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对每次都必须做要保持系统的统一性
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我倒是天天做这些,你得把仪器和背景气说一下,才好。
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自己配还是比较麻烦的 买国产的便宜 可以考虑纳克的
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用MS不失为一有效的方法,灵敏度高干扰少
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计算校正因子,可以消除系统的误差
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从实践中开始1
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前两天我的仪器也出现了类似的问题,发现是正对着空调出风口造成的。把仪器移到离空调远点的地方就好了。还有如果例子线工作不正常也会出现如此现象。
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这个可能是程序的问题,删除程序,重新安装下N2000就可以了,我们这用的也是N2000出现过这个问题,我重新安装了下就好了
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移液管全部送检,容量瓶送一套监测。我们是送到计量院监测
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等离子体点然后,稳定一段时间,开始检测,检测的时候发现有时候等离子体火焰颜色发白光,有时候是红光,不知道具体影响如何?
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一般的HP-5或者DB-624就可以
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这样的情况只能清洗矩管了
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是直线拟合用的算法不同引起的?Excel做出的标线的相对误差有多少?反算后的误差又是多少?
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是不是安装的问题,比如漏气\安装位置不当等.
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对于手动顶空进样达到三个9就不错了,达到四个9很难。
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光谱仪器从某种角度来说都是类似的,只是样品激发或吸收能级差异而已,对仪器来说核心都是分光系统
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方法比对,人员比对,仪器控制如期间核查等
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我现从事的部门主要从事行业职业危害检测与评价,在有毒有害有机气体方面以检测苯系物为主,也从事混合烃、芳香族胺类化合物等的检测。我最主要以苯系物的检测方法与大家讲探讨探讨。
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As is the case with all detectors for gas chromatography, thermal control ofa FID is an important requirement. The block enclosing...
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As is the case with all detectors for gas chromatography, thermal control ofa FID is an important requirement. The block enclosing the detector should beheated above the temperature of the column to avoid the condensation of samplecomponents in the transfer lines and jet. In addition, the temperature must beabove 100 oC to prevent water condensation. Since the temperature of the bodyof the detector has a slight effect on the detection mechanism it must be stable.However, it is more important to keep the detector from getting too hot sincesolid surfaces heated by the flame can emit electrons (i.e., thermionic ionization).For example, a large sample or component that can increase the temperature cancause a positive detector response, including samples or components that otherwisewould have given a negligible