资料摘要
资料下载Abstract: Isoprene emission fluxes were investigated for 12 tree species in and around Beijing city. Bag-enclosure method was used to collect the air sample and GC-PID was used to directly analyze isoprene. Ginkgo and Magnolia denudata had negligible isoprene emissions, while ignificant emissions were observed for Platanus orientalis, Pendula loud, Populus simonii, and Salix matsudana koidz, and other remaining trees showed no sign of isoprene emission. Variations in isoprene emission with changes in light, temperature and season were investigated for Platanus orientalis and Pendula loud. Isoprene emission rates strongly depended on light, temperature and leaf age. ....... click the url {下载全文（PDF文档)} download the file ,at the page top
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粮油安全检测方案
简介：粮油是与人们的生活息息相关的，它是对谷物、豆类、薯类等粮食和油料及其加工成品和半成品的统称。人们的生活离不开粮油，但随着经济的发展，粮油商品市场上的不良现象日益增多，毒大米、地沟油等事件使人谈之色变，威胁到人们的身体健康与饮食安全，因此粮油检验工作是关系到国计民生的大事，不容忽视。 粮油检验方法有很多种，气相色谱、液相色谱、光谱、质谱等检验手段的引入，能够有效快速地检验农药等有机物污染和铅、铬、汞等有害元素污染，为粮油检验提供了可靠的技术力量。
飞行时间质谱(TOFMS)的同时性和全谱能力的优势
简介：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）。
原子吸收样品前处理方法概述
简介：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。
原料乳与乳制品中三聚氰胺检测解决方案(LC、GC-MS)
简介：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。
Extrel在环氧乙烷生产工艺中的应用.doc
简介：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. ......
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