微波消解-原子荧光法同时测定土壤和水系沉积物中砷和汞

建立了微波消解-原子荧光法同时测定土壤和沉积物中砷和汞的含量的方法,并对王水的用量进行了优化,得到6ml王水用量最佳。结果表明该方法检出限为As 0.012 mg·kg^-1;Hg 0.001 mg·kg^-1;相对标准偏差为As 0.9%～4.2%;Hg 1.2%～6.2%(n=6),加标回收率砷为87.0%～111.0%;汞为88.0%～116.0%。该方法操作高效、简便,灵敏度高,结果准确,可用于土壤和沉积物中砷和汞的同时测定。     

一种西夫碱化合物的合成及其在汞测定中的应用

合成一种新西夫碱2-氨基-5-巯基-1,3,4-噻二唑水杨亚胺(MTYMP),用常规法对其结构进行表征.该化合物在300 nm激发下,在410 nm处有强荧光峰,与汞离子可形成稳定的配合物而使其荧光猝灭.据此,该化合物可作为测定汞的荧光试剂,建立一个荧光猝灭测定微量汞的新方法,汞离子的含量在4.0~100.0μg·L-1范围内与试剂的荧光熄灭值呈线性关系,方法的检出限为0.315μg·L-1.该方法应用于废水中微量汞的测定,结果满意.     

4-氨磺酰基苯基重氮氨基-4-苯基-2-噻唑的合成及与汞的显色反应

本文合成了4—氨磺酰基苯基重氮氨基—4—苯基—2—噻唑（SPDAPT）．在pH10.4的硼砂缓冲介质中,十二烷基苯磺酸钠存在下,SPDPT与Hg2形成2:1的紫红色配合物．配合物的λmax为520nm,表现摩尔吸光系数＝6.75×104L·mol-1．汞量在0～480μg·L-1符合比尔定律．最低检测限为24μg·L－1。用于废水中微量Hg2的测定,结果满意．     

改性绿茶对汞的吸附作用

采用原子吸收光谱法研究有机汞和无机汞的吸附作用。改性绿茶的用量为 2 5 mg、在 p H值 =7的溶液中搅拌 6 min,无机汞的吸附率达 95 % ,有机汞的吸附率不大于 5 % ;同等量的改性绿茶在 p H值 =1的溶液中搅拌9min,有机汞的吸附率可达到 90 %以上。 10次重复分离测定 0 .1μg· ml- 1汞溶液 ,测得无机汞、有机汞的检出限分别为 0 .0 6μg· L- 1 和 0 .0 8μg· L- 1 ,相对标准偏差为 8.6 %和 5 .8% ,回收率为 92 .5 %～ 10 5 .3%和 93.8%～ 10 6 .6 %。实验还表明 ,在盐酸浓度分别为 2 .0 mol· L- 1、6 min和 4 .0 mol· L- 1、11min,共存 KCl的量为 10 0mg,可定量解吸无机汞和有机汞     

铂(Ⅳ)-溴酸钾-甲基偶氮胂对磺胺基褪色光度法测定微量铂

报道了以铂(Ⅳ)催化溴酸钾氧化甲基偶氮胂对磺胺基的褪色反应,建立了一种在水相中直接测定微量铑的催化光度分析法.铂含量在5.0～40.0μg·L-1范围内符合比耳定律,检出限为5.0μg·L-1.用于铂 铑催化剂和铂 钯精矿中铂的测定,结果满意.     

微波消解-氢化物发生原子荧光光谱法及其分析应用

本文建立了一种梯度升压微波消解样品,氢化物发生双道原子荧光同时测定蔬菜样品中汞、砷的方法.在优化实验条件下,汞和砷分别在(0.01～2.00)μg/l和(0.1～200.0)μg/l的浓度范围内与荧光强度△If值符合比尔定律,其工作曲线回归方程分别为△If633.0×CHg(μg/l)-16.57(r=0.9995)、△If=69.72×CAs(Ag/l) 58.13(r=0.9998).汞、砷的检出限分别为0.0026 μg/l和0.0331 μg/l.该方法准确、快速、灵敏,成功用于蔬菜中Hg、As的同时测定.对AG-AFS法同时测定汞、砷的机理亦进行了探讨.     

罗丹明B-Os(Ⅳ)-KIO4催化动力学光度法测定微量锇

研究发现在酸性条件下,微量Os(Ⅳ)对高碘酸钾氧化罗丹明B褪色反应具有显著的催化作用,并以此为指示反应建立了测定微量锇的催化光度法.此反应的最佳条件为:10.0mL溶液中含0.10mol·L-1H2SO40.50mL,0.010mol·L-1KIO41.50mL,0.010%罗丹明B0.80mL,(90±0.5)℃水浴加热20min.方法的检测限为2.0×10-7g·L-1,Os(Ⅳ)含量在0.20～7.00μg·L-1范围内服从比耳定律.此方法已用于贵金属样品中微量锇的测定,结果满意     

钨酸盐-碱性染料-聚乙烯醇高灵敏光度法测定痕量锡的综合研究

报告一类光度法测定纳克量锡的新方法.在聚乙烯醇(PVA)存在下,锡(Ⅳ)与钨酸盐可分别和碱性染料罗丹明B(RB),丁基罗丹明B(BRB),耐尔蓝(NB)反应,形成离子缔合物,缔合物的最大吸收分别位于580nm(RB),565nm(BRB)和580nm(NB),表观摩尔吸光系数ε值分别为3.23×107L·mol-1·cm-1(RB),2.54×107L·mol-1·cm-1(BRB)和2.95×107L·mol-1·cm-1(NB).服从比耳定律的范围分别在0.4～2.0μg·L-1(RB),0～2.4μg·L-1(BRB)和0～2.0μg·L-1(NB),检出限(3σ)分别为0.031μg·L-1(RB,n=12),0.073μg·L-1(BRB,n=11)和0.083μg·L-1(NB,n=11).离子缔合物至少稳定72～240h.考查了40多种共存离子的影响,确立了测定痕量锡的酸度条件等.研究了缔合物的红外光谱,锡钨杂多络阴离子具有Keggin结构.方法均已用于某些合金钢和锌合金中痕量锡的测定,结果满意     

锰(Ⅱ)-二甲酚橙-高碘酸钾体系催化分光光度法测定痕量锰

在Na2B4O7-NaOH缓冲介质及加热条件下,锰(Ⅱ)对高碘酸钾氧化二甲酚橙褪色有明显的催化作用,据此建立了测定水样中痕量锰(Ⅱ)的新方法.该法的线性范围为0～32μg·L-1,检出限为4.8×10-6g·L-1.催化反应表观活化能为93.4kJ·mol-1,表观速率常量为1.76×10-3s-1.     

新试剂2-对亚氨基偶氮苯噻唑与汞的显色反应及其应用研究

研究新试剂2-对亚氨基偶氮苯噻唑与汞显色反应条件,结果表明,在pH7.0～8.6的B-R缓冲溶液中,在非离子型表面活性剂TritonX-100存在下,该试剂与汞生成橙色的络合物,络合物对试剂空白的最大负吸收峰位于512nm,汞与试剂的络合比为11,摩尔吸光系数为2.2×104L·(mol·cm)-1,符合比尔定律的线性范围是0.2～3.6μg·mL-1.建立的方法成功地用于人发中汞含量的测定.标准加入回收率为97～105%,相对标准偏差为2.4%.     

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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