水杨醛肟修饰碳糊电极吸附溶出伏安法测定钯(Ⅱ)的研究

报道了水杨醛肟化学修饰碳糊（ＳＡＭＣＰ）电极的制备,研究了钯（Ⅱ）在该电极上的阴极溶出伏安特性。在ＰＨ２．６的ＮＨ４Ｃｌ底液中,钯（Ⅱ）在－０．７８Ｖ处有一灵敏的阴极溶出峰,峰电流与钯（Ⅱ）的浓度在４．７＊１０＾－８－２．８＊１０＾－５ｍｏｌ／Ｌ之间呈良好的线性关系。     

壳聚糖对Zn2+的吸附性能研究

本文用壳聚糖对Ｚｎ＾２＋的吸附条件进行了研究,探讨了脱乙酰度,分子量,粒度大小,溶液的ｐＨ值,温度,Ｚｎ＾２＋起始浓度和不同锌盐等方面对壳聚糖吸附性能的影响。结果表明：壳聚糖对Ｚｎ＾２＋的吸附具有Ｌａｎｇｍｕｉｒ吸附特征,其吸附最佳条件是壳聚糖脱乙酰度为１００％,锌盐为硫酸锌,Ｚｎ＾２＋溶液ｐＨ值为６．０,起始浓度４－５ｍｇ／ｍｌ。     

壳聚糖在二氯乙酸中的溶致液晶性

制备了不同脱乙酰度和分子量在１－３ ～１５－１ ×１０５ 范围内的壳聚糖样品,并用傅里叶变换红外光谱法（ＦＴＩＲ）和粘度法进行了表征．借助偏光显微镜研究了不同壳聚糖样品在二氯乙酸中的液晶相转变和液晶状态．实验结果表明,分子量在１０５ ～１０６ 范围内的增大使壳聚糖形成液晶相的临界浓度（ Ｃ＊ ） 略有降低;脱乙酰度在７０ ～９０ ％ 范围内,对Ｃ＊ 的影响基本可以忽略．临界浓度的实验值与根据Ｋｈｏｋｈｌｏｖ Ｓｅｍｅｎｏｖ Ｏｄｉｊｋ 理论预示的值比较一致,说明蠕虫链模型可以很好地描述壳聚糖分子链在二氯乙酸中的溶致液晶行为．     

络合吸附波测定痕量钼的研究

在ＰＨ４．５０的０．０５ｍｏｌ／ＬＨＡｃ－ＮａＡｃ介质中,研究了钼（Ⅵ）－邻菲络啉的极谱行为。钼（Ⅵ）－邻菲络啉配合物在２．５次分极谱仪上于－０．５０Ｖ,－０．６７Ｖ处产生两个吸附还原波,后者的峰峰值ｅｐｐ与钼（Ⅵ）浓度在２．０＊１０＾－８－８．０＊１０＾－６ｍｏｌ／Ｌ范围内呈线性关系。     

头孢噻肟钠降解产物在银微电极上示差脉冲阴极溶出伏安法的测定

基于包噻肟钠（ＣＴＸ）在０．１０ｍｏｌ／Ｌ ＮａＯＨ溶液中水浴降解产物含有巯基（－ＳＨ），在ＰＨ４．５ＮａＡｃ－ＨＡｃ介质中，于奶微电极上产生－灵敏的吸附伏安还原峰，峰电位Ｅｐ＝－０．５５Ｖ（ｖｓ．ＳＣＥ）。示差脉冲溶出峰电流与ＣＴＸ浓度在１．０＊１０＾－７－１．０＊１０＾－５ｍｏｌ／Ｌ范围内呈线性关系，方法可应用于模拟样品ＣＴＸ的检测，令人满意。     

蒙脱土修饰电极上某些神经递质的电化学行为

采用不同电化学方法对神经递质多巴胺（ＤＡ）在蒙脱土修饰电极上的行为进行了研究，结果发现，蒙脱土修饰膜地ＤＡ有明显的富集作用。在ＰＨ７．４时，ＤＡ强烈地富集在蒙脱土膜内，并显示完成的伏安响应而抗坏血酸（ＡＡ）和ＤＡＲ的代谢产物３，４－二羟基苯乙酸（ＤＯＰＡＣ）则无任何响应。采用计时库仑法测定了ＤＡ在蒙脱土膜内的表观扩散系数为２．３×１０＾－９ｃｍ＾２／ｓ，并计算了异相速率常数为２．７×１０＾－６ｃｍ     

锗钼杂多酸单扫描极谱法测定枸杞中的微量锗

在ＰＨ８．９的氨性缓冲溶液中,锗钼杂多在示波极谱上,于－１．０５Ｖ（ｖｓ．ＳＣＥ）产生灵敏的吸附波。导数波高与锗 度在６．９＊１０＾－８－５．５＊１０＾－５ｍｏＬ范围内有好的线性关系,检出限为３．５＊１０＾－８ｍｏｌ／Ｌ。用本法测定了中药枸杞中的锗,得到满意的结果。     

筛选免疫药物的单扫描示波极谱法研究

用示波极谱研究了溶血素的溶血活性，在１／１５ｍｏｌＬＮａＨＰＯ４－１．１５ｍｏｌ．ＬＫＨ２ＰＯ（ｐＨ＝７．４）底液中活性溶血素有一灵敏的极谱阴极波，峰电位为－１．８２Ｖ，峰高与溶血素活性在６．０＊１０＾－６－５。３＊１０＾－５ｕｎｉｔ．ｍＬ和５．３＊１０＾－５－２。０＊１０＾－３ｕｎｉｔ／ｍＬ范围内呈线性关系，根据不同药物对抗血清中溶血清形成的不同影响，建立了极谱法筛选免疫药物的新方法。本法简单，     

