气相色谱仪检定装置的使用方法

依据JJG 700–1999《气相色谱仪检定规程》介绍气相色谱仪检定装置的使用方法。检定项目包括载气流速稳定性、柱箱温度稳定性和程序升温重复性、衰减器换挡误差以及检测器的灵敏度。给出了热导检测器(TCD)、火焰离子化检测器(FID)、火焰光度检测器(FPD)、电子俘获检测器(ECD)和氮磷检测器(NPD)检定时的色谱条件及使用注意事项。正确使用气相色谱仪检定装置能保证仪器测量数据的准确可靠。     

气相色谱仪计量检定中的问题及对策

探讨了实验室气相色谱仪检定规程在实际运用中存在的几个问题及相应的对策。     

气相色谱仪检定规程的研讨

为进一步增强气相色谱仪检定规程的合理性,对JJG 700-1999规程的适用性进行了分析,明确了规程修订的目的和意义,并对需要修改的项目及内容进行了研讨.     

气相色谱仪FID检定过程中的常见故障及排除

气相色谱仪氢火焰离子化检测器（FID）检定过程中常见故障为仪器无法正常点火、仪器进样重复性差、仪器基线噪声漂移大,对这些故障原因进行了分析并提出了解决办法。     

气相色谱仪计量检定中的问题及对策：谭业辉

探讨了实验室气相色谱仪检定规程在实际运用中存在的几个问题及相应的对策     

关于气相色谱仪检定的几个问题

在对气相色谱仪进行检定的过程中,遇到了有关色谱柱,标准样品,积分仪和色谱数据工作站数据采集等实际问题,为了既不影响生产工艺分析任务的进行,又能及时完成对仪器性能的检定工作,采取了相应的措施和办法,较快地完成了对气相色谱仪的检定,并对某些测试数据进行了比较和讨论。     

液相色谱仪检测器新规程的检定方法与特定条件汇总

介绍新版本液相色谱仪检定规程(JJG 705–2014)中3种变动较大检测器的检定方法,如荧光检测器、示差折光率检测器、蒸发光散射检测器。对检定不同厂家检测器设定的特定检定条件进行了汇总。     

液相色谱仪检定规程JJG 705–2014解读

将液相色谱仪检定规程JJG 705–2014与JJG 705–2002在检定方法、检定条件、技术指标三个方面进行对比并说明更改的缘由,对新规程进行详细解读,重点介绍新规程变化内容,最后介绍增加蒸发光散射检测器的缘由及指标。新规程使检定方法更合理,提高了检定效率,满足了市场发展的需要。     

液相色谱仪示差折光率检测器的检定

以配置日本岛津制作所生产的RID–10A示差折光率检测器的液相色谱系统的检定为例,介绍了按照新版液相色谱仪检定规程JJG 705–2014的要求对液相色谱仪示差折光率检测器进行检定的过程。说明了检定方法更改的原因、新方法的优点及所解决的问题,总结了检定过程中的注意事项。     

First-generation hybrid MEMS gas chromatograph

The fabrication, assembly, and initial testing of a hybrid microfabricated gas chromatograph (microGC) is described. The microGC incorporates capabilities for on-board calibration, sample preconcentration and focused thermal desorption, temperature-programmed separations, and "spectral" detection with an integrated array of microsensors, and is designed for rapid determinations of complex mixtures of environmental contaminants at trace concentrations. Ambient air is used as the carrier gas to avoid the need for on-board gas supplies. The microsystem is plumbed through an etched-Si/glass microfluidic interconnection substrate with fused silica capillaries and employs a miniature commercial pump and valve subsystem for directing sample flow. The latest performance data on each system component are presented followed by first analytical results from the working microsystem. Tradeoffs in system performance as a function of volumetric flow rate are explored. The determination of an 11-vapor mixture of typical indoor air contaminants in less than 90 s is demonstrated with projected detection limits in the low part-per-billion concentration range for a preconcentrated air-sample volume of 0.25 L.     

