2017-07-05 13:11
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东西分析LC-5510型高效液相色谱仪
型号: LC-5510
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品牌: 东西分析
¥ 10万 - 20万
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AF-7550型双道氢化物-原子荧光光度计
型号: AF-7550
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品牌: 东西分析
¥ 15万 - 20万
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GC-4100系列气相色谱仪
型号: GC-4100
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品牌: 东西分析
¥ 15万 - 20万
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东西分析GC-MS3200型气相色谱(四极)质谱联用仪
型号: GC-MS3200
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品牌: 东西分析
¥ 30万 - 50万
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东西分析AA-7090原子吸收分光光度计
型号: AA-7090
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品牌: 东西分析
¥ 30万 - 40万
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对瞬态分析,同时测量消除了噪声并使灵敏度最大化 电感耦合等离子体-飞行时间质谱(ICP-TOFMS)的准同时测量的属性,使其能够从根本上消除由仪器的漂移和不稳定性带来的噪声(抖动噪声 flicker noise)。在传统的扫描型质量分析器(四极杆质谱仪)上,这些噪声源限制了同位素比率测量的精度。抖动噪声的消除,意味着同位素比率可以测量到离子计数的统计极限(射电噪声极限 shot noise limits)。
作为东西分析的一名实验技术人员,通过本文来为使用原子吸收仪器的用户介绍几种常见的样品前处理方法,以及各种方法适用的样品类型,希望可以让使用者参考借鉴。
根据 GB/T 22388—2008 《原料乳与乳制品中三聚氰胺检测方法》的规定:原料乳、乳制品以及含乳制品中三聚氰胺的三种测定方法,即高效液相色谱法 ( HPLC )、液相色谱 - 质谱 / 质谱法( LC-MS/MS )和气相色谱 - 质谱联用法 [ 包括气相色谱 - 质谱法( GC-MS ),气相色谱 - 质谱 / 质谱法( GC -MS/MS ) ] 。其中标准规定高效液相色谱( HPLC )仪可配有紫外检测器或二极管阵列检测器。 作为国产知名品牌的北京东西分析仪器有限公司,在经过大量实验验证的基础及用户的实际运用,现为您提供配备常规紫外检测器的 LC - 5500 型液相色谱仪及 GC - MS3100 型气相色谱质谱联用仪,配置完全符合《原料乳与乳制品中三聚氰胺检测方法》( GB/T 22388-2008 )要求。
Application of a Quadrupole Mass Spectrometer in the Control of Ethylene Oxide Production Dr. Zbigniew T. Krieger, Extrel CMS, LLC, Pittsburgh, USA Abstract Since mid seventies, mass spectrometry has been used in petrochemical industry to monitor chemical processes and environment conditions. Many successful applications developed, like fermentation, steel, ammonia, VCM/EDC in air. In case of ethylene oxide production, traditional measurement of major compounds in and out of the reactor has been utilized for some time. With high accuracy of quadrupole mass spectrometers, precise calculations of oxygen and carbon balances together with a variety of other process parameters allowed the manufacturer to improve process efficiency and stay within the safe levels of operation. However, it has been known that the activity of catalyst needs to be kept under control by injecting a measured amount of chlorinated hydrocarbons. Process gas chromatographs have been used to measure the chlorides at sub-PPM level. The relatively slow analysis offered by gas chromatographs (minutes) did not allow the direct control of the process within a very thin range of tolerance. Only recently, process quadrupole mass spectrometers offer an excellent analysis of major compounds combined with fast a reliable analysis of chlorides (seconds instead of minutes). This article will present the quadrupole mass spectrometer's application on the ethylene oxide process control, emphasizing the sub-PPM level of chlorides. ......