固体无机样品的激光等离子体质谱分析

激光等离子体质谱是一种新颖的质谱分析手段，具有灵敏度高，分析速度快，分析范围广，分析结果准确性高等优点。本文介绍了在自制的激光离子体源飞行时间质谱计上，有关催化剂，铝箔，活性碳，岩石等固体无机样品的质谱分析结果，显示了激光等离子体质谱的优越性与广泛的应用价值。     

分析科学中的综合分析—剖析技术进展

本文从分析方法和应用两方面，对分析科学中的一个重要分叉－剖析技术予以综合介绍。从方法论看剖析，它充分体现了分析科学综合性的特点、集分离分析、结构分析和成份分析于一体，全面表征物质的结构和成份信息；从应用方面看，它囊括无机，有机，物化和生化等领域中的分析课题，以材料科学、生命科学和环境科学中的各种复杂样品的分析，因此剖析又是把分析科学与合成，加工和应用技术紧密联系的一种系统工程。它的学科地位和广泛的     

连串反应速差动力学分析中的数据处理方法的研究

连串反应速差动力学分析中的数据处理方法的研究吴新国，蔡汝秀，林智信，程介克（武汉大学化学系，武汉，４３００７２）关键词连串反应，速差动力学分析，比例方程法，肾上腺素，去甲肾上腺素动力学分析在分析化学中的作用和重要性已广为人知［１］，速差动力学分析是其...     

分析化学仪器的重点研究方向

分析化学仪器的重点研究方向是：(1)高通量分析，即在单位时间内可分析测试大量的样品。(2)极端条件分析，其中单分子单细胞分析与操纵为目前热门的课题。(3)在线、实时、现场或原位分析，即从样品采集到数据输出，实现快速的或一条龙的分析。(4)联用技术，即将两种(或两种以上)分析技术联接，互相补充，从而完成更复杂的分析任务。     

利用近红外光谱技术在线检测中药质量

传统的分析技术一般采用离线分析的手段，通常需要对待分析样品进行相应的预处理，存在分析结果滞后的缺陷。近红外技术可以克服这一缺点，使实验室和工厂的产品分析实现在线化，可以在几秒钟内得到待测参数。与反馈控制技术联用后，实现生产过程的在线控制。近红外光谱能够连续测定多个参数，实现绿色分析。     

化学工业出版社新书介绍

《现代涂料仪器分析》 ，《分析化学中的小波分析技术》 ，《毛细管电泳技术及应用》， 《色谱在药物分析中的应用》 ，《色谱质谱联用技术》 ， 《农药分析》[编者按]     

光度分析

本文是《分析试验室》定期评述中“光度分析”的第六篇文章，评述了１９９４．７～１９９６．６期间我国光度分析的概况，内容包括：学术会议，专著，标准，综述，新试业色体系，动力学光度法，萃取，浮选和离心光度法，双波长光度法，其他新光度法，以及这两年我国学者在国际杂志上发表的有关光度分析论文目录，引用文献１３７１篇。     

空气整段间隔流动注射分析中分散度影响因素及性能研究

空气整段间隔流动注射分析中分散度影响因素及性能研究支正良，田笠卿（中国药科大学分析计算中心，南京，２１０００９）（南京大学现代分析中心，南京，２１０００８）关键词空气整段间隔流动注射分析，分散度，铁空气整段间隔ＦＩＡ［１，２］的特点是将注入的试样带首...     

药物免疫分析及其进展

本文对用于检测药物的免疫技术作了概述，并总结了近年来一些分析体系的改进和发展，同时指出了现代药物免疫分析的一些新的发展趋势，其中包括多分析物免疫分析方法，新型均相免疫分析方法，以及色谱、流动注射技术等在药物免疫分析中的应用。免疫分析技术可使今后药物定量检测更为灵敏，快速。     

电离常数的研究动态

当前分析化学已由最初的无机物分析，经历有机物分析而进入生物分析的新阶段，因此，不少基础知识必须进行再研究，以适应新的发展需要。     

Enhanced luminescence of SiO2:Eu3+ by energy transfer from ZnO nanoparticles

ZnO nanoparticles embedded into SiO(2) by an ex situ method were shown to result in stable green emission with a peak at 510 nm compared to the normal peak at 495 nm from micron-sized ZnO powders. Green emission from ZnO nanoparticles was completely suppressed when they were embedded in SiO2 doped with Eu3+. Instead, the f-f emissions from Eu3+ were enhanced 5-10 times by energy transfer from the embedded ZnO nanoparticles to Eu3+. The Eu3+ luminescence increased as the Eu3+ concentration increased from 1 vs 5 mole % (for 10 mole % ZnO). In addition, the intensity increased as the embedded ZnO nanoparticles concentration increased up to 10 mole % (for 5 mole % Eu3+). The effects of phonon mediated energy transfer, quenching by activator interactions between Eu3+ ions, and energy back-transfer from Eu3+ ions to ZnO nanoparticles were discussed.     