Perkin-Elmer introduce new gas chromatograph

Abstract

APPLICATIONS OF MASS SPECTROMETRY TO TRACE ANALYSIS. Ed. S. Facchetti, Elsevier, US $78.75, Dfl. 185.00.

QUANTITATIVE AQUATIC BIOLOGICAL INDICATORS. by David J. H. Phillips, Fisheries Research Station Aberdeen, Hong Kong, POLLUTION MONITORING SERIES (1980), 488 pages (including 99 figures, 103 tables, 44 pages of literature references up to 1978, an author index of 10 pages, a species index of 4 pages, and a subject index of 18 pages), linen, format 228 × 148 mm, ISBN 0-85334-884-7, Applied Science Publishers Ltd., London, £26.

DIRECTORY OF POLLUTION CONTROL EQUIPMENT COMPANIES IN WESTERN EUROPE, Third Edition (1980), 588 pages (including an index of 127 pages, which is however-structured somewhat arbitrarily according to types of equipment and according to countries), stiff paper cover, format 210 × 147 mm, ISBN 0 906685 00 1, European Directories, a Division of Inter Company Comparisons Ltd., 23, City Road, London EC1Y 1AA, £30.

HALOGENATED BIPHENYLS, TERPHENYLS, NAPHTHALENES, DIBENZODIOXINS AND RELATED PRODUCTS, by R. D. Kimbrough (ed.) (Elsevier Biomedical Press, R.V., Amsterdam, NL. U.S. $95.00, Dfl 195.

CHROMATOGRAPHY AND THE ENVIRONMENT, Environmental problem solving using gas and liquid chromatography, R. L. Grob and M. A. Kaiser, Elsevier, Amsterdam, 1982, XII + 240 pages, ISBN 0-444-42065-7     

A gas chromatograph with plasma reactor

Summary A plasma reactor has been developed, which is inserted into a gas-chromatographic flow system so that any effluent emerging from the first column can be routed through the plasma and the resulting products separated in a second column. Plasma processing is based, typically, on a weak,-stimulated argon discharge, and a variety of doping gases can be added to provide different chemical environments. The resulting product patterns are characteristic of the compounds processed and can serve analytical or physiochemical ends.

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Zusammenfassung Ein Plasma-Reaktor wurde entwickelt und so in ein gaschromatographisches System eingebaut, daß ein beliebiger Peak aus der ersten Säule durch den Reaktor geleitet und seine Abbauprodukte auf einer zweiten Säule aufgetrennt werden können. Das Plasma basiert im typischen Fall auf einer milden,-stimulierten elektrischen Entladung in Argon, zu dem andere, chemisch reaktive Gase zugemischt werden können. Die Art und Verteilung der entstehenden Produkte ist charakteristisch für die abgebaute Substanz und kann zu analytischen und physiko-chemischen Zwecken herangezogen werden.

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Presented at the International Symposium on Microchemical Techniques 1977, Davos, Switzerland, May 1977.     

Design and construction of a computer-controlled gas chromatograph

Summary Usually computers are coupled to chromatographs or similar apparatus for data acquisition and handling. This by no means limits the potential uses of computers in experimental analytical chemistry. The advantage of introducing the computer in closed loop controls results from the shorter equilibrium time, the lack of long-term drift, the reduction in fluctuations. Control programs can be adjusted to new equipments or equipments of different design, by changing some lines or numbers. The performances of programs operating after different principles are compared. A completely automatic chromatograph incorporating a closed-loop computer control of temperature and an analog pressure control system in which the computer can adjust the setting point is described.     

Glass column connector for a gas chromatograph

A cheap glass—metal connector is described for use with glass columns, to avoid the problems of O-rings or special ferrules. The device is valuable in gas chromatography of amino acid derivatives.     

Viscosities of carrier gases at gas chromatograph temperatures and pressures

Summary Equations are derived for viscosities of H₂, He, N₂ and Ar for use at chromatographic temperatures which are accurate to within 0.3% for H₂, and 0.1% for the other gases. The effect of pressure is usually negligible but may increase the viscosity of N₂ or Ar by as much as 0.5% at 25°C or lower and 5 atm or higher.