β－CORRECTION SPECTROPHOTOMETRIC DETERMINATION OF ALUMINIUM， USING THE AL（Ⅲ）－PF－OP REACTION

β－ＣＯＲＲＥＣＴＩＯＮＳＰＥＣＴＲＯＰＨＯＴＯＭＥＴＲＩＣＤＥＴＥＲＭＩＮＡＴＩＯＮＯＦＡＬＵＭＩＮＩＵＭ．ＵＳＩＮＧＴＨＥＡＬ（Ⅲ）－ＰＦ－ＯＰＲＥＡＣＴＩＯＮ￥ＨｏｎｇＷｅｎＧＡＯ；ＦｅｎｇＺＯＵａｎｄＰｅｎｇＦｅｉＺＨＡＮＧ（ＨｕａｉｂｅｉＥ...     

PREPARATION， ELECTRICAL PROPERTIES AND CRYSTAL STRUCTURE OF TWO NEW CHARGE－TRANSFER SALTS （BEDT－TTF）＿3Cu＿2Brx AND （TTM－TTF） （Cu＿2Bry） （y～4．72）

ＰＲＥＰＡＲＡＴＩＯＮ，　ＥＬＥＣＴＲＩＣＡＬ　ＰＲＯＰＥＲＴＩＥＳ　ＡＮＤ　ＣＲＹＳＴＡＬ　ＳＴＲＵＣＴＵＲＥ　ＯＦ　ＴＷＯ　ＮＥＷ　ＣＨＡＲＧＥ－ＴＲＡＮＳＦＥＲ　ＳＡＬＴＳ　（ＢＥＤＴ－ＴＴＦ）＿３Ｃｕ＿２Ｂｒｘ　ＡＮＤ　（ＴＴＭ－ＴＴＦ）　（...     

STEREOSTRUCTURE OF POLY［4－（2－METHYLPROPENOYLOXY）－4＇－CYANOBIPHENYL］ BY PHOTOPOLYMERIZATION UNDER AN EXTERNAL ELECTRIC FIELD

ＳＴＥＲＥＯＳＴＲＵＣＴＵＲＥＯＦＰＯＬＹ［４－（２－ＭＥＴＨＹＬＰＲＯＰＥＮＯＹＬＯＸＹ）－４＇－ＣＹＡＮＯＢＩＰＨＥＮＹＬ］ＢＹＰＨＯＴＯＰＯＬＹＭＥＲＩＺＡＴＩＯＮＵＮＤＥＲＡＮＥＸＴＥＲＮＡＬＥＬＥＣＴＲＩＣＦＩＥＬＤ￥ＣｈｏｎｇＷｕＬＩ；Ａ...     

THE STUDY ON EFFECT OF PARTICLE SIZE IN BOTANICAL STANDARD SAMPLE ANALYSIS BY SLURRY SAMPLING AND FLUORINATION ELECTROTHERMAL VAPORIZATION（ETV）－ICP－AES

ＴＨＥＳＴＵＤＹＯＮＥＦＦＥＣＴＯＦＰＡＲＴＩＣＬＥＳＩＺＥＩＮＢＯＴＡＮＩＣＡＬＳＴＡＮＤＡＲＤＳＡＭＰＬＥＡＮＡＬＹＳＩＳＢＹＳＬＵＲＲＹＳＡＭＰＬＩＮＧＡＮＤＦＬＵＯＲＩＮＡＴＩＯＮＥＬＥＣＴＲＯＴＨＥＲＭＡＬＶＡＰＯＲＩＺＡＴＩＯＮ（ＥＴＶ）...     

STRUCTURAL EVIDENCE FOR THE METAL ION BRIDGED LIGANDLIGAND INTERACTION：THE X－RAY CRYSTAL STRUCTURE OF ［（2，2＇－BIPYRIDYL）（PHENYLMALONATE）COPPER（Ⅱ）］ TRIHYDRATE

ＳＴＲＵＣＴＵＲＡＬＥＶＩＤＥＮＣＥＦＯＲＴＨＥＭＥＴＡＬＩＯＮＢＲＩＤＧＥＤＬＩＧＡＮＤＬＩＧＡＮＤＩＮＴＥＲＡＣＴＩＯＮ：ＴＨＥＸ－ＲＡＹＣＲＹＳＴＡＬＳＴＲＵＣＴＵＲＥＯＦ［（２，２＇－ＢＩＰＹＲＩＤＹＬ）（ＰＨＥＮＹＬＭＡＬＯＮＡＴＥ）ＣＯＰ...     

