新显色剂4—（2—苯并噻唑偶氮）焦Bei酚—钨（Ⅵ）—CTMAB反应的光度法研究

本详细地研究了新显色剂４－（２０苯并噻唑偶氮）焦Ｂｅｉ酚与钨（Ⅵ）和ＣＴＭＡＢ的显色反应及配合物结构。实验表明，在ｐＨ２．７时，钨与显色剂反应形成稳定的，带负电荷的１：２紫红色配合物。该配合物的λｍａｘ为５５５ｎｍ，表观摩尔吸光系数为８．８２×１０＾４Ｌ．ｍｏｌ＾－＾１．ｃｍ＾－＾１。所拟定的分析方法已满意地用于钢铁中微量钨的光度法分析。     

仲钨酸铵萃余液中三氧化钨的流动注射测定

基于在强盐酸介质及磷酸存在下钨被三氯化钛还原成钨蓝的性质，建立了流动注射测定仲钨酸铵生产过程萃余液中ＷＯ３的简便新方法。测定波长为６３０ｎｍ，线性范围为０．０１－０．１ｇ．Ｌ＾－１，采样频率为６０样．ｈ＾－１．对含０．０４４ｇ．Ｌ＾－１ＷＯ３的典型试样连续１３次测定，所得相对标准偏差为２．２％。     

桑色素—溴化十六烷基三甲铵—Brij—35荧光光度法测定微量…

研究了在溴化十六烷基三甲铵（ＣＴＭＡＢ）和Ｂｒｉｊ－３５混合表面活性剂的存在下，以桑色素为荧光剂，测定微量钨的新方法。详细研究了反应条件，反应适宜的酸度为０．０６￣０．１２ｍｏｌ·Ｌ＾－１ ＨＣｌ，钨含量在０．０５￣３．２５μｇ／２５ｍｌ范围内呈线性关系，方法的灵敏度高，用于地质试样中钨测定，结果满意。     

6—Br—BTAPC三波长分光光度法同时测定痕量钼和钨的研究

基于Ｍｏ（Ⅵ）和Ｗ（Ⅵ）与新显色剂４－（６－溴－２－苯并噻唑偶氮）邻苯二酚（６－Ｂｒ－ＢＴＡＰＣ）和二苯胍（ＤＰＧ）在ｐＨ４．０时形成稳定的１：２：２电中性紫红色三元离子缔合物的灵敏显色反应，用三波长法同时萃取分光光度法测定了体系中共存的钼和钨，两配合物氯仿萃取液的λｍａｘ分别为５５９和５３９ｎｍ，表观摩尔吸光系数分别为８．６３×１０＾４和６．５３×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，比耳定律的     

动力学—两次标准加入法同时测定钼和钨

本文提出了动力学－两次标准加入法双组份同时测定的新方法，讨论了测定的基本原理；用停流ＦＩＡ光度法研究了钼和钨共同催化的Ｈ２Ｏ２－Ｉ＾－动力学反应体系，并建立了钼和钨同时测定的条件，用本法测定了钢样和模拟样品中的钼、钨含量，结果满意，钼和钨的回收率分别为９７％－１０２．６％和９８．２％－１０３％；相对标准偏差分别为２．８％－３．２％和２．１％－３．５％。     

酸度对胶束配合物形成的影响及钨和锆的连续测定

研究了钨和锆水杨基荧光酮及溴化十六烷基三甲基铵在不同酸度时形成三元胶束配合的差异。在０．１０－０．３０ｍｏｌ．Ｌ＾１ＨＣｌ介质中，二者形成的胶束配合物吸收曲线严重重叠，且在一定浓度范围内吸光度加合性良好；酸度为０．９６－１．２０ｍｏｌ．＾－１ＨＣｌ时，钨配合物吸收曲线无变化，而锆配合物在原波长基本无吸收。     

协同系数补偿—动力学两次标准加入法测定相互干扰的双组份

本提出了协同铲应补偿的动力两次标准加入法，讨论了相互干扰双组份同时测定的原理，研究了钙（Ⅵ）和钨（Ⅵ）催化的Ｈ２Ｏ２－Ｉ＾－动力学反应，确定了同时测定条件：［Ｈ２Ｏ２］＝９．×１０＾－３ｍｏｌ／Ｌ，［Ｉ＾－］＝１．０×１０ｍｏｌ／Ｌ，ＰＨ３．０，２５℃；为补偿钼和钨之间的协同催化效化效应，引入了协同催化系数的概念，有效地消除了吸江度对加和性的偏离。用本法同时测定样品中的钼和钨含量，回收率分别为９     

