析相萃取火焰原子吸收法测定矿样中的锌

非离子表面活性剂的水溶液在温度升高达到其浊点时会形成胶束相析出。文章研究了利用其浊点使待测离子的络合物富集在胶束内一起析出 ,进行析相萃取分离富集后 ,应用火焰原子吸收光谱法测定矿样中锌的新方法 ;着重讨论了采用TritonX 10 0做析相剂、正辛醇降低浊点和析出相的密度以及络合剂的选择、酸度及振荡次数的影响等析相萃取条件。方法检出限为 0 0 0 5 μg·mL-1。用于岩矿中锌的分析测定 ,结果令人满意     

胶原/磷酸钙生物矿化的紫外吸收动力学研究

用紫外分光光度法研究了胶原生物矿化的机理。通过对反应液做定时波长扫描 ,获得一组包含重要过程信息的光谱曲线和动力学曲线。首次发现阶梯形的动力学曲线上出现一个波谷 ,磷酸钙 (磷酸氢钙 )初始浓度增大时 ,波谷增大 ,位置提前。结合波谷前后样品的X射线衍射谱分析 ,指出 :胶原生物矿化过程中 ,相继发生凝胶化和相分离。载钙胶原分子通过新生成的磷酸氢钙进行“点对点”交联 ,在交联网格中磷酸氢钙发生相分离 ,从而产生波谷现象。用该机理解释了胶原矿化中各种紫外吸收的光谱现象。     

Write-once medium with BiOx thin films for blue laser recording

BiOx films are prepared by reactive direct current (DC) magnetron sputtering from a metallic bismuth target in Ar + O2 with different O2/Ar ratios. It is found that the optical property of BiOx films is sensitive to O2/Ar ratios and the films deposited at O2/Ar ratio of 0.5 have the best reflectivity contrast under the same conditions. The structure and optical characteristics of the films are studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and spectrophotometer. As revealed by investigations,the phase transition is mainly responsible for the change of optical properties. The static test results indicate that the BiOx films have good writing sensitivity for blue laser beams. A high reflectivity contrast of about 52% at a writing power of 11 mW and writing pulse width of 800 ns is obtained. In addition, the films demonstrate good stability after being read for 10000 times.     

人膀胱粘膜/粘膜下层组织病变致组织漫反射光谱的变化

研究了人正常膀胱和浅表性膀胱癌的粘膜/粘膜下层组织在300～900nm光谱范围的漫反射光谱特性及其差异,实验采用带积分球附件的分光光度计获取组织的漫反射光谱.结果表明,在300～900 nm,正常膀胱的粘膜/粘膜下层对任一个波长的漫反射率都明显地较癌变的粘膜/粘膜下层对相应波长的要大.正常膀胱的粘膜/粘膜下层的漫反射光谱的峰分别在370 nm、520 nm、550 nm和660nm,其峰值分别为52.4%、60.7%、56.1%和75.5%.而癌变的粘膜/粘膜下层的漫反射光谱的峰分别在320 nm、520 nm、550 nm和660 nm,其峰值分别为43.7%、33.4%、30.6%和70.2%.正常膀胱的粘膜/粘膜下层的漫反射光谱在370 nm处有一个峰,而癌变的粘膜/粘膜下层的漫反射光谱在370 nm处没有峰,320 nm处有一个峰.而正常膀胱的粘膜/粘膜下层的漫反射光谱在320 nm处没有峰.膀胱的粘膜/粘膜下层病变导致组织的漫反射光谱在520 nm、550 nm和660 nm处的峰的峰值分别减小了45.0%、45.5%和7.02%.说明膀胱的粘膜/粘膜下层病变导致组织的组分和结构尤其足组织中的氧合血红蛋白和去氧血红蛋白的含量发生了明显的改变.     

质子辐照聚苯胺的Raman与红外光谱研究

本文用Raman与红外光谱表征质子辐照聚苯胺的结构。聚苯胺的红外光谱的主要吸收峰经低能和高能质子辐照后分别向高频移动2—12cm~(-1)和5—26cm~(-1)。在1228,1344,1380和1444cm~(-1)处的Raman带在低能质子辐照后分别移到1236,1348,1392和1456cm~(-1),在804,1588和1620cm~(-1)处的Raman带,经高能质子辐照后分别移到808,1592和1624cm~(-1)。醌型结构的拉曼线1588cm~(-1)也上移4cm~(-1)。这些结果表明,质子辐照不同于质子酸的掺杂(质子化过程)而是引起聚苯胺中分子链的断裂。     

Electronic speckle pattern interferometry using a CO2 laser

The advantages and problems of using electronic speckle pattern interferometry (ESPI) at longer (infra-red) wavelengths are discussed. The adjustment and use of an ESPI set-up with a CO₂ laser and pyroelectric vidicon are described and illustrated by some experimental results.     

Spectrophotometric verification of biodegradation of phenol in a flow dynamic biocers-based bioreactor system

A quick fingerprint spectrophotometric procedure based on the absorbance in the ultraviolet spectrum region was developed to verify biodegradation of phenol in flowing contaminated water. The procedure was employed to test the functional feasibility of a biocers-packed bioreactor to filter phenol on a bench-scale fluidic dynamic system, which should simulate a macroscopic microorganism-based remediation system. The biocers contained Rhodococcus sp. P1, a phenol degrading bacteria. An influent with initial phenol concentration of 500 mg L^?1 was fed into the bioreactor at different flow rates, and the effluent was continuously monitored for residual phenol concentration by coupling the fluid dynamic system to a UV-vis spectrophotometer. Within 3 days, the effluent from bioreactor reached a minimum residual concentration of phenol of <40 mg L^?1. Therefore, the aim of the current paper is to report results of the procedure for on-line spectrophotometric detection of phenol, and the feasibility of a biocers-packed bioreactor for degradation of phenol.     

紫外可见分光光度计主要技术指标及其检定方法

介绍了紫外可见分光光度计的主要技术指标如波长准确度、波长重复性、光度准确度、光度重复性、杂散光,以及这些指标的检定方法。