催化褪色光度法测定痕量钴的研究

研究了在ＰＨ１０．５的Ｎａ２Ｂ４Ｏ７－ＮａＯＨ介质中，痕量钴（Ⅱ）对过氧化氢氧化桑色素初色反应的催化作用，建立了催化动力学光度法测定痕量钴的新方法。方法的线性范围为０－１．２μ／ｍＬ检出限为４．４＊１０＾－１８ｇ／Ｌ。用于水和维生素Ｂ１２中钴的测定，结果满意。     

鲁米诺—双氧水—铬（Ⅲ）化学发光体系测定化探样品中痕量砷

用鲁米诺－双氧水－铬（Ⅲ）化学发光体系结合巯基棉对Ａｓ（Ⅲ）的富集分离，建立了快速的测定化探样品中痕量砷的新方法，检测线性范围为１．０＊１０＾－４－１．０＊１０＾１ｍｇ／Ｌ，检出限为３．４＊１０＾－５ｍｇ／Ｌ。用于实际化探样吕测定，相对标准偏差为５．５＾－９．０％。     

HEPT类化合物的QSAR研究

为定量结构／活性相关性研究提取了量子化学参数,拓扑指数Am,分子连接性指数^mxt及疏水性常数,同时应用正交变换和最佳变量子集算法（Leaps-and-Bonds)进行了变量压缩和选择,进而实施了多元回归分析,并由此结果进行了HEPT类化合物（1－[(2-hydroxyethoxy)methyl]-6-(phenylthio)-thymine derivatives)的结构／活性关系的理论解释,进行了人工神经网络法对于该类化合物的活性预测,其结构明显好于多元回归法。     

From the Micro- to the Macro-: Managing the Conservation of the Warship,Vasa

Sweden's famous warship, Vasa, sank on her maiden voyage in August 1628, and remained on the bottom of Stockholm harbour for 333 years. Raised in 1961, she became the first large-scale wooden object to be treated with polyethylene glycol (PEG). In the summer of 2000 a number of acidic salt precipitations were noticed on the surface of the ship and on wooden artefacts in the storerooms. An international research project has been established to look into the causes of this problem and suggest possible re-treatments. Meanwhile projects are underway to monitor movements in the ship, to build a better support system, and to replace the thousands of iron bolts holding the structure together, while a sophisticated new climate system has recently been installed in the museum.     

液滴荧光传感与计算机联用技术在微量分析中的应用

通过在LS55型荧光-磷光-发光分光光度计上加装液滴产生及调节附件,采用计算机采集与分析处理数据,成功地研制了双通道液滴光化学传感装置.利用葡聚糖凝胶对复合维生素B中不同组分的选择性吸附来达到分离与同时检测的目的,并将其用于复合维生素B药片的分析,取得了满意的结果.     

On the scaling of the interface energy of the liquid clusters in the disordered nanoporous medium

Similarity of the extrusion curves of non-wetting liquid in a nanoporous medium with different initial fill volume fractions is observed experimentally. The similarity can be explained by the scaling of the interface energy and the self-similarity of the infinite percolation cluster of fluid-filled pores. Understanding the physical processes leading to the observed phenomena is a foundation for the development of high-performance devices for damping and energy storage on the basis of such heterogeneous systems.     

光亮剂对银电沉积行为的影响

用电势阶跃法和旋转圆盘电极法 (RDE)以及SEM和XRD测试手段 ,初步研究了光亮剂对氰化体系中银电沉积行为的影响 .研究表明 ,光亮剂的加入并未导致银电沉积成核机理的改变 ,但显著增强了镀液的微观平整效应 ,并且所得镀层的表观光滑程度明显改善 .XRD测试亦同时表明光亮剂的加入并未改变镀层的择优取向     

Influence of the Position of the Connecting Spacer of the Chromophore on the Nonlinear Optical Response

A new chromophore, C1 , based on a similar DπA‐structure as in the FTC ‐chromophore but with a hydroxyalkyl spacer perpendicular to the direction of the dipole moment was synthesized. Both chromophores and the CLD ‐chromophore were used to prepare high T_g nonlinear optical vinyl polymers. The influence of the position of the spacer on the DπA‐system on the NLO response of the resulting polymers was investigated.

     

Using of the Agglomeration-in-liquid for the Technology of the Fine Materials

The content of the fine and ultrafine particles in the raw material results in difficulty of the separation, the loss of the valuable components and ecological contamination. Secondary using of the fine particles is impossible without their granulation. This problem has been solved by the agglomeration-in-liquid method.An agglomeration-in-liquid method is a process to produce agglomerates in a liquid phase from solid particles suspended in the liquid. The surface of solid particles and the binding liquid must be of identical polarity, but the continuous phase must be of the opposite polarity. The water solutions of the surfactant are the binding liquids or the organic liquids.     

On the dependence of the critical supersaturation on the initial undersaturation in the reverse Wilson chamber

The dependence of the critical supersaturation on the degree of the initial undersaturation has been analyzed in detail.This dependence is explained by means of the Richarch-Powell equation, taking into account the dependence of the -ratio upon the partial pressures of the inert gas and the liquid under investigation.     

On bridging the gap between the INDO and the NDDO schemes

A series of approximate LCAO-SCF methods intermediate between the INDO and the NDDO schemes is proposed. The suggestion is based upon the decomposition of integrals in multipole-multipole type interactions.