测定水中痕量Cr(Ⅵ)的电渗泵顺序注射分光光度法

采用电渗泵顺序注射－分光光度法对水中痕量Cr(Ⅵ）进行了测定,方法通过改变电渗泵流量,流动方向及阀注入时间,实现试剂和样品的定量注入和反应时间的控制;泵工作电压为直流200V,流量为0．45mL/min显色剂采用二苯碳酰二肼,显色剂进样时间为30s,样品进样时间为15s,反应生成的紫红色配合物在540nm处检测,该法线性范围为0．010－1．20mg/L Cr(VI),检出限为3．4μg/L,应用该法成功地进行了地表水中Cr(Ⅵ）的测定。     

#电渗泵流动注射系统测定水中氟

对电渗泵的原理及其在流动注射系统中的应用特点作了详细讨论，并用氟试剂分光光度法测定了自来水中氟化物含量。     

一种新的顺序注射分析系统测定水中亚硝酸根

采用电动流动分析系统的顺序注射分析法测定了自来水中亚硝酸根含量。该系统由一台电渗泵和两个是橛三通阀组成,均由计算机控制,实现了准确,重现和自动的分析要求,测定亚硝硝态氮的线性浓度范围为0．10－0．800mg/L,检出限为1μg/L（3σ,n=11）。本方法每小时能够测定40个样品。     

顺序注射催化动力学光度法测定废水中的痕量酚

在硫酸介质中,利用酚催化溴酸钠氧化桔花青的反应,联用顺序注射技术建立了顺序注射催化动力学光度法测定废水中痕量酚的新方法。方法的线性范围0．4—3．5mg／L,检出限0．1mg／L。该法测定快速简便,常见共存物干扰小,消耗试剂量小,减少了二次污染,用于工业废水中的痕量酚的测定,并与4-氨基安替比林比色法对照,结果无显著差异。     

基于电渗驱动的微流控芯片顺序注射分析系统

本文介绍了一种在微流控芯片上依靠电渗驱动完成顺序注射分析的新方法。采用由多个双T通道构成的微通道网络,利用夹流进样和电渗流驱动方法,在通道内形成间隔排列的溶液区带,进而在流动过程中实现溶液区带间的相互混合。实验以荧光素溶液与硼砂缓冲液为模型体系,初步考察了利用该系统实现顺序注射进样及混合的效果。该方法装置简单,操作简便,无需任何复杂机械装置,利用微流控芯片上的微通道网络及电渗流控制,实现了亚纳升级的溶液区带的顺序排列和进样。     

电渗泵在微柱液相上的应用

 设计评价了一种能够取代机械泵的电渗泵 (EOP) ,该泵可以产生 2 0MPa～ 6 0MPa的输出压力和几十nL/min～ 3μL/min的输出流量 ;用乙腈 水作为流动相 ,在 14cm× 32 0 μmi d (C18,5 μm )微柱上分离了萘、蒽、菲3种物质的混合试样 ,证明EOP在微柱液相领域有广阔的应用前景。     

顺序注射分析及其应用

本文回顾了顺序注射分析的发展过程,对其概念,理论、技术及应用进行了综述,上用文献七十会篇。     

电渗泵-流动注射在线稀释法在火焰原子吸收光谱分析高浓度样品中的应用

采用电渗泵流动注射-火焰原子吸收法(FI-FAAS),研究了高浓度镁样品的在线稀释和分析.电渗泵在低流量时有很好的稳定性.利用控制采样时间的办法,可以准确采集微量样品,在线稀释.同时使用 T 型管对雾化量进行补偿,在线稀释倍数可达 10000 以上,相对标准偏差＜ 1.5% (n=6).通过改变采样电压(速度),载流速度和采样时间可以方便地得到不同的稀释倍数,测定速度可达 100个/h 样品以上.     

双模高压电源在填充型电渗泵流量控制中的应用

研制了两台填充型电渗泵,利用双模对接高压电源可以产生0～60kV超高压,通过提高操作电压,增加了泵系统产生的流量,给出了电渗泵在高电压范围内电压与流量的关系曲线。实验结果表明,电压与流量在高压范围内仍呈线性关系,线性相关系数达到0.9996。同时,通过条件优化,克服了焦耳热,使电渗泵在高电压范围内稳定运行。     

顺序注射停流分光光度法测定痕量碘

食物中碘的含量一直是人们关注的问题,研究食物中微量碘的分析方法具有重要的现实意义.目前测定碘的方法主要有色谱法[1,2]、荧光法[3,4]、分光光度法[5,6]等.     

