高效液相色谱法同时测定化妆精油中的七种性激素

建立了用高效液相色谱法同时测定化妆品中七种性激素的有效方法。试样经脱脂、提取、清洗、浓缩后，采用ODS-C18色谱柱，乙腈与水为流动相，进行梯度洗脱，应用二极管阵列检测器、荧光检测器的串联技术对样品中的七种性激素进行测定和鉴定，获得了良好的效果。七种性激素最低检出浓度为5μg／g，变异系数在3．4％以下，样品加标回收率在83％以上，标准曲线在5～150μg/mL的线性范围内，相关系数均大于0．999。     

ICP-MS法同时测定桉叶油中5种有害重金属元素

建立了ICP-MS法同时测定桉叶油中有害重金属元素铅、镉、砷、铬、汞的实验方法.样品经微波消解后,直接用ICP-MS同时测定上述5种元素,结果显示5种元素的检出限分别为Pb:3.0μg/kg、Cd:0.4μg/kg、As:3.4μg/kg、Cr:2.6μg/kg,Hg:52.4μg/kg;所有元素相关系数r≥0.999 7;相对标准偏差RSD<5%;回收率在80.6%～116.1%之间.该法简便、测定速度快、结果准确,适用于桉叶油等精油中有害金属元素的测定.     

匀浆法提取、离子色谱法测定烟草中的糖

研究了用匀浆法提取、离子色谱法测定烟草中的糖.烟草样品用水匀浆法提取;提取液中的糖以CarboPac PA1(4×250 mm,5μm)阴离子交换柱为固定相,0.2 mol/L氢氧化钠溶液为流动相分离,脉冲安培检测器检测;1次进样可同时测定烟草样品中葡萄糖、果糖、蔗糖.方法加标回收率在96%～103%之间,相对标准偏差均小于2.6%.检测限均小于50μg/L,结果满意.     

双道原子荧光法同时测定岩石中砷和锑

介绍了一种使用双道原子荧光法同时测定大量岩石样品中砷和锑的方法,对测定条件进行了优化.As和Sb分别在0～100 μg/L和0～10μg/L范围有好的线性关系,检出限分别为0.28μg/L和0.11μg/L,RSD分别为0.78%和0.55%,回收率分别在95.2%～108%和96.7%～102.5%之间.该方法用于4种岩石样品中As和Sb的同时测定,测定值与标准值基本相符.     

用火焰原子吸收光谱法测中草药中的金属元素

在微波消解罐内用硝酸消化样品,采用火焰原子吸收光谱法对9种中草药中的K、Na、Mg、Mn、Fe、Zn、Cu七种金属元素进行分析测定,并研究了最佳实验条件。在选定条件下,钾的检测限为0.0019μg/mL,钠的检测限为0.0077μg/mL,镁的检测限为0.0024μg/mL,铁检出限为0.0047μg/mL,锌检出限为0.0032μg/mL,铜检出限为0.0052μg/mL,锰检出限为0.0028μg/mL,相对标准偏差为0.54%～3.2%,回收率为94.8%～101.7%。用于中草药中金属元素的测定,简便、省时、准确,结果满意。     

茶叶中水胺硫磷、亚胺硫磷、甲基对硫磷和伏杀硫磷农药残留的高效液相色谱法测定

建立了茶叶中4种有机磷农药──水胺硫磷、亚胺硫磷、甲基对硫磷和伏杀硫磷残留的高效液相色谱测定方法.在45℃加温条件下用乙酸乙酯-正己烷(1◇1,by vol.)混合溶剂提取待测目标物、活性炭层析柱净化,用10.0 mL乙酸乙酯-正己烷(6◇1,by vol.)淋洗待测组分,以Eclipse XDB-C8色谱柱、乙腈-水混合液梯度洗脱分离、二极管阵列检测器测定.结果表明,上述4种农药在6.5 min内能很好地分离;样品中添加的待测组分能定量回收,回收率89.0%~108.0%,相对标准偏差为1.89%~5.96%(1.0μg/mL,n=5),检出限分别为:水胺硫磷9.82μg/kg、亚胺硫磷7.88μg/kg、甲基对硫磷2.19μg/kg、伏杀硫磷0.72μg/kg(dm).     

气质联用测定海洋沉积物中15种邻苯二甲酸酯的含量

提出了气相色谱质谱法测定海洋沉积物中的邻苯二甲酸酯含量的方法。样品依次经正己烷:二氯甲烷(v/v,1:1)、正己烷:乙酸乙酯(v/v,1:1)超声波萃取,再经中性氧化铝固相萃取小柱(1 g,6 m L)净化,用DB-35MS毛细管气相色谱柱分离,质谱检测器检测。15种邻苯二甲酸酯的质量浓度在1~1 000μg/L范围内与相应的峰面积呈线性关系,检出限(3 S/N)在0.1~0.25μg/kg之间。在5.00,50.0,250μg/kg 3个浓度水平进行加标回收试验,回收率在79%~118%之间,测定值的相对标准偏差(n=5)在1.5%~6.3%之间。该方法成功应用于宁波杭州湾(北仑区沿岸、镇海区沿岸)和舟山东极海域采集的海洋沉积物样品检测。     

盐酸沙格雷酯有机溶剂残留量的GC法测定

为了建立气相色谱法测定盐酸沙格雷酯中丙酮、乙醇、四氢呋喃、乙腈、甲苯5种有机溶剂残留的方法,采用内壁涂有PEG-20M的毛细管柱为色谱柱,氢火焰离子化(FID)检测器为检测器,载气为氮气,柱温70℃,汽化室150℃,检测器250℃.在以上色谱条件下,丙酮、乙醇、四氢呋喃、乙腈、甲苯均能得到良好的分离,溶剂对测定无影响,在测试浓度范围内,峰面积与浓度线性关系良好(r>0.991),进样精密度实验的RSD值均小于5.0%,丙酮、乙醇、四氢呋喃、乙腈、甲苯最低检测限分别为0.3μg/mL、0.4μg/mL、0.2μg/mL、0.4μg/mL、0.9μg/mL.本方法简单、准确、灵敏度高,重现性好,可用于该药的有机溶剂残留的测定.     

气相色谱单柱法测定竹节参中20种有机氯农药残留量

为测定竹节参中20种有机氯农药残留,采用超声提取、Florisil硅土柱净化后,采用气相色谱-电子捕获检测器对目标物进行分析测定,内标法定量.结果表明:样品基质3水平添加条件下,20种有机氯农药回收率为68.21%~124.5%,相对标准偏差小于5.64%,检出限为0.009 9~0.049 3μg/kg.该方法快速,准确,灵敏度高,可用于20种有机氯农药残留量测定.     

自动索氏提取-高效液相色谱法同时测定油炸面制品中的16种多环芳烃

采用自动索氏提取法以丙酮:正己烷(1 : 1)混合溶液提取油炸面制品中的乡环芳烃(PAHs),以硅胶固相萃取柱净化,二氯甲烷:正己烷(5:6)洗脱,建立了同时测定油炸面制品中16种PAHs的高效液相色谱-紫外和荧光检测器测定方法.实验结果,在50μg/kg添加水平,PAHs各化合物的回收率为92.5%～106.4%,相对标准偏差(RSD)小于3.21%.16种PAHs化合物检出限为0.8μg/kg～40μg/kg.该方法简便、快速、可同时检测油炸面制品中16种PAHs.     

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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