金属有机化合物中微量钨的测定

本研究了在溴化十六烷基三甲基铵存在下，６，７－二羟基－２，４－二苯骈吡喃氯化物与钨的胶束增敏反应，在０．１６－０．３０ｍｏｌ／Ｌ盐酸介质中，钨与ＤＤＰＢＣ生成红色配合物，其组成比为１：２最大吸收峰在５１５ｎｍ处，摩尔吸光系数ε＝６．４７×±１０＾４。含钨量０－１２μｇ／１０ｍＬ符合比尔定律。用于多种金属有机化合物中微量钨的测定，方法简单，快速，结果满意。     

微乳液介质—1—（2—吡啶偶氮）—2—萘酚光度法测定汽油中环烷酸铁的含量

本研究了微乳液为介质时，铁与１－（２－吡啶偶氮）－２－萘酚（ＰＡＮ）的显色反应。选择７３０ｎｍ处为测定波长，ε为１．４×１０＾４Ｌ．ｍｏｌ＾－＾１．ｃｍ＾－＾１，铁量在０－５０μｇ／２５ｍｌ范围内符合比耳定律，该法适用于汽油中环烷酸铁的测定。     

2—[2‘—（4’—甲基—苯并噻唑）偶氮]—5—二甲氨基苯甲酸与钯（Ⅱ）显色反应…

合成了新试剂２－［２＇－（４＇－甲基－苯并噻唑）偶氮］－５－二甲氨基苯甲酸，并研究了其与钯（Ⅱ）的显色反应。实验表明，在５０％乙醇介质中，该试剂与钯（Ⅱ）反应生成１：１络合物，其最大吸收波长为６９８ｎｍ，表观摩尔吸光系数为５．８３×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１。     

多环芳二酐型聚酯亚胺膜的透气性能

多环芳二酐型聚酯亚胺膜的透气性能李悦生，丁孟贤，徐纪平（浙江大学高分子科学与工程研究所，杭州，３１００２７）（中国科学院长春应用化学研究所）关键词聚醚酰亚胺，聚酯酰亚胺，膜，透气性通常的聚酰亚胺加工性能较差，在芳环二酐的苯环间引入醚键等柔性基团后，其...     

Determination and study on residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil

A QuEChERS (quick, easy, cheap, effective, rugged, and safe) method for the determination of benazolin-ethyl and quizalofop-p-ethyl in rape and soil by high-performance liquid chromatography-tandem mass spectrometry has been developed in this study. The residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil were determined with the developed method. The half-lives of benazolin-ethyl in rape straw and soil were 3.7–5.1 days and 14.3–26.3 days, respectively. The half-lives of quizalofop-p-ethyl in rape straw and soil were 5.0-6.1 days and 0.3–9.7 days, respectively. The residue of benazolin-ethyl and quizalofop-p-ethyl in rapeseed and soil were below the detection limit (i.e., 0.5?mg?kg^?1, the maximum residue level of European Union for quizalofop-p-ethyl).     

微量元素与疾病诊断治疗的研究现状及展望

对国内外微量元素与疾病的关系及其诊断治疗的研究现状及研究动向进行了综述，包括：微量元素与地方病、癌肿、心血管病、糖尿病、眼病、神经系统病等。参考文献72篇。     

Synthesis and Optical and Redox Properties of Symmetric and Asymmetric BODIPYs

Herein, we present the synthetic route and the photophysical, electrochemical as well as laser properties of novel red‐emitting boron‐dipyrromethenes (BODIPYs) bearing arylethyne moieties. Such functionality is added along the main axis of the chromophore leading to single‐ and double‐substituted derivatives. The relationship between the dye structure and the lasing properties is studied in detail with the help of the photophysical and electrochemical properties as well as quantum mechanical simulations. The asymmetric substitution of the parent dye induces inhomogeneities in the charge distribution, which leads to an overall loss of the fluorescence capacity, mainly in polar media. Such non‐radiative deactivation processes can be softened by decreasing the electron‐donor ability of the substituent or even avoided by symmetrical substitution. Thus, grafting of the arylethyne moieties at the longitudinal axis of the indacene core results in an effective strategy to develop red‐edge BODIPYs with highly efficient and photostable laser emission.     