ACIDITY AND CATALYTIC ACTIVITY OF KEGGIM STRUCTURE HETEROPOLYACIDS ──EFFECT OF CENTRAL ATOM IN H＿α XW＿（12） O＿（40）

ＡＣＩＤＩＴＹ　ＡＮＤ　ＣＡＴＡＬＹＴＩＣ　ＡＣＴＩＶＩＴＹ　ＯＦ　ＫＥＧＧＩＭ　ＳＴＲＵＣＴＵＲＥ　ＨＥＴＥＲＯＰＯＬＹＡＣＩＤＳ　──ＥＦＦＥＣＴ　ＯＦ　ＣＥＮＴＲＡＬ　ＡＴＯＭ　ＩＮ　Ｈ＿α　ＸＷ＿（１２）　Ｏ＿（４０）ＡＣＩＤＩＴＹＡＮＤＣＡ...     

STUDY ON IN SITU LASER-INDUCED FLUORESCENCE SPECTROELECTROCHEMISTRY OF α,β

ＳＴＵＤＹＯＮＩＮＳＩＴＵＬＡＳＥＲ－ＩＮＤＵＣＥＤＦＬＵＯＲＥＳＣＥＮＣＥＳＰＥＣＴＲＯＥＬＥＣＴＲＯＣＨＥＭＩＳＴＲＹＯＦα，β，γ，δ－ＴＥＴＲＡ（４－ＴＲＩＭＥＴＨＹＬＡＭＭＯＮＩＵＭＰＨＥＮＹＬ）ＰＯＲＰＨＹＲＩＮ￥ＱｉａｎｇＨＵ；ＪｉＭｉ...     

IN－SITU FTIR AND UV－VISIBLE－NEAR－IR SPECTROELECTROOHEMICAL STUDIES OF MIXED－VALENCE ISOPOLYANION Mo＿6O＿（19）￣（3－） IN APROTIC MEDIA

ＩＮ－ＳＩＴＵ　ＦＴＩＲ　ＡＮＤ　ＵＶ－ＶＩＳＩＢＬＥ－ＮＥＡＲ－ＩＲ　ＳＰＥＣＴＲＯＥＬＥＣＴＲＯＯＨＥＭＩＣＡＬ　ＳＴＵＤＩＥＳ　ＯＦ　ＭＩＸＥＤ－ＶＡＬＥＮＣＥ　ＩＳＯＰＯＬＹＡＮＩＯＮ　Ｍｏ＿６Ｏ＿（１９）￣（３－）　ＩＮ　ＡＰＲＯＴＩＣ　Ｍ...     

DETECTION OF SULFHYDRYL GROUPS ON SULFIDED MOLYBDENUM BASED CATALYSTS BY THE REACTION OF THIOLATION OF CYCLOPENTANONE

ＤＥＴＥＣＴＩＯＮＯＦＳＵＬＦＨＹＤＲＹＬＧＲＯＵＰＳＯＮＳＵＬＦＩＤＥＤＭＯＬＹＢＤＥＮＵＭＢＡＳＥＤＣＡＴＡＬＹＳＴＳＢＹＴＨＥＲＥＡＣＴＩＯＮＯＦＴＨＩＯＬＡＴＩＯＮＯＦＣＹＣＬＯＰＥＮＴＡＮＯＮＥＷａｎｇＪｕｎ，ＬｉＷｅｎｚｈａｏ＊（Ｄａｌｉ...     

SYNTHESIS AND CHARACTERIZATION OF NEIV PICKET FENCE CROWN－PORPHYRIN AND ITS Zn（Ⅱ），Fe（Ⅲ） COMIPLEXES

ＳＹＮＴＨＥＳＩＳＡＮＤＣＨＡＲＡＣＴＥＲＩＺＡＴＩＯＮＯＦＮＥＩＶＰＩＣＫＥＴＦＥＮＣＥＣＲＯＷＮ－ＰＯＲＰＨＹＲＩＮＡＮＤＩＴＳＺｎ（Ⅱ），Ｆｅ（Ⅲ）ＣＯＭＩＰＬＥＸＥＳ￥ＹａｎｇｄｅＷＵ，ＦａＣｈｅｎｇＱＩＡＮ，ＬｉａｎＦａｎｇＳＨＥＮａ（Ｄｅ...     

Multicomponent Chemometric Determination of Colorant Mixtures by Voltammetry

Abstract

A quantitative chemometric approach, iterative target transformation factor analysis (ITTFA), was applied to the simultaneous determination of mixtures of four food colorants (Amaranth, Sunset Yellow. Tartrazine and Ponceau 4R) by adsorptive voltammetry. The conventional and first-derivative voltammograms of the quaternary mixtures were used to perform the optimization of the calibration procedure by the ITTFA models. The proposed method was applied satisfactorily to the determination of a set of synthetic quaternary mixtures of colorant in phosphate/citric acid buffers (pH 5.7) and acceptable results were obtained. No significant advantages were found with the application of derivative technique in this voltammetric work.     

