原子吸收法测定饮料中总酸度

本文研究了用原子吸收法间接测定饮料中总酸度的方法。用ＭｇｎＨ４ＰＯ４悬浮液同有机酸作用，离心沉降未反应的试剂，用ＡＡＳ测定上清液中的Ｍｇ，可间接测定有机酸的总量，用本法测定了饮料样品中的总酸度。测定结果相对偏差小于５．３％，加经在９１－１０４％之间。本法测定结果与酸碱滴定法的结合符合。     

石墨管内被测原子间的平衡关系

本文探讨了石墨管内被测原子间的平衡关系,从理论上推导了基态原子数与吸光度之间的系数β,计算了部分元素的理论特征量N值.     

Inorganic-Organic Cross-Linking in UV Curable Hard Coats Based Upon Vinyltriethoxysilane-Tetraethoxysilane-Polyfunctional Acrylate Hybrid Polymers: A Raman Spectroscopic Study

Hydrolysis, polycondensation and UV-induced radical polymerization processes in binary and ternary mixtures of vinyltriethoxysilane (VTEOS), tetraethoxysilane (TEOS), and several polyfunctional acrylates as reactive diluents were studied by means of FT-Raman and confocal micro-Raman spectroscopy. The study comprises measurements on sols, gels, xerogels, and thin films applied on top of glass slides and polymeric substrates. Characteristic Raman bands are utilized to gain information about the structural evolution, inorganic network connectivity, and organic cross-linking reactions. Supplementary, ²⁹Si-NMR spectroscopic data are considered and correlated with Raman data. Structure-property correlations based on spectroscopic and mechanical data are outlined and discussed. It is demonstrated that thin hybrid polymer films may be studied in-situ by means of confocal micro-Raman spectroscopy.     

Adsorption Study of Methane on Activated Meso-carbon Microbeads by Density Functional Theory

A combined method of density functional theory (DFT) and statistics integral equation (SIE) for the determination of the pore size distribution (PSD) is developed based on the experimental adsorption data of nitrogen on activated mesocarbon microbead (AMCMB) at 77K. The pores of AMCMB are described as slit-shaped with PSD.Based on the PSD, methane adsorption and phase behavior are studied by the DFT method. Both nitrogen and methane molecules are modeled as Lennard-Jones spherical molecules, and the well-known Steele‘s 10-4-3 potential is used to represent the interaction between the fluid molecule and the solid wall. In order to test the combined method and the PSD model, the Intelligent Gravimetric Analyzer (IGA-003) was used to measure the adsorption of methane on the AMCMB. The DFT results are in good agreement with the experimental data. Based on these facts,we predict the adsorption amount of methane, which can reach 32.3ω at 299K and 4 MPa. The results indicate that the AMCMBs are a good candidate for adsorptive storage of methane and natural gas. In addition, the capillary condensation and hysteresis phenomenon of methane are also observed at 74.05K.     

需氯量试验对净水消毒的指导作用

在一定试验条件下，对使用液氯作净水消毒的水进行需氯量试验，所得结果作为加氯量的参考，取得了良好的效果。     

绿色化学实验

绿色化学实验的研究和设计将实现对环境没有或只有很少负作用的理想与目标 ,微型实验、小量 -半微量实验、微波化学实验和计算机辅助的绿色化学实验设计是实现这一目标的一些可能途径。     

离子色谱法在氢燃料电池汽车用氢气中的应用现状及展望

氢燃料电池汽车用氢气中痕量杂质会影响氢燃料电池的性能,国内外标准均严格规定了痕量杂质的限值要求。离子色谱法（IC） 具有操作简单、分析快速、灵敏度高、选择性好、可多组分检测的特点,ISO 14687－2∶2012、SAE J2719∶2015和GB/T 37244－2018等标准均涉及到离子色谱法分析其中的部分指标。目前离子色谱法在环境空气、固定污染源废气、天然气、烟气等气体分析领域有广泛应用,在氢燃料杂质的分析领域尚在起步阶段。该文综述了氢燃料和其他气体分析领域中总卤化物、甲酸、氨和总硫化物的分析方法,将离子色谱与不同分析技术进行比较。并基于离子色谱在其他气体杂质分析领域的应用进展,对其在氢燃料电池汽车用氢气杂质分析中的应用作出展望。     

Ni/ZrO2复合电沉积机理的研究

研究了在Ｗａｔｔｓ镀镍液中ＺｒＯ２颗粒与镍复合电沉积的阴极电流密度以及颗粒在镀液中分散量对颗粒共析量的影响，探讨了复合电沉积的过程与模型。研究表明，在小的颗粒分散量下，复合电沉积为颗粒向阴极的传输所控制，导致共析量随电流密度增大而减少。在大的颗粒分散量，小电流密度时复合电沉积为颗粒的强吸附过程所控制，致使共析量随电流密度增大而增加；大电流密度时，复合电沉积为颗粒向阴极的传输所控制，造成共析量随电流     

半经验分子轨道法的电子密度拓扑分析（Ⅱ）

化学反应过程中的过渡态结构及氢键的拓扑性质,是近年来刚刚涉及的课题,本文讨论了文献[1]的方法对偏离平衡构型的过渡态结构及超分子体系的可用性问题及对计算精度较敏感的电子密度拉普拉斯量的拓扑特性。     

Chromatographic peak broadening with a lab-made splitter: Reproducibility and accuracy studies

Sample inlet splitters are used in capillary column gas chromatography. We have investigated the sample band broadening in the splitter and studied reproducibility and accuracy in quantitative analysis using a simple lab-made splitter. It was found that the results were dependent upon the operating conditions such as split ratio, splitter temperature, glass wool plug, injected sample volume and solvent.