倒数示波计时电位法同时测定粮食中Cu、Pb含量

在分别含有２ｇ／Ｌ乙二胺与＊１０＾－４ｍｏｌ／Ｌ８－羟基喹啉（Ｏｘｉｎｅ）和０．３ｍｏｌ／Ｌ的氢氧化钠淀粉液中,Ｃｕ＾２＋、Ｐｂ＾２＋具有良好的示波图。其切口电位分别为－０．８５Ｖ,－１２０Ｖ（ｖｓ．ＳＣＥ）,二者相差０．３５Ｖ,能够分辨,可同时测定,本方法应用于大米中Ｃｕ、Ｐｂ含量的同时测定,检出限分别为５．８μｇ／Ｌ（Ｃｕ）、１０．０μｇ／Ｌ（Ｐｂ）,平均回收率为９６．０％、１０２．０％。     

微分电位溶出法连测血清中铜铅镉锌

报道了微分电位溶出法先在０．００２５ｍｏｌ．Ｌ＾－１ＨＣｌ－０．３ｍｏｌ．Ｌ＾－１ＮＨ４Ｃｌ底液中连测血清中Ｃｕ、Ｐｂ、Ｃｄ，再加Ｃａ＾３＋０．６μｇ、０．３ｍｌＮＨ４Ｆ（２ｍｏｌ．Ｌ＾－１）于底液，稀释一倍后测Ｚｎ。Ｃｕ采用标准曲线法，Ｐｂ、Ｃｄ、Ｚｎ采用标准加入法。在选定条件下，四元素的线性关系良好。测试血汪有相对标准偏差≤４．６％，平均回收率为９３．３％－１０１．３％，结果令人满意。     

流动注射—阳离子交换预富集—ICP—AES法在线分析磷矿中钙,镁,铝,铁 …

用７３２型强酸性阳离子交换树脂分离富集,并与改进的流动注射（双流路）相结合,建立了新型、高效的流动注射－阳离子交换预富集－ＩＣＰ－ＡＥＳ在线分析体系。研究了酸度、流速、淋洗剂浓度等的选择、共存离子的干扰情况并应用于矿样的分析。Ｃａ,Ｍｇ,Ａｌ,Ｆｅ各元素的检出限分别为０．９μｇ／Ｌ,０．６μｇ／Ｌ,５．５μｇ／Ｌ,１．４μ／Ｌ;１０次测量的相对标准偏差分别为３．４４％,１．５３％,１．６０％,２．     

简便、廉价的电热原子化器的应用研究

将自制钽丝圈原子化器与原子吸收光谱仪联用,以氩气作保护气,测定了Ｃｄ、Ｃｕ、Ｍｎ、和Ｐｂ,研究这一原子化器的性能。在选定的仪器工作条件下,测定Ｃｄ、Ｃｕ、Ｍｎ和Ｐｂ的特征质量浓度分别为０．７μｇ／Ｌ、１７μｇ／Ｌ、２８μｇ／Ｌ和３１μｇ／Ｌ。对实际样品中的Ｃｕ和Ｍｎ进行了测定,其结果令人满意。该法具有简便、廉价的特点。     

用反相高效液相色谱法分析测定Cd,Hg,Pb和Cu

用直接进样（Ｃ１８柱）反相高效液相色谱法研究了Ｍｅｎ＋－Ｄｚ（二硫腙）体系的色谱行为,建立了同时测定Ｃｄ,Ｈｇ,Ｐｂ和Ｃｕ的分析方法。方法的线性范围为０．０１～２．０ｍｇ／Ｌ,最低检出质量浓度为２．４～５．０μｇ／Ｌ,相对标准偏差为１．８％～９．７％,回收率为９４％～１０３％（Ｈｇ除外）。直接进样反相高效液相色谱法比萃取进样正相液相色谱法更快速,更简便,更容易操作,已用于人发测定。     