Computerized electroanalysis: Part II1. Multiple scanning and background subtraction,a new technique for stripping analysis

A method of registering the pure Faradaic current in anodic stripping voltammetry is described. A computer-controlled voltammetric unit is used. The chemical significance or the voltammograms obtained is discussed. Details of the computer algorithm and results from anodic stripping analysis of metal solutions are given. The design of a mercury-plated glassy carbon electrode is discussed.     

Analysis of powder mixtures with the help of abrasive stripping voltammetry and coulometry

Summary Abrasive stripping voltammetry was applied to the quantitative analysis of the following powder mixtures: MnO₂-FeOOH, HgS-HgO, HgO-PbO. Therefore, g-amounts of the powder mixture were transferred onto a solid electrode and the electrochemical response of the solid sample is recorded. The calibration was made by measuring the percentage peak height of each component taking the sum of peak currents of both components as 100%. The relative standard deviation ranges from 3 to 15%. A calibration-free method based on microcoulometric measurements can be used in the case of powder mixtures of AgCl-AgI. The integration of staircase voltammograms directly yields the charges required to reduce AgCl and AgI and thus also gives the ratio of both components. The relative standard deviation was 10%. Microcoulometric measurements gave evidence that, in abrasive stripping voltammetry, the amount of electroactive substance ranges between 10^–12 and 10^–9 mole.On leave from University of Warsaw, Poland     

迭代目标转换因子分析法在吸附伏安法中的应用──混合色素的同时测定

将迭代目标转换因子分析法应用于混合色素溶液吸附伏安波谱的解析,完成了苋菜红、日落黄、柠檬黄和胭脂红混合色素在磷酸氢二钠-柠檬酸缓冲溶液(pH=5.7)中的吸附伏安法同时测定,取得了较满意的结果。     

优化迭代目标转换因子分析法

本文采有一系列步骤，如优化波长集合与优化标准浓度阵的选择，其目的是为了尽量发掘组份间的内在差异且在计算过程中予以保持，降低组份间相关性来改善迭代目标转换因子分析法的分辨混合体系的性能。应用该优化迭代目标转换因子分析法，对二元稀土和三元氨基酸体系进行光度法多组份同时测定，结果满意。     

Electro-oxidation of CO(chem) on Pt nanosurfaces: solution of the peak multiplicity puzzle

An understanding of the oxidation of chemisorbed CO (CO(chem)) on Pt nanoparticle surfaces is of major importance to fuel cell technology. Here, we report on the relation between Pt nanoparticle surface structure and CO(chem) oxidative stripping behavior. Oxidative stripping voltammograms are obtained for CO(chem) preadsorbed on cubic, octahedral, and cuboctahedral Pt nanoparticles that possess preferentially oriented and atomically flat domains. They are compared to those obtained for etched and thermally treated Pt(poly) electrodes that possess atomically flat, ordered surface domains separated by grain boundaries as well as those obtained for spherical Pt nanoparticles. A detailed analysis of the results reveals for the first time the presence of up to four voltammetric features in CO(chem) oxidative stripping transients, a prepeak and three peaks, that are assigned to the presence of surface domains that are either preferentially oriented or disordered. The interpretation reported in this article allows one to explain all features within the voltammograms for CO(chem) oxidative stripping unambiguously.     

改进的迭代目标转换因子分析研究

本文用非线性迭代偏最小二乘法分解原始数据阵,提出了改进的迭代目标转换因子分析法,大大简化了运算,方法简单、直观、准确.用此法对复方扑热息痛片中三组分(乙酰基水杨酸、扑热息痛及咖啡因)的含量进行紫外光谱测定,结果满意.     

碳纳米管修饰电极-人工神经网络同时检测一氯酚三种异构体

建立了碳纳米管修饰电极-人工神经网络同时检测-氯酚三种异构体的方法.在pH=7.0的磷酸盐缓冲溶液中,邻氯酚、间氯酚和对氯酚在碳纳米管修饰电极上均有一灵敏的不可逆氧化峰.采用微分脉冲溶出伏安法,在优化的实验条件下,邻氯酚、间氯酚和对氯酚的峰电位分别为624 mV、712 mV和632 mV,且浓度分别在2.07～103...     

计时电流的因子分析-法拉第电流与充电电流的分离

基于电化学理论电流公式,用迭代目标变换因子分析法对计时电路曲线进行处理,得到分离的法拉第电流和充电电流成分,对于简单的电极过程,分离效果很好,信噪比得到提高,法拉第电流分量可用于定量分析。     

目标转换因子分析与库检索相结合用于红外混合体系定性分析

将库检索与目标转换因子分析相结合利用抽象浓度的分布信息确定可能解域，其最大可能解即为体系包含的物种。可能解域的确定大大减少了计算量，应用于严重重叠的甲苯和乙苯二组份和苯，甲苯及乙苯三组份混合体系，结果令人满意。