简便快速的硫化氢测定法

本文提出了有一种简易快速测定剂来测定水样中的硫化氢的方法。该法的检出限为０．１ｍｇ／Ｌ，对１．０１ｍｇ／Ｌ的Ｈ２Ｓ样品７次测定的相对标准偏差＜４．１％，１ｈ能测定１２个样品。用本测定了几种水样中的Ｈ２Ｓ含量，回收率为８４％－１０５％。应用它可上标准法的４ｈ左右缩短到５ｍｉｎ；使分析成本降低９／１０；不需配制一系列分析试剂和仪器，只需一支小型塑料管和几片药片，便于渔业水质和环境水质的野外现场监测。     

八配位钇(Ⅲ)-反式-1,2-环己二胺四乙酸配合物NH4[Y(trans-CYDTA)(H2O)2]·4.5H2O的合成及分子结构

In this paper, the molecular and crystal structures of the NH₄[Y(trans CYDTA)(H₂O)₂]·4.5 H₂O(trans-CYDTA=trans 1,2-cyclohexanediaminetetraacetic acid) are reported. The crystal data are as follows: Triclinic system, P1space group,a=0.8599(6)nm,b=1.0021(7)nm,c=1.4370(9)nm,α =88.095(13)°,β =75.559(1)°,γ =88.344(12)°,V=1.1981(14)nm³,Z=2, M=708.68,D_c=1.570g· cm^-3, μ =2.506mm^-1 and F(000)=590. The final R₁ and wR₂ are 0.0571 and 0.1350 for 4205 [I >2.0σ (I)] unique reflections and 0.1007 and 0.1615 for all 4981 reflections, respectively. In the title complex, the anion [Y(trans-CYDTA)(H₂O)₂]^- has an eight coordination structure with distorted square antiprism. The trans CYDTA which acts as a hexadentate ligand with four Oatoms and two Natoms and two H₂O molecules directly coordinate to central metal Y(Ⅲ) ion. It can be known that the Y(Ⅲ) ion can form an eight coordinate compound with aminopolycarboxylic acid ligands in addition nine coordination structure.     

溶胶－凝胶法制备Na_5YSi_4O_（12）及其离子导电性质

用溶胶－凝胶方法制备了钠快离子导体Ｎａ_５ＹＳｉ_４Ｏ_（１２）（简称ＮＹＳ）的纯相，应用交流阻抗谱技术测定了样品的离子电导和离子导电活化能，用扫描电子显微镜对用不同方法制备的样品烧结体表面进行了观察。与传统固相反应法制备的ＮＹＳ离子导体相比，用溶胶－凝胶方法制备的ＮＹＳ烧结体具有较好的界面效应。     

Rapid Fabrication of Hollow SiO2 Spheres with Novel Morphology

The hydrolysis of tetraethoxysilane (TEOS) occurred on the surface of poly(methyl methacrylate) (PMMA) microshperes immediately after these microshperes were prepared in TEOS. Micron-sized hollow SiO2 spheres were obtained by calcination of the coated PMMA microshperes. It was found that the final hollow spheres were constituted by small SiO2 particles.     

毛细管电泳法快速分离和检测肠毒性大肠杆菌

 建立了快速分离和检测引起仔猪腹泻的肠毒性大肠杆菌K88、K99和 987P细菌细胞的毛细管区带电泳方法 ,并进行了腹泻仔猪粪便中肠毒性大肠杆菌的应用检测分析。结果表明 ,在电泳缓冲液为 0 0 5mol/LNa2 CO3 NaHCO3(pH 9 9)、分离电压为 1 4 1kV、检测波长为 2 1 0nm的电泳条件下 ,E coliK88、K99和 987P的细胞分别具有单一、稳定的特征谱峰 ,其保留时间的相对标准偏差RSD≤ 0 9% ;在确定的实验条件下 ,实现了腹泻仔猪粪便中肠毒性大肠杆菌的快速检测分析 ,发现将出生 5d～ 6d的腹泻仔猪粪便引入培养基中增殖后主要检出K88。     

N-甲基丙烯酰-N′-甲基哌嗪在嵌段聚醚氨酯膜上的Co60-γ辐射接枝的研究

The graft copolymerization of N-methacryl-N'-methyl-opiperazine onto segmented polye-therurethane (SPEU) film by Go⁶⁰-r-preirradiation has been studied. It is found that the grafting time varies with structure of different chain extenders. The grafted substrated become opaque, the contact angle drops down and from SEM photographs with salient micrograph showing grafts of macrochain on the surface of SPEU film.     

Pd-Rh型国Ⅲ排放三效催化剂的研制

对满足欧Ⅲ排放限值的Pd-Rh型三效催化剂进行研究开发,测试了新鲜催化剂的空燃比特性和起燃温度特性,并与市场上的欧Ⅲ催化剂在同等条件下老化后的性能进行了比较.对研制的催化剂进行封装总成后,按照GB18352.3-2005标准进行了常温冷起动Ⅰ型和低温冷起动IV型试验,测试结果完全能满足该标准的限值要求.     

新颖的二维超分子化合物[CoⅢ(aea)(2,2''''-bipy)]Cl·H2O的水热合成及结构表征

0IntroductionInrecentyearsgreatattentionhasbeenpaidtosupramolecularchemistryandawidevarietyofnet鄄workshavealreadybeenconstructedbasedupontheprincipleofcrystalengineering[1~3].Usually,variousmultifunctionalorganicligands,bothrigidandflexiblemulticarboxyli…     

Stable, reproducible nanorecording on rotaxane thin films

Stable, reversible conductance transitions and memory effects were observed in solid-state rotaxane-based Langmuir-Blodgett (LB) thin films. Taking advantage of the switching property, we have achieved reproducible nanometer-scale recording dots on rotaxane LB films via voltage application using a scanning tunneling microscope probe. The stable and easily controlled conductance switching makes the rotaxanes a hopeful candidate for nanorecording.