纳米TiO2-ZnO复合材料的合成、结构与光催化性能

Using ZnSO₄ and TiCl₄ as raw materials， nanometric TiO₂-ZnO (ZnTiO₃) is prepared at 180℃，0.8MPa by hydrothermal method. The effects of the reaction temperature and time on the nanometric TiO₂-ZnO are also dis-cussed. XRD shows that the product is TiO₂-ZnO (ZnTiO₃) with noncrystal phase， and it changes to rhombic form above 870℃. TEM measurement indicates that the TiO₂-ZnO is spherical particles， and the average diameter of the particles is 20nm. The UV light absorption properties are detected by UV spectrophotometer. The results show that the nanometric TiO₂-ZnO has strong absorption at 200～370nm and at visible region. Photodegradation of dyes in an aqueous solution is investigated using nanometric TiO₂-ZnO as a photocatalyst. The results show that after 60min illumination， the decolorization rate of the acidic red B and acidic black 234 dye can be arrived at 100%.     

基体溶液pH值对基体辅助激光解吸电离质谱法测量结果的影响

研究了基体溶液的ｐＨ值对基体辅助激光解吸电离（ＭＡＬＤＩ）的影响，分别测定了从强酸至强碱不同ｐＨ值的α－氰基，４－羟基肉桂酸水溶液的紫外吸收谱，并分别用作基体测定细胞色素Ｃ的相对分子质量。结果显示除按常规配制的基体溶液（ｐＨ＝２５）在激光波长３５５ｎｍ处有强紫外吸收外，其他ｐＨ＝１０、ｐＨ＝８０、ｐＨ＝１００的溶液皆没有吸收，而相对分子质量测定结果是ｐＨ＝１０和ｐＨ＝２５两种溶液可得到质量良好的谱图。而ｐＨ＝８０和１００的两种溶液则得不到谱图，作者还以溶液化学规律，及基体辅助激光解吸电离的机理，对结果进行了讨论。     

Separation and determination of neuraminic acids in nanogram quantities by liquid chromatography — A comparative study with different amino phases

Summary Neuraminic acid derivatives were separated easily by liquid chromatography on amino phases and using acetonitrile/15 mM phosphate buffer, pH 5.2 as mobile phase. Detection at 200 nm allowed determination of substances in the nanomole range. All solvent systems were used isocratically at room temperature. The separation did not depend on ion-exchange but on a partition mechanism, the solutes being separated according to their polarity. Thus, it was possible to optimize the resolution by varying the stationary phase and the composition of the eluent.Part of this work has been presented at the 15th International Symposium on Chromatography, Nürnberg, October 1–5, 1984.     

紫外分光光度法测定地龙中重金属的含量

为地龙重金属限量标准提供依据,采用紫外分光光度法测定了地龙中重金属的含量,分析波长为273 nm.结果表明,赤子爱胜蚓的重金属含量为13.04 μg/g,线性范围0～50 μg,平均加样回收率为99.42%.该法简便、快速、重现性好,能在一次操作中测出中药中大部分重金属的含量.     

不饱和酸酐—吩噻嗪电荷转移络合物结构的探讨

用ＩＲ和ＵＶ两种方法首次研究了吩噻嗪与７个酸酐形成的电荷转移络合物，测定了它们的组成和溶剂效应，并推测出酸酐与吩噻嗪形成电荷转移络合物时相互作用的方式（结构）。     

Degradation of Microcystin-RR by Combination of UV/H2O2 Technique

The experiments were performed to investigate the degradation of microcystins in order to assess the effectiveness and feasibility of UV/H2O2 system for the disinfection of water polluted by microcystins. The influence factors such as H2O2, pH and UV light intensities were investigated respectively. Degradation of microcystin-RR （MC-RR） could be fitted by either the pseudo-first-order or second-order rate equations. This homogenous system could significantly enhance the degradation rate due to the synergetic effect between UV and H2O2. The degradation mainly followed the mechanism of direct photolysis and .OH oxidation reactions. Experimental results showed that 94.83% of MC-RR was removed under optimal experimental conditions and the UV/H2O2 system provided an alternative to promote the removal of microcystins in drinking water supplies.     

苯并五元杂环系列分子的结构与非线性光学性质

采用AM1方法优化分子构型，用ZINDO方法研究了氨基，硝基取代的2－苯基苯并噻唑系列分子的光谱，并在此基础上用自编程序计算了这些分子的二阶非线性光学系数，对取代2－苯基苯并噻唑系列分子的二阶非线性光学系数的影响因素进行了探讨，并在微观上给予解释。     

Photo- and thermoinduced ring opening reaction of 2[(1,3,3-trimethylindoline-2(1H)-yliden)propen-1-yl]-3,3-dimethylindolino[1,2-b]-oxazolidine in polymer films

The influence of UV light and temperature on poly(methylmethacrylate) (PMMA) and poly(vinylchloride) (PVC) films, doped with 2[(1,3,3-trimethylindoline-2(1H)-yliden)propen-1-yl]-3,3-dimethylindolino[1,2-b]-oxazolidine has been investigated. The radiation-induced colour was analyzed spectrophotometrically at the maximum of the absorption peak at 560 nm. The effect of the temperature on unirradiated and irradiated films was studied. The results demonstrate a strong photochromic and a weak thermochromic behaviour of the PMMA and PVC films. The relationship of photocolouration-thermal decolouration is discussed based on the spectral results reported here.     

亚氨基二乙酸的高效液相色谱测定

利用高效液相色谱，采用外标法测定样品中亚氨基二乙酸的含量，紫外检测器检测波长为210nm，色谱柱为SAX强阴离子交换柱，用0．005mol.L^-1磷酸二氢钾缓冲液（PH2．5）为流动相，对样品进行分析，其线性相关系数为0．9996，标准偏差为0．035，回收率为98．5％－101．5％。     

Effect of ultraviolet light and heat on the properties of cotton cellulose

The changes in properties of cellulose brought about by ultraviolet (UV) irradiation, heat exposure and by a combination of both treatments were determined. The methods of characterizing the changes included breaking strength, color, yellowness index, thermal analysis, dye adsorption as a measure of changes in fine structure of the fibers, and Turnbull's Blue test as an empirical measure of carboxyl content. The exposures increased the color and yellowness of the samples as well as the carboxyl content and decreased dye adsorption and breaking strength. A shift of the decomposition endotherm of cellulose to lower temperatures was also noted. It appears that, under the exposure conditions used in this study, the changes in carboxyl content, color changes, yellowness index and breaking strength induced by heat are accelerated by an initial exposure to UV light but still simulate heat ageing alone. There also appears to be a correlation between breaking strength and dye uptake.