还原—紫还分光光度法测定水中NO3^—

基于NO3^-在酸性介质中被锌粉还原后,溶液紫外吸收光谱将发生显著变化的原理,建立了测定水中NO3^-浓度的还原－紫外分光光度法,该方法采用的波长为202．0nm,水样的pH值控制为7,以试样还原前后在该条件下的吸光度变化值ΔA对NO3^-溶液的浓度进行标定,还原－紫外分光光度法测定NO3^-浓度的线性范围为0－8．5mg/L,最低检出限为0．02mg/L,且F^-,Cl^-以及HCO3^-等常见离子对温室不产生干扰,地下水,自来水,雪水以及湖水等实际水样的测定结果及加标回收实验结果表明,该方法的相对标准偏差小于2．5％,加标回收率在96．3％－103．1％,相对于标准方法（紫外分光光度法）的偏差为4．0％－4．0％,该方法的精密度,准确度和灵敏度均较高,且操作简便,适用于饮用水以及污染较轻的湖水和地下水中NO3^-含量的测定。     

紫外分光光度法检测土壤-水溶液中百菌清分析方法的建立

探讨了紫外分光光度法测定土壤-水溶液中百菌清的方法,分别考察了离子强度和溶液的p H值对百菌清测定的影响,该方法测定百菌清在0.05~0.8 mg/L范围内线性良好,其工作曲线为y=0.229 2 x+0.003 1,相关系数R=0.999 1.平均加标回收率为86.34%~103.85%,RSD值在0.6%~1.06%之间(n=3),方法的检测限为0.013 4 mg/L.所建立的紫外分光光度法与气相色谱法测定结果无显著性差异.结果表明,紫外分光光度法操作简便快捷,干扰少,测定结果准确可靠,可用于土壤-水溶液中低浓度百菌清的测定.     

紫外分光光度法测定环境水中的硝酸盐氮

本基于硝酸盐氮在201．2nm处有强烈吸收，且干扰少，在PH=8碱条件下，建立了用紫外分光光度法直接测定水样中的硝酸盐氮的方法。硝酸盐氮在0～7．0mg／L范围内遵守比尔定律．加标回收率为99．1％～100．1％，检出限0．1000mg／L。可用于自来水，湖水中硝酸盐氮的测定，结果满意．     

紫外分光光度法测定环境水中的硝酸盐氮

本文基于硝酸盐氮在201.2nm处有强烈吸收,且干扰少,在PH=8碱条件下,建立了用紫外分光光度法直接测定水样中的硝酸盐氮的方法。硝酸盐氮在0～7.0mg/L范围内遵守比尔定律。加标回收率为99.1％～100.1％,检出限0.1000mg/L。可用于自来水,湖水中硝酸盐氮的测定,结果满意。     

流动注射在线吸附紫外分光光度法测定水体中的苯酚

基于磷酸三丁酯萃淋树脂对苯酚的吸附 ,建立水体中苯酚的流动注射在线吸附紫外分光光度分析方法 .其线性范围为 0 .0 4～ 1 .2 mg/L,所选浓度的相对标准偏差分别为 6 .7%和3 .5% ,水样加标回收率为 96 .3 %和 1 0 2 .7% ,进样速率为 50次 /h.实际样品的测定结果表明 ,本方法与 4-AAP标准分析方法之间无显著性差异 .     

用紫外双波长光度法同时测定水中酚类和苯胺类物质

紫外双波长光度法可以消除苯酚和苯胺的相互干扰 ,实现水中酚类和苯胺类物质的同时测定 ,所采用的双波长对为 2 0 9.0～ 2 39.8nm和 2 30 .0～ 2 5 3.5nm ,水样的 pH值应控制在 6 .6± 0 .2。水中K ,Na ,Ca2 ,Mg2 ,Cl-和OH-的浓度低于 2 0 0mg/L时不干扰酚类与苯胺类物质的测定 ,油类物质的干扰可通过萃取法消除。紫外双波长光度法测定酚类物质的线性范围为 0～ 2 0mg/L ,检出极限为 0 .0 5mg/L ;测定苯胺类物质的线性范围为 0～ 12mg/L ,检出极限为 0 .0 0 7mg/L。实际水样的加标回收实验和合成水样分析结果表明 ,本方法的相对误差绝对值小于 4.93% ,且操作简便、测试准确 ,可满足微量酚类和苯胺类物质的测定要求     

催化光度法同时测定肉制品中亚硝酸根和硝酸根

依据NO-2能催化溶解氧氧化Fe2 为Fe3 ,利用生成硫氰酸铁而间接测定NO-2;再用锌粉还原NO-3为NO-2,由测得的NO-2总昨而计算出NO-3含量,建立了同时测定肉制品中亚硝酸根和硝酸根的催化光度法.线性范围为1.5～5.0μgNO-2/25mL.NO-3的还原率为99.2%,测定结果的相对标准偏差小于2.1%,平均加标回收率为99.1%～101.9%.摩尔吸收系数7.66×104L·mol-1·cm-1.     

钼-锑-抗分光光度法测定水样中黄磷

探索了用钼-锑-抗分光光度法测定水样中黄磷的分析方法。实验结果表明校准曲线的截距、斜率和相关系数均符合分光光度法的要求;检出限测定结果为0.002 5mg/L;同一浓度6次测定结果的相对标准偏差为1.90%～3.38%;三个不同浓度基体水样进行加标回收实验,其回收率分别为92%～108%;应用于实际水样,测定结果良好。     

水样中NO-2-N的间隔流动分析法

利用SKALAR San 连续流动分析仪,研究间隔流动分析法(SFA)测定亚硝酸盐氮(NO-2-N)的线性范围、精密度、准确度、方法最低检测限、加标回收率.结果表明,间隔流动分析法测定水样中NO-2-N质量浓度具有很高的精确度和准确度,其工作曲线的线性范围为0.01～10.00 mg·L-1,亚硝酸盐氮最低检出质量浓度为2.2μg·L-1,方法的相对标准偏差小于5%,平均回收率为93.3%～102.4%.将间隔流动分析方法和国家标准方法N-(1-萘基)-乙二胺光度法进行比对实验,结果显示,两种方法的测定结果在统计学上无显著性差异.可见,采用SFA法测定水样中NO-2-N,方法的性能参数符合国家标准的要求.     

分光光度法测定水样中三氯乙酸的影响因素

主要对分光光度法测定水样中三氯乙酸实验进行了研究,并着重分析了溶液中的二氯乙酸,一氯乙酸对三氯乙酸的测定实验结果的影响。结果表明,当水样中只有三氯乙酸时,在530 nm处进行吸光度法检测,其线性检测范围为0~10 mg/L,相关线斜率为0.1106,相关系数R2=0.9999,最大加标回收率为99.98%,最小相对标准偏差为1.78%。当三氯乙酸水样中有等浓度的二氯乙酸时,相关线斜率为0.1087,且对等浓度二氯乙酸进行530 nm处分光光度法检测时,二氯乙酸的最大影响百分比达8.73%;当三氯乙酸水样中有等浓度的一氯乙酸时,相关线斜率为0.1118,且对等浓度一氯乙酸进行530 nm处分光光度法检测时,一氯乙酸的最大影响百分比最大达3.49%。     

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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