Preparation and Optical Characterization of Organoeuropium-Doped Silica Gels

Gels have been investigated as potential matrices for rare earth luminescence. The use of complexing ligands in the sol-gel synthesis of the rare-earth doped glasses has been suggested to improve the rare earth ion luminescence properties in these matrices due to the changes in the local environment experienced by the rare earth ion. In this work, transparent Eu3+-doped gels were prepared from Si(OCH3)4 and fluorinated and/or complex-forming Eu3+ precursors (Eu(fod)3, (CF3 SO3)3Eu, (CF3CO2)Eu · 3H2O, Eu(thd)3 and Eu(acac)3). Results of emission, fluorescence line narrowing and lifetimes studies of Eu3+-doped gels derived from Si(OCH3)4 and fluorinated/chelate Eu3+ precursors are presented. The results were interpreted in terms of the evolution of the Eu3+ fluorescence in systems varying from solutions to the gels densified to 800°C. Analysis of the fluorescence decays of the 5D0 state suggests that the use of the fluorinated Eu3+ precursors reduces the hydrophobic content in the silica gels matrices. FLN studies indicate that Eu3+ clustering occurred in all densified samples.     

Sr2SiO4:Eu3+发光材料的制备及其光谱特性

采用溶胶-凝胶法制备了Sr2SiO4:Eu3+发光材料. 测量了Sr2SiO4:Eu3+材料的激发与发射光谱, 发射光谱主峰位于618 nm处;监测618 nm发射峰时, 所得激发光谱主峰分别为320、397、464 和518 nm. 研究了Sr2SiO4:Eu3+材料在618 nm的主发射峰强度随Eu3+浓度的变化情况. 结果显示, 随Eu3+浓度的增大, 发射峰强度先增大; 当Eu3+浓度为7%时(x), 峰值强度最大; 而后随Eu3+浓度的增大, 峰值强度减小. 在Eu3+浓度为7%的情况下, 研究了电荷补偿剂Li+的掺杂浓度(x(Li+))对Sr2SiO4:Eu3+材料发射光谱强度的影响. 结果显示, 随x(Li+)的增大, 材料发射光谱强度先增大后减小, 当x(Li+)为8%时, 峰值强度最大.     

Analytical performance of luminescent immunoassays of different format for serum daidzein analysis

Two sensitive competitive-type solid-phase immunoassays for serum daidzein analysis have been developed and optimized. The first is a chemiluminescent enzyme immunoassay that uses black polystyrene microtiter wells in which daidzein-specific antibodies raised in rabbits are immobilized and a daidzein derivative is coupled to horseradish peroxidase (HRP) as a label. The HRP activity of the antibody-bound tracer is measured with an enhanced chemiluminescent system (luminol/H2O2/enhancer). The second immunoassay is based on the use of bovine serum albumin-daidzein derivative immobilized on microtiter plates and a secondary anti-rabbit IgG-Fc fragment conjugated with 4,7-bis(chlorosulfophenyl)-1,10-phenanthroline-2,9-dicarboxylic acid (BCPDA). Formation of the complex Eu3+-BCPDA enables time-resolved fluorescence-mode detection of the amount of antibody bound to the immobilized antigen. Both methods fulfilled all the requirements of accuracy and precision. The detection limit was the same for each method, 10 pg/well; this is better than that of other immunoassays. The specificity of the two methods was different, because of their competitive-type mechanisms. The performance of the chemiluminescence method is better, because the cross-reactivity of the main interfering compound (genistein) was 5%, compared with 25% for the time-resolved fluoroimmunoassay.     

Potential of a metal-organic framework as a new material for solid-phase extraction of pesticides from lettuce (Lactuca sativa), with analysis by gas chromatography-mass spectrometry

The metal-organic framework (∞)[(La(0.9)Eu(0.1))(2)(DPA)(3)(H(2)O)(3)] was tested for extraction of pyrimicarb, procymidone, malathion, methyl parathion and α- and β-endosulfan from lettuce, with analysis using GC/MS in SIM mode. Experiments were carried out in triplicate at two fortification levels (0.1 and 0.5?mg/kg), and resulted in recoveries in the range of 78-107%, with RSD values between 1.6 and 8.0% for (∞)[(La(0.9)Eu(0.1))(2)(DPA)(3)(H(2)O)(3)] sorbent. Detection and quantification limits ranged from 0.02 to 0.05?mg/kg and from 0.05 to 0.10?mg/kg, respectively, for the different pesticides studied. The method developed was linear over the range tested (0.05-10.0?μg/mL), with correlation coefficients ranging from 0.9990 to 0.9997. Comparison between (∞)[(La(0.9)Eu(0.1))(2)(DPA)(3)(H(2)O)(3)] and conventional sorbent (silica gel) showed better performance of the (∞)[(La(0.9)Eu(0.1))(2)(DPA)(3)(H(2)O)(3)] polymeric sorbent for all pesticides tested.     

