飞灰中8种元素的方法研究

建立微波消解-电感耦合等离子体发射光谱(ICP-AES)法同时测定煤飞灰中8种微量元素Al、Ca、Fe、Mg、K、Na、Mn和P。研究了微波消解体系和消解条件,煤飞灰样品用硝酸和氢氟酸微波消解分解,加入饱和硼酸溶液分解氟化物沉淀上机测定。用本法测定煤飞灰标准参考物质的结果与标准值相符。方法快速,准确,回收率为86%~105%;RSD均小于5%。     

微波消解-氢化物发生原子荧光光谱法测定煤中砷和硒

采用浓盐酸和氢氟酸作消解剂,以微波消解的方法处理原煤样品,氢化物发生-原子荧光光谱法测定煤中砷、硒,设定了最佳的样品处理条件和仪器测定条件.利用加标回收试验,对分析方法进行了验证.砷、硒的检出限分别为0.05 μg/L和0.06 μg/L,测定煤中砷、硒的回收率分别为97.9%～104.8%、96.6%～106.3%,RSD分别为1.26%～1.59%、1.68%～2.33%.     

微波消解-电感耦合等离子体质谱法测定有机硅树脂中痕量铂元素

将微波消解法与电感耦合等离子体质谱(ICP-MS)相结合,通过对微波消解条件及ICP-MS测定条件进行优化,建立了微波消解-电感耦合等离子体质谱法测定有机硅树脂中痕量铂的方法,并对方法的检出限、加标回收率和精密度进行了分析.实验表明:该方法线性范围宽,线性相关系数大于0.9999,方法检出限为0.024μg/L,加标回收率在86.40%～111.74%之间,相对标准偏差小于2.0%.该方法简便、快速、准确,完全能够满足有机硅树脂中铂含量的检测要求.     

微波辅助预还原-HG-ICP-AES联用技术用于三七无机硒形态分析

建立了微波预还原-氢化物发生-电感耦合等离子体原子发射光谱联用技术测定中药三七提取液中无机硒的方法,对测定条件进行了优化选择,通过直接测定Se(IV)和微波辅助定量还原后测总硒,用差减法测得Se(VI)的量.Se(IV)的检出限为0.23 μg·L-1,相对标准偏差为2.0％,回收率为82％～104％,结果较为满意.     

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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