Principle of a Multistage Electroosmotic Pump and Its Application in Microfluidic Chip

In the past decade, a variety of microfabricated pumps and fluid-handling systems based on ultrasonic, electricity, light, magnet and heat actuated technologies were reported[1], which could be classified into two groups: membrane-displacement pumps and field-induced flow pumps. An advantage of field-induced flow pumps over the former is that they do not require moving parts, such as check valves which complicate the fabrication, sealing, and operation of the systems.     

左旋咪唑的流动注射在线萃取光度分析研究

本文报道了左旋咪唑的流动注射在线萃取分析研究,采用光度检测法于420nm的波长处测定了左旋咪唑及其制剂的含量。其线性范围为3～30μg/ml,平均回收率为99.5％,相对标准偏差为0.81％。最低检出浓度为0.3μg/ml。方法简便,分析速度可达60次/h,分析结果同标准方法相吻合。     

加速溶剂萃取-气相色谱-质谱法测定固体废物中酚类化合物

提出了气相色谱-质谱法测定固体废物中12种酚类化合物残留量的方法。样品以丙酮-二氯甲烷(2+3)混合液为萃取剂,经加速溶剂萃取仪提取后,在K-D浓缩装置上浓缩至1 mL,经硅胶柱净化后,用丙酮-二氯甲烷(1+9)混合液淋洗后再经K-D浓缩至1 mL,通过HP-5 MS石英毛细管色谱柱(30 m×0.25 mm,0.25μm)分离,采用电子轰击离子源选择离子监测模式进行质谱测定。12种酚类化合物的检出限(3S/N)在9.60～18.5μg.kg-1之间。以空白土壤样品为基体进行回收试验,测得回收率在74.7%～108.4%之间,测定值的相对标准偏差(n=7)均小于7.5%。     

电渗泵—流动注射在线稀释法在火焰原子吸收光谱分析高浓度样品中？…

采用电渗泵流动注射－火焰原子吸收法（ＦＩ－ＦＡＡＳ）,研究了高浓度镁样品的在线稀释和分析。电渗泵在低流量时有很好的稳定性。利用控制采样时间的办法,可以准确采集微量样品,在线稀释。同时使用Ｔ型客对雾化量进行补偿,在线稀释倍数可达１０００以上,相对标准偏差〈１．５％（ｎ＝６）。通过改变采样电压（速度）,载流速度和采样时间可以方便地得到不同的稀释倍数,测定速度可达１００个／ｈ样品以上。     

流动注射在线萃取荧光法测定痕量阴离子表面活性剂

报道了痕量阴离子表面活性剂的流动注射在线萃取荧光分析方法．该方法测定的线性范围为 ０．０１～０． ２０ ｍｇ／Ｌ；进样频率为 ２０样／ｈ．应用本法测定了水样中痕量阴离子表面活性剂，得到了满意的结果．     

Determination of Phenolic Compounds in Waste Waters by Sequential Injection Analysis and Spectrophometry

Abstract

A sequential injection analysis (SIA) system based on oxidative coupling of phenolic compounds with 4-aminoantipyrine (4-AAP) in alkaline solution and spectrophotometrical measuring of the absorbance at 510 nm has been developed for the determination of phenolic compounds in wastewaters. The proposed system is fully automatized and is able to monitor phenolic compounds in samples at a frequency of about 24 samples per hour with a relative standard deviation (RSD) better than 0.6%. The calibration graph is linear between 0.05 and 25 mg.dm^?3.     

GC Analysis of Organic Acids and Phenols Using On-Line Methylation with Trimethylsulfonium Hydroxide and PTV Solvent Split Large Volume Injection

The combination of on-line methylation using trimethylsulfonium hydroxide with large volume injection of 100 μL was evaluated for the analysis of organic acids and phenols in water. Solvent split injection was applied with complete evaporation of the solvent before analytes were transferred onto the GC column. Despite complete solvent removal, losses were very low compared to conventional splitless injection even for volatile acidic compounds such as propionic acid and phenol. This is explained by intermediate formation of low volatility trimethylsulfonium salts of the analytes which were held in the injector for long evaporation times of up to 10 min, if the evaporation temperature was as low as 10°C. Using a simple liquid/liquid extraction procedure, volatile fatty acids, dicarboxylic acids, benzoic acids and phenols could be detected in 5 mL of water at concentrations of 0.04–0.1 μmol/L with GC/MS in full scan mode. Lactic, pyruvic, and also malonic acids could only be detected at higher levels because of their limited extractability from water as well as their poorer methylation yields. The method provides an easy way to sensitively detect acidic compounds of medium to high volatility in water. It was applied for screening of organic acids and phenols in batch cultures of anaerobic bacteria of which one example is shown.