利用中空纤维膜器从铕中分离杂质锌

利用中空纤维膜器，采用逆流循环萃取法，用二（2，4，4-二甲基戊基）硫代膦酸（Cyanex302)从硫酸溶液中萃取分离锌和铕。探讨了膜萃取的反应机制，考察了料淮酸度、萃取剂浓度等因素对传质系数的影响，提出利用动力学竞争可以实现锌、铕混合组分的分离。研究了不同酸度、不同配比以及膜器串联的不同级数等条件对锌、铕混合物分离的影响。采用单级萃取时，只有锌被萃取，而铕不被萃取，且锌的萃取不完全；当采用膜器二级串联，经过100min后锌的萃取率达到94.92%，而铕的萃取率仅为8.59%；当采用膜器三级串联时，经过40min后，锌的萃取率达到99.9%以上，而铕的萃取率仅为6.53%。     

铈掺杂对BaFBr:Eu2+光激励发光性能的影响

采用一步反应法制备了BaFBr:Eu2+,Ce3+X射线影像存储材料.通过荧光光谱和光激励发光谱研究了材料的光致发光及其经X射线辐照后的光激励发光性质.结果发现,Ce离子的掺入使得BaFBr:Eu2+的发光性能明显增强,存在Ce3+离子向Eu2+离子的能量传递,Ce离子的掺杂浓度为0.7%(摩尔分数)左右时可得到较高的光致发光及光激励发光强度.且掺入Ce3+后,可以有效的形成能稳定存储的较低能级的电子陷阱,使得在信息读出过程中所需激励光能量降低,从而使得读出光的能量与价廉、便携的长波激光器的读出波长匹配得更好.     

Spectroscopic study of a UV-photostable organic-inorganic hybrids incorporating an Eu3+ beta-diketonate complex.

New europium and gadolinium tris-beta-diketonate complexes have been prepared and incorporated in sol-gel-derived organic-inorganic hybrids, named di-ureasils. The general formula [Ln(btfa)3(4,4'-bpy)(EtOH)] (Ln=Eu, Gd; 4,4'-bpy=4,4'-bipyridine; btfa=4,4,4-trifluoro-1-phenyl-1,3-butanedione) for the complexes was confirmed by X-ray crystallography and elemental analysis. The ground-state geometry of the Eu3+ complex was calculated from the Sparkle/AM1 model. The calculated quantum yield obtained from the Sparkle model and from the crystal structure (both 46%) are in satisfactory agreement with the experimental value (38+/-4%). In the isolated complex the most efficient luminescence channel is S0-->S1-->T-->(5D1, 5D0)-->7F0-6, where the exchange mechanism dominates in the energy-transfer channel T-->(5D1, 5D0). For the Eu3+-based di-ureasils a 50% quantum yield enhancement compared to the Eu3+ complex is observed, which suggests an effective hybrid host-metal ion interaction and an active energy-transfer channel between the hybrid host and the Eu3+ complex. The Eu3+-based di-ureasils are photostable under UVA (360 nm) excitation, whereas under UVB (320 nm) and UVC (290 nm) photodegradation occurs.     

SrMgB6O11:Eu3+纳米材料的水热法制备及发光性能研究

采用水热法制备了Eu3+掺杂SrMgB6O11纳米发光材料.利用X射线粉末衍射仪(XRD)、场发射扫描电子显微镜(FESEM)和荧光光谱对SrMgB6O11:Eu3+样品进行表征.结果表明:采用水热法可以成功地合成粒度均匀、结晶完好的SrMgB6O11:Eu3+纳米发光粉.深入研究了反应温度和pH值对SrMgB6O11:Eu3+纳米材料的晶体结构及形貌的影响.结果表明,在120℃时形成了尖锐且强度最强的衍射峰,同时FESEM也表明此时所得材料为纳米棒组成的规则扇形形貌,此后随着温度的升高,XRD图中衍射峰的位置和强度发生变化,说明荧光粉的晶体结构发生变化,FESEM也表明该荧光粉已变为球形颗粒.归属了发射光谱和激发光谱中各激发峰所对应的能级跃迁.荧光光谱也显示:反应温度和pH值影响着Eu3+在晶格中的对称性,且反应温度为120℃及pH值为9时,Eu3+在晶格中的对称性较好.另外,还初步探讨了纳米粒子的生长机制.     

Schiff碱铕配合物的合成及性质

在甲醇中合成了2-乙酰基苯并咪唑缩牛磺酸Schiff碱型配体及其与Eu(Ⅲ)的配合物。 通过Eu化学和元素分析、质谱、核磁共振谱、红外光谱、激光拉曼光谱、三维荧光光谱,确定了配体与配合物的组成及结构。 Eu(Ⅲ)配合物为Eu2L3(NO3)3(L=C11H12N3O3S)。 配合物荧光发射主要是Eu3+微扰的配体发光,其次为中心Eu3+离子的窄带发射。 当λex=330.0 nm时,配合物发射Eu3+离子的特征窄带荧光;当λex=410.0 nm时,Eu3+发射λem=525.0 nm的荧光。