黄山野菊花中总黄酮含量的测定

采用分光光度法,以芦丁为标准品,对产于皖南黄山山脉的黄山野菊花中总黄酮含量进行了测定。黄山野菊花中总黄酮含量以芦丁计为6．29%,平均加样回收率为101．8%,RSD为0．28%。方法简便、快速、重现性好,可作为检测黄山野菊花中总黄酮含量的一种方法。     

恒温水浴紫外光照射仪研制与应用

根据姊妹染色单体色差染色材料处理的性质和特殊要求,研制一种能够高效分辨姊妹染色单体色差和互换的仪器——恒温水浴紫外光照射仪。经过大范围连续使用与测试结果表明,该仪器操作简便,安全稳定,样品玻片处理均匀,姊妹染色单体染色清晰,色差明显,分辨率高。     

Ba2CaB6O12：Eu^2＋蓝色荧光粉的高温固相反应制备与光谱性能研究

采用高温固相反应法合成了含Eu^2＋的硼酸盐蓝色荧光粉,测量了该荧光粉的真空紫外（VUV）及紫外（UV）激发光谱和相应的发射光谱．研究结果表明,在真空紫外和紫外光激发下Eu^2＋离子在该基质均呈现f→d的宽带跃迁,其峰值位于437nm和467nm处,分别对应于基质中Ba^2＋和Ca^2＋格位上的Eu^2＋离子．在真空紫外区域160nm和200nm附近,有两个弱的窄带,来自于基质里BO3^3-基团和Ca—O的吸收,基质和激活离子之间存在着能量传递。     

Light-induced color changes and chemical modification of treated and untreated chestnut wood surface

Abstract

The aim of this work is to study the surface modifications of chestnut (Castanea sativa Mill.) wood by reflectance spectrophotometry and Fourier transform infrared spectroscopy (FTIR) in order to understand the mechanisms that cause changes and to suggest possible solutions to avoid degradation phenomena. The experimental data were statistically treated to evaluate their significance. Concerning the surface protection of wood, starting from the results obtained by testing different commercial products, attention was focused on a novel organic preservative/consolidant product (Linfoil^®) that has attracted great interest in the field of conservation of wooden artifacts. Color monitoring showed that wood surface color undergoes an important variation due to photoirradiation, occurring within the first 24 hours and mainly due to L* decrease and b* increase. Though the protective treatment modifies wood color, nevertheless the product tested seems to protect the wood surface by reducing photoyellowing. FTIR analysis indicated that irradiation caused the degradation of lignin and increased the concentration of the chromophore groups on the wood surface. Changes in the chromaticity coordinates can be linked to the degradation of lignin and to increase of the concentration of carbonyl groups.     

β—环糊精与香精包合物的制备及紫外光谱和差热分析

制备了β－环糊精与薄荷、玫瑰等７种香精的包合物,在紫外区有吸收峰的香精,其紫外光谱与包合物水溶液的紫外光谱的峰形一致,保持香精浓度不变,β－环糊精的加入对最大吸收的波长和吸光度的影响很小,香精包合物的差热分析表明,除玫瑰和菠萝香精包合物外,其他５种香精的包合物在温度低于２３０℃的条件下是稳定的。     

有机锡聚合物水解速度的测定

采用了双波长分光光度法测定水溶液中有机锡含量,方法简单、快速、准确度高.双三丁基氧化锡在0-6.36μg/ml范围内服从比耳定律,其摩尔吸光系数为1.65×104L·mol-1·cm-1.应用该法对顺丁烯二酸甲基三丁基锡(MTBTM)与乙酸乙烯酯(VAC)和丙烯酸甲酯(MA)两种共聚物的水解速度进行了测定.     

电子效应,空间效应,溶剂效应对紫外光谱的影响

紫外光谱的λmax及εmax受电子效应空间效应 ,溶剂效应的影响所呈现的规律     

Mo(Ⅵ)-DBPF-PVA分光光度法测定尿蛋白

提出了一个借钼(VI)-4,5-二溴苯基荧光酮(DBPF)-聚乙烯醇(PVA)与蛋白质显色反应光度法测定微量尿蛋白的分析方法.在pH=2.0,牛血清蛋白能与Mo(VI)-DBPF- PVA形成紫红色络合物,最大吸收波长为570nm,牛血清蛋白含量0-5μg/mL范围内服从Beer定律.尿液中其它成份不干扰测定.用拟定的方法测定人尿蛋白,获得满意结果.     

Fe3+-KSCN分光光度法测药物中的维生素C

还原型维生素C能使[Fe(SCN)x]^3-x血红色溶液褪色。本研究以此为基础建立了用分光光度法测维生素C的新方法。维生素C的质量浓度在0～403．2mg／L范围内服从比耳定律。本法在HAc—NaAc体系中用于药物中维生素C含量的测定，回收率在92．1％～102．9％之间。     

明胶光度法测定废水中银

研究银与明胶在pH8发生反应,形成的复合物经抗坏血酸还原形成淡黄色液体,在415 nm波长处有最大吸收峰,表观摩尔吸光系数为1.2×104L.mol-1.cm-1.银含量在0~20μg/mL范围内服从比尔定律.此方法用于废水中微量银的测定.