白芍中重金属含量的测定

采用石墨炉原子吸收光度法测定白芍中铅、镉的含量,采用原子荧光法测定白芍中砷、汞的含量,采用电感耦合等离子体原子发射光谱法测定白芍中铜的含量。结果表明为白芍的重金属含量有差异,重金属含量与药材年限无直接关系。研究成果为白芍的质量评价及其发展提供了实验数据。     

葵花粕与葵花籽中微量元素含量的测定

对葵花粕与葵花籽样品进行消解后,采用火焰原子吸收光谱法测定其中铜、锌、铁、锰、银、铅和镉等元素含量,用原子荧光光度法测定其中砷、汞的含量.用离子色谱法测定钙、钾、钠的含量.结果表明,铜、锌、铁、锰等元素在样品中普遍存在.钠、钾元素在样品中含量很高.样品中同时检出一定量的微量金属元素.为葵花样品微量元素的分布提供了科学的依据.     

原子吸收及原子荧光法测定内消瘰疬丸中铅砷汞含量测定

建立测定内消瘰疬丸中铅、砷、汞残留量的。采用微波消解的方法,用石墨炉原子吸收分光光度法测定铅含量,用原子荧光法测定砷汞含量。结果:铅、砷、汞的回收率分别为103.6%、92.5%、92.3%。该方法操作简便、快捷、可用于内消瘰疬丸及类似中成药的铅、砷、汞含量测定。     

铜质火锅使用过程中的金属元素含量分析

探讨酸菜在铜质容器中熬煮,砷、汞、铅、镉、铬、镍、铜等元素含量的变化.以微波消解预处理样品,运用ICP-MS、HG-AFS法测定铜锅熬煮酸菜过程中汤料、酸菜中重金属元素的含量变化.在紫铜锅中熬煮酸菜6 h,可使锅体汞、铅、铜溶出较多,镉、铬、镍少量溶出,基本无砷溶出.其中,汤料中汞、铅、铜、镉、铬和镍分别约增加914%、65%、513倍、55%、46%和60%,酸菜中汞、铅、铜、镉、铬和镍分别增加81%、159%、375倍、19%、142%和70%.从健康角度出发,紫铜锅可能不适宜作酸菜类火锅的烹饪容器.     

微波消解技术在土壤重金属元素测定中的应用

本文阐述了用微波消解-原子吸收分光光度法和原子荧光光度法测定土壤中铜、锌、铅、镉、铬、砷、汞.通过多种消解酸体系实验,摸索出硝酸-盐酸-氢氟酸-过氧化氢(硝酸-盐酸-过氧化氢)最佳土样消解方法.实验结果表明,该方法在分析土壤标准样品中铜、锌、铅、镉、铬、砷、汞时测定结果与保证值基本符合,且重复性较好,是一种用酸量少,简便快捷,环境污染少、准确度和精密度均较高的消解方法.     

原子吸收法测定牛奶中铜镉铅的不确定度评定

对原子吸收法测定牛奶中铜、铅、镉含量的不确定度进行了分析,确定样品消解带来的不确定度是影响测定不确定度的最主要来源.对市售纯牛奶中铜、镉、铅的测定结果分别为32.32±1.94,1.59±0.12,45.30±2.10μg/kg.     

青海湖裸鲤肌肉营养成分和微量元素的分析

采用常规生化分析方法测定了20尾青海湖裸鲤肌肉营养成分,并首次对鱼肌肉中微量元素进行检测。结果显示：鱼肌肉中蛋白质含量为19.28%,脂肪为1.73%,灰分为1.25%,水分为78.38%。在测定的汞、砷、铜、锌、铅和镉6种微量元素中,汞的含量为0.123 4 mg/kg,砷为0.130 6 mg/kg,铜为0.255 mg/kg,锌为2.255 mg/kg,铅为3.485 mg/kg,镉为0.09 mg/kg。其中锌的含量超过国家食品规定标准将近7倍。     

重庆道地金银花中的重金属含量研究

目的:对重庆道地药材金银花的重金属含量进行分析评价,为制定金银花药材重金属含量质量标准提供参考依据.方法:对重庆主产区不同年份、不同品种金银花药材样品的铅、镉、铜含量(石墨炉原子吸收分光光度法)及汞、砷含量(原子荧光法)进行分析.结果:铅的含量为0.158～1.564 mg/kg;镉的含量为0.009～0.069 mg/kg;汞的含量为0.010～0.078 mg/kg;铜的含量为0.162～0.364 mg/kg;砷的含量为0.457～2.172 mg/kg.不同产地、不同品种间铅和砷的差异性较大.结论:金银花药材基本上达到了<药用植物及制剂进出口绿色行业标准>相应的重金属限量标准,可进行规模化种植.     

土壤-小麦系统重金属污染状况与吸收富集行为

对广利灌区两市一县土壤和小麦中镉、汞、铅、砷重金属进行了分析,结果表明广利灌区土壤和小麦受镉、汞、铅、砷污染程度较小,土壤属于清洁,小麦食用安全。土壤中重金属区域差异比较明显,武陟县和济源市土壤中砷含量高,沁阳市土壤中铅、镉含量高。小麦籽粒对镉的吸收积累能力大于铅,对砷和汞的吸收富集能力较小。     

俄色药材的农药残留和重金属含量检测研究

目的:为保证俄色药材的食用和药用的安全性和有效性,对俄色药材农药残留和重金属元素含量的测定方法及控制条件进行研究.方法:采用气相色谱法测定有机农药残留,石墨炉法对铅、镉、砷含量的测定,电感偶合等离子体发射光谱(ICP-AES)法对铜、汞含量的测定.结果:没有检出农药残留和重金属铅,砷,汞,镉(含量低于最低检测限).铜的含量也相对较小,仅为1.162 mg/kg.结论:俄色药材农药残留和重金属元素含量的测定表明俄色样品均符合国家药典标准和我国《药用植物及制剂进出口绿色行业标准》限量指标.     

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.     

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     

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     

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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