CLY—1型测氯仪

库仑分析由于分析速度较快,装置简单,目前已被广泛地应用于原子能工业、冶金、石油化工、医药、食品等各个领域的分析。库仑分析法可分为控制电位库仑法和恒电流库仑滴定法,本仪器采用恒电流库仑法。一、工作原理测定原理遵循法拉第定律:     

RPP-200Br溴价溴指数测定仪在石油产品分析中的应用

采用微库仑法,利用RPP-200Br溴价、溴指数测定仪测定石油产品的溴价和溴指数,操作简单方便、避免化学滴定法剧毒试剂的使用,对操作条件进行讨论,对方法的回收率和精密度做试验,结果表明方法的精密度和准确度较高,适合工业生产中使用。     

库仑法测试COD的研究与探讨

介绍库仑检测分析仪的研究与探索过程,说明其关键技术;说明仪器配套前处理的方法及仪器的组成部分。在同等实验条件下,对比分析库仑检测分析仪法与国标滴定法,探讨库仑检测分析仪的分析特点和发展前景。     

微库仑滴定法测定液体石油烃中的硫醇硫和硫化氢

介绍了用微库仑滴定法测定液体石油烃中的硫醇硫和硫化氢的方法。先测两者总量,除去硫化氢后,再测硫醇硫。方法简单、快速,节约试剂,不需要标定滴定溶液。     

LC-4原油水含量测定仪的研制

基于无吡啶卡尔费休试剂作电解液的微库仑滴定法的工作原理,研制了一台LC-4原油水含量测定仪。实验表明,该仪器具有操作简单、节省时间和试剂、测量下限低的优点,既可用于原油水含量测定,又可用于原油盐含量测定。     

LC-4D化学需氧量测定仪的研制

介绍了自行设计的LC-4D化学需氧量测定仪的工作原理（基于闭管消解-微库仑滴定法）,仪器组成,主要电路结构,仪器特点,主要工作参数及实验结果。目前该仪器已用于环保、水处理、石油化工等部门,使用结果令人满意。     

恒电位库仑计

一、概述库仑分析法的基础是法拉第电解定律。库仑分析法有恒电位法(即控制电位法)和恒电流法两种。本文仅介绍我们研制的一种恒电位库仑计。早期的恒电位库仑计只是一种用十分简单的手控电路和电位差计构成的装置,操作麻烦,分析时间长,精度低。为了简化分析手续,提高分析速度和精度,Boomen 首先采用运算放大器制成控制电位库仑计,获得了良     

电化学分析方法在黄酮含量测定中的应用

在查阅文献的基础上,介绍了黄酮含量的电化学测定方法,包括库仑滴定法、极谱法、高效毛细管电泳等,旨在为黄酮类化合物的研究、开发、应用提供参考.     

WKL—3型微库仑定硫仪最佳操作条件的选择

本文简要介绍WKL-3型微库仑定硫仪的基本原理,对影响仪器测定结果的诸多因素进行分析,利用正交设计法设计实验,确定了WKL-3型微库仑定硫仪的最佳操作条件.     

2种方法检测天然气中总硫含量优选

以氧化微库仑法和氢解速率计比色法检测天然气中总硫含量,分别设定实验最佳条件,对不同浓度天然气标样和天然气样品进行检测。结果表明,氢解速率计比色法检测天然气中总硫含量比氧化微库仑法检测的结果偏高,重复性、再现性均比后者好,加标回收率也明显高于后者。     

影响电位滴定法测定石油产品溴值准确度的原因及提高方法

电位滴定法测定石油产品的溴值,以死停终点法指示反应终点,在实际操作过程中经常会出现重复性差、准确度低的情况,本文主要从空白实验、滴定参数、终点判定、样品量等方面进行了讨论。以期找出影响准确度的原因,并提出解决办法。     

Comparison of bromine and permanganate as ultrastructural stains for lignin in plants infected by the fungus Colletotrichum lagenarium.

