饮料中总砷的测定及其价态形态分析

本文采用新银盐光度法,通过对样品的全消解、改变氢化物发生的介质和酸度等方法,成功地对同一样品中砷总量、砷的价态和砷的形态进行了分析。三价砷和无机砷总量的检出限分别为0.1和0.2ppb(3S),相关系数r_1=0.9995、r_2=0.9998。样品中砷总量(无机砷和有机砷)和无机砷总量(As(Ⅲ)和As(Ⅴ))的回收率分别为95～105%和100%,适用于饮料中超痕量砷的全分析。     

快速沉淀法制备多孔纳米NiO及其电容性质研究

本文提出一种简单、低成本和无污染的快速沉淀法, 在没有添加任何有机试剂的条件下, 制备了高比表面积并具有良好孔径分布的Ni(OH)2, 于300 ℃下焙烧得到了多孔纳米NiO, 它在2.0 mol/L KOH电解液中的单电极比容量约为255 F/g.     

新型三环系稠杂环［1,2,4］-三唑并［1,5-a］［1］-苯并氮杂及［1,2,4］-三唑并［1,5-a］-喹啉的合成

α-四氢萘酮的乙氧羰基腙(1)经LTA氧化, 得到α-偶氮-α-乙酰氧基化合物2. 在AlCl3作用下, 化合物2脱去乙酰氧基产生重氮正离子中间体3, 再经与腈的1,3-偶极环加成、 ［1,2］-迁移扩环、 碱性水解和与苦味酸作用, 得到新型［1,2,4］-三唑并［1,5 a］［1］苯并氮杂苦味酸盐6a~6c. 以2,3-二氢-1-茚酮为底物, 采用相同的合成路线, 合成了1,2,4-三唑并［1,5-a］-二氢喹啉苦味酸盐12a~12c.     

Application of the synergetic luminescence of Eu in time-resolved fluoroimmunoassay

The synergetic luminescence system of europium for time-resolved fluoroimmunoassay has been studied for the first time. The europium label is bound to the antibody with diethylenetriaminepentaacetic acid anhydride (DTPAA). Once the immunoreaction has been completed, the europium is preferentially dissociated from the antibody in the presence of terbium and measured by laser-induced time resolved fluorimetry. As an example, the determination of human IgG was performed. The detection limit for human immunoglobulin G was 0.25 ng/l.     

四卤化碳: 强碱反应体系顺磁共振研究

单电子转移反应是物理有机化学中十分活跃的研究领域之一,现已发现许多有机反应中都存在着单电子转移过程。探讨不同的单电子转移反应体系,了解其中电子给、受体之间的相互作用,不仅对深入了解反应机理有理论     

Preparation of organic/inorganic hybrid nanomaterials using aggregates of poly(stearyl methacrylate)-b-poly(3-(trimethoxysilyl) propyl methacrylate) as precursor

A novel brush-type amphiphilic copolymer of PSMA-b-PTMSPMA was synthesized via ATRP technique. As-synthesized polymer was characterized by GPC and ¹H NMR. It was of interest that the resultant polymer could self-assemble into micelles with different morphologies and sizes in selective solvents by adjusting the copolymer concentrations. These aggregates could be prepared into novel stable organic/inorganic hybrid nanomaterials by the gelation process. The size and structure of these aggregates and the corresponding hybrid nanomaterials were observed by TEM.     

MBTH法测定织物中的微量甲醛

研究了MBTH法测定织物中微量甲醛的原理及条件．甲醛与MBTH反应形成嗪，嗪与MBTH的氧化产物反应生成青蓝色化合物，该青蓝色化合物在635nm处有最大吸收，在最佳条件下甲醛的检出限为0．00l8μg／mL.利用此法测定织物中甲醛的含量，相对标准偏差为0％-2.5％，回收率为96％-105％，结果满意．     

β-环糊精-二次微分简易示波伏安法测定苯巴比妥

在NaOH底液中 ,β 环糊精能够产生灵敏切口 ,且该切口深度随苯巴比妥 β 环糊精包结物量的增加而变浅。根据 β 环糊精的示波特性 ,建立了用二次微分简易示波伏安法间接测定苯巴比妥注射液中苯巴比妥含量的新方法。苯巴比妥的浓度在 2 .5× 10 - 6 ～ 4 .5× 10 - 5mol·L- 1范围内的回归方程为h(V) =4 .5 5 9- 1.381× 10 4 c(mol·L- 1) ,相关系数为 - 0 .9976 ,检出限为 1.5×10 - 6 mol·L- 1。对于 2 .5× 10 - 5mol·L- 1苯巴比妥 5次测定的相对标准偏差为 2 .7% ,回收率为10 2 .1%。与高效液相色谱和其他方法相比 ,此法具仪器简单、简便快速、无需通氮除氧等特点     

Syntheses and Magnetic Properties of Cu（Ⅱ）－RE（Ⅲ） Heterobinuclear Complexes with N，N′－Bis（3－carboxyisalicylidene）－trimethylenediamine

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Blends of amphiphilic trisilanolisobutyl-POSS and phosphine oxide substituted poly(dimethylsiloxane) at the air/water interface

Mixtures of a polyhedral oligomeric silsesquioxane, trisilanolisobutyl-POSS, and a polar silicone, poly(dimethyl-co-methylvinyl-co-methyl, 2-diphenyl phosphine oxide ethyl) siloxane (PDMS-PO), spread as Langmuir monolayers at the air/water interface are used to examine the surface phase behavior and aggregation of trisilanolisobutyl-POSS as a function of silicone composition. Analyses of the surface pressure-area per monomer (Pi-A) isotherms in terms of the collapse pressures and excess Gibbs free energies of mixing indicate the monolayers form slightly negative deviation mixtures. Direct observations of surface morphology with Brewster angle microscopy in the collapsed regime reveal that the governing factor for aggregation is the collapse Pi of the component with a stronger affinity for water. In trisilanolisobutyl-POSS/PDMS-PO blends, POSS aggregates as discrete domains and does not coalesce into larger aggregates or networklike structures for <80 wt % POSS, a feature that is vastly different from a previous study of POSS blended with regular poly(dimethylsiloxane).