银基汞膜电极电位溶出法测定化妆品中的铋、铅、镉

研究了一种测定化妆品中铋,铅,镉的新方法。在乙二胺－盐酸底液中以银基汞膜电极为工作电极,饱和甘汞电极为参比电极,铂电极为对电极,用电位溶出法测定化妆品中的痕量Ｂｉ,Ｐｂ,Ｃｄ。结果表明,当Ｂｉ,Ｐｂ,Ｃｄ的浓度依次在０．２５￣１８００μｇ／Ｌ,０．１￣３６００μｇ／Ｌ,０．０５￣１２００μｇ／Ｌ范围内,与峰高呈良好的线性关系,样品回收率在９７％￣１０５％之间。本法有较高的精密度和准确度,适于在化妆     

磷酸三丁酯色层分离—电感耦合等离子体原子发射光谱法测定U3Si2

本法对Ｕ３Ｓｉ中２２个微量杂质元素的测定，进行了较系统的实验研究，取样１００ｍｇ时，Ａｌ、Ｃａ、Ｃｄ、Ｃｒ、Ｃｕ、Ｆｅ、Ｈｆ、Ｉｎ、Ｍｇ、Ｍｎ、Ｍｏ、Ｎｂ、Ｎｉ、Ｐｂ、Ｓｎ、Ｔａ、Ｔｉ、Ｖ、Ｙ、Ｚｎ和Ｚｒ的测定范围５μｇ／ｇ－８００μｇ／ｇ，回收率为９４％－１０５％，ＲＳＤ（ｎ＝８）０．４％－１．２％。     

树脂预浓集—电感耦合等离子体原子发射光谱在线分析痕量元素C…

本文采用微型高富集柱对膦酰树脂，Ｈ１０９树脂，苯乙烯多胺基膦酸树脂和膦酰胺混杂树脂对Ｃｄ，Ｃｒ，Ｃｕ，Ｐｂ，Ｚｎ等元素预富集性能进行了实验，并对浓集，洗脱及测定的条件进行了选择，建立了一套在线的痕量元素－ＩＣＰ－ＡＥＳ多元素同时测定体系，从而大大提高了分析灵敏度，降低了检出限近一个数量级，Ｃｄ，Ｃｒ，Ｃｕ，Ｐｂ，Ｚｎ在不同树脂下的检出限分别为０，２－０，５ｎｇ／ｍｌ，０．ｄ３－０．６ｍｇ／ｍｌ，＜     

在线流动注射螯合树脂预富集石英缝管增敏火焰原子吸收法测定水中痕量铅

应用高效的在线流动注射螯合树脂预富集石英缝管增敏火焰原子吸收系统直接测定水呈痕量铅。实验用内装２００ｍｇＡｍｂｅｒｌｉｔｅＸＡＤ－４键合的５－磺酸－８羟基喹啉螯合树脂的锥形柱,在ＰＨ９条件下样品流速为８．０ｍＬ／ｍｉｎ,９０ｓ采样,用０．５ｍｏｌ／Ｌ Ｈｃｌ洗脱,在分析速度为３０样／ｈ,获得３６倍的富集,经石英缝管增敏,灵敏度提高达１１５倍,线性范围为０－２００μｇ／Ｌ,检出限为１μｇ／Ｌ。铅含量水平５０μｇ／Ｌ的水样连续测定１１次的相对标准偏差２．５％,可直接测定水体中μｇ／Ｌ级的铅。     

电感耦合等离子体质变法测定高纯氧化铕中Cr,Mn,Co,Ni,Cu,Cd和Pb

报道敢用电感耦合等离子体质谱直接测定高纯氧化铕中Ｃｒ，Ｍｎ，Ｃｏ，Ｎｉ，Ｃｕ，Ｃｄ，Ｐｂ等杂质的方法，选择了仪器工作条件，讨论了谱干扰和基体效应。采用Ｒｈ作内标，减小了基体的影响。本法检出限为０．１２－２．２８μｇ／Ｌ，加标回收率为８８．６％－１０８．３％，相对标准偏差为３．２－７．９％，方法简便，快速。     

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).     

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...     

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。     

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 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.     

含茂基苯并三氮唑基镧系有机配合物的合成及表征

三茂基镧系化合物和苯并三氮唑在四氢呋喃中反应,合成了7个未见文献报道的含茂基苯并三氮唑基镧系有机配合物,经元素分析、IR和MS测定,从有关数据推测了这类配合物的可能结构。