Transmission electron microscopy (TEM) and energy dispersive X-ray microanalysis (EDS) were used to localize manganese from KMnO4, and bromine, as ultrastructural stains for lignin in an herbaceous plant. The Spookie cultivar of pumpkin is susceptible to infection by the fungus Colletotrichum lagenarium and served as a model system to compare the Br and KMnO4 techniques. Bromine was used in a fixation/staining procedure, and in separate experiments, KMnO4 was used as either a fixative or as a postsection stain. The technique for using bromine was modified from the woody plant procedure by adding a paraformaldehyde prefixation step. With the bromine procedure, cell walls were well-preserved, but the cytoplasm was heavily extracted. The KMnO4 procedures produced well-fixed cytoplasm, but with some staining artifacts. With all procedures, EDS dot mapping demonstrated lignin deposition in the cell walls specifically associated with sites of fungal infection. Lignin was also localized in secondary walls of tracheary elements, sites known to be highly lignified. The bromine procedure provided the most specific localization of lignin with a minimum of artifact. The specific applications of these stains provided data on the ultrastructural localization of lignin which contributed to the elucidation of its role in the interactions between pathogenic fungi in both their resistant and susceptible plant hosts.     

A method of measuring oil consumption by labelling with radioactive bromine

A method of determining the oil consumption rate of combustion engines is presented. It is based on labelling the individual oil fractions of engine oil with radioactive bromine isotope⁸² Br and on the quantitative absorption of radioactive bromine compounds in the exhaust gas in an aqueous solution of nitric acid and silver nitrate. The advantages of this method are that the oil that is consumed in the exhaust gas can be directly measured, without the fluctuating amounts of oil in the sump influencing the result, and the behaviour of the individual components of the oil in the consumption process can be determined. The test is quick, only twenty minutes being required to detect oil consumption at one operating point; and with a single labelling, the oil consumption at a great number of working engine points can be measured ⁸² Br has a short half‐life of only 36 h, so that compliance with radiation protection measures is inexpensive and investigations can be carried out using a conventional testing device. As part of the research project, a study was made of the influence of different base oil types, with and without polymer additives, on consumption. Results showed that Noack evaporation loss correlated with oil consumption only with boiling fractions of exactly the same base oil, and not with different, in particular synthetic, base oils; that polymer additives (VI improvers) significantly reduced the rate of oil consumption; and that the polymer additive and the type of base oil both had more influence on oil consumption than viscosity.     

Surface characteristics of photoaligned polyimide film interfacial reacted with bromine or ethanethiol

The surface characteristics of polyimide films containing cinnamate groups which promote the uniform alignment in adjacent liquid crystal (LC) upon photodimerization by linearly polarized ultraviolet (LPUV) lights were studied [M. Schadt, K. Schmitt, V. Koznikov, V. Chignirov, Jpn. J. Appl. Phys. 31 (1992) 2155. [1]]. But photoalignment methods have an image sticking problem by un-reacted photosensitive functional groups, which can be a severe defect to achieve high reliability of liquid crystal display (LCD) panels. So the un-reacted photosensitive functional groups were deactivated using bromine or ethanethiol. Bromine and ethanethiol lead to the formation of carbon-bromine or carbon-sulfur bonds from carbon-carbon double bonds. The interfacial reaction of bromine or ethanethiol on the polyimide surface has been studied using in situ X-ray photoelectron spectroscopy (XPS). The change of surface tension was observed by using a contact angle analyzer. The photoelastic modulator (PEM) was used to analyze the optical anisotropy on the polyimide surface. Also, the atomic force microscopy (AFM) was used to observe the morphology of polyimide surface [K. Rajesh, M.K. Ram, S.C. Jain, S.B. Samanta, A.V. Narliker, Thin Solid Films 325 (1998) 251. [2]].     