Conformations and steric and stacking interactions of trisubstituted ureas and thioureas with alkyl and phenyl groups

The monomeric ν(N—H) vibrations of various trisubstituted ureas of the R₂UPh type and -thioureas of the R₂TUPh type have been studied. The trans—out isomerism in the former and the trans—out—cis isomerism in the latter are discussed from the point of view of steric effect. The monomeric ν(N—H) vibrations of RPhUPh and RPhTUPh are also examined. The single band appearing in the spectrum of both ureas is characteristic of the cis form; this suggests the existence of phenyl—phenyl interaction (the stacking interaction proposed by Galabov et al. [10]). Behavior of ν(N—H) vibrations at several concentrations is shown to be clearly different in the three forms (trans, out and cis). The presence of the cis form is confirmed by solvent effect experiments.     

Ti-V基储氢合金及其氢化物的物相结构与组分优化设计

Ti-V基储氢合金在室温、常压下即可表现出良好的储氢特性,且质量储氢容量明显高于传统AB₅型储氢合金,从而在氢气的精制和回收、运输和储存及热泵等方面有较早的应用。 此外,在混合气体分离、核反应堆中处理氢的同位素、镍氢电池及燃料电池负极材料等方面也得到了广泛的研究与关注。 基于目前Ti-V基储氢合金的研究现状,概述了该类合金的优势、限制性因素(包括成因)及改性手段。 此外,为了进一步理解Ti-V基合金储氢机理、构建合金组分与储氢特性之间的对应关系,本工作重点围绕Ti-V基储氢合金及其氢化物的结构、组分优化设计展开综述,并对其未来研究方向做出展望。     

Ferrocene and ferrocenium modified clays and their styrene and EVA composites

In this work, ferrocene- and ferrocenium-containing salts were employed to modify montmorillonite. X-ray measurements show an increase in the interlayer spacing upon clay modification, which means that the larger and more organophilic cations were inserted into the gallery space of montmorillonite. Attempts to prepare nanocomposites of polystyrene and ethylene vinyl acetate copolymers lead to immiscible systems; the morphology of these systems was elucidated with TEM, XRD and cone calorimetry. The thermal stability of the composites is greater than that of the virgin polymer.     

钒与糖代谢及糖尿病

微量元素钒作为生物体内必需元素，经证实有很重要的生理学功能，与机体糖代谢有十分密切的关系，且能降低糖尿病动物模型的高血糖，极有可能被开发为治疗糖尿病的药物。     

Synthesis of Tyrosol and Hydroxytyrosol Glycofuranosides and Their Biochemical and Biological Activities in Cell-Free and Cellular Assays

Tyrosol (T) and hydroxytyrosol (HOT) and their glycosides are promising candidates for applications in functional food products or in complementary therapy. A series of phenylethanoid glycofuranosides (PEGFs) were synthesized to compare some of their biochemical and biological activities with T and HOT. The optimization of glycosylation promoted by environmentally benign basic zinc carbonate was performed to prepare HOT α-L-arabino-, β-D-apio-, and β-D-ribofuranosides. T and HOT β-D-fructofuranosides, prepared by enzymatic transfructosylation of T and HOT, were also included in the comparative study. The antioxidant capacity and DNA-protective potential of T, HOT, and PEGFs on plasmid DNA were determined using cell-free assays. The DNA-damaging potential of the studied compounds for human hepatoma HepG2 cells and their DNA-protective potential on HepG2 cells against hydrogen peroxide were evaluated using the comet assay. Experiments revealed a spectrum of different activities of the studied compounds. HOT and HOT β-D-fructofuranoside appear to be the best-performing scavengers and protectants of plasmid DNA and HepG2 cells. T and T β-D-fructofuranoside display almost zero or low scavenging/antioxidant activity and protective effects on plasmid DNA or HepG2 cells. The results imply that especially HOT β-D-fructofuranoside and β-D-apiofuranoside could be considered as prospective molecules for the subsequent design of supplements with potential in food and health protection.