斩波电路电流检测方法

提出了1种基于MOSFET开关管的斩波电路电流检测方法,利用MOSFET导通电流与电压的关系,考虑了温度对MOSFET的导通阻抗的影响,根据MOSFET导通阻抗与温度关系曲线,设计1种具有温度补偿功能的斩波电路MOS-FET导通电流检测方案,取代了传统的电流传感器检测方法。实验结果证明,该检测方法测量精度高,成本较低,具有很高的实用价值。     

功率均分控制下并联逆变器功率检测方法研究

针对"功率均分方式控制的逆变器并联系统在轻载运行时,受到传感器精度的影响,系统无法准确检测出功率,从而影响并联控制性能"的问题,将以滤波电感电流代替输出电流检测功率的方法应用到功率均分控制方法中。首先对采用传统的功率检测和采用电感电流进行功率检测的方法时传感器精度对采样电流的影响进行了对比分析,然后并针对采用电感电流进行功率检测方法对功率均分控制的影响进行了讨论;最后在Matlab仿真平台上对功率均分控制下使用两种采样方法得到的功率检测效果进行了仿真对比。研究结果表明,在系统额定运行时,分别采样电感电流和输出电流并进行功率检测时,两种检测方法对系统电压调节的效果基本相同;在系统轻载运行时,用电感电流代替输出电流进行功率检测可以降低传感器精度对控制方法的影响,改善对系统环流的抑制效果。     

Automatic Detection Instrument for the Ratio of Chlorine to Bromine in Oxidized Liquid of Bromine Production Based on Fuzzy Method

In the process of bromine production, because of lag adjustment methods, there are problems of adjusting delay, raw material wastage and low growth rate. By considering the nature of bromine production, with the help of fuzzy data processing method, computer detection and display technique, we designed an automatic detection instrument for the ratio of chlorine to bromine in oxidized liquid of bromine production. This instrument can be used to detect the different parameters of raw materials adjustment and control in real time, and afford assurance that raw materials will be adjusted in time. This paper briefly introduces the working mechanism,hardware and software design of the instrument.     

TIMS（Triton）测定质量范围的扩展及其在溴同位素测定中的应用

稳定溴同位素可用来识别和评价地下水的来源、成因及其形成的水文地球化学与物理过程。由于热电离质谱仪Triton的加速电压是固定10 kV不可调节的,因此,其最大的测定质量数为310 u。为了测定质量数更高的Cs₂Br⁺（m/z 345,347）离子,本研究通过对热电离质谱仪Triton加速电压单元的改造,成功地将加速电压由10 kV降低到8 kV,使可测定的离子质量数从310 u扩展到350 u。在此基础上,建立了在8 kV加速电压下相应的质量校正曲线,进行了基于¹³³Cs₂⁷⁹Br⁺（m/z 345）和¹³³Cs₂⁸¹Br⁺（m/z 347）离子的稳定溴同位素静态多接收测量。结果表明：当溴含量低于10 μg时,测定结果偏低;当溴含量高于10 μg时,测定结果正常。该方法测定溴同位素具有涂样量少（10~20 μg Br）,测定外精度高（0.09‰~0.18‰）和采集数据时间短（8 min可采集100 个数据）等优点,可为地质样品中溴同位素地球化学的研究提供参考。     

基于高浓度测量的溴气传感器研究

描述了目前溴气传感器的国内外发展状况,介绍了一种用于高浓度测量的溴气传感器,阐述了它的工作原理,针对电极﹑透气膜﹑电解液等关键技术进行了讨论,给出了它的结构,讨论了性能特点.     

LC-4通用微机库仑仪的研制

研制了用微机控制和处理数据的通用库仑仪.介绍了仪器的组成和设计特点,给出了仪器的性能指标和测量精度.仪器可广泛用于各种样品中总硫、总氯、微量水分、溴价和溴指数、硫醇和硫化氢、氯离子和盐含量以及化学需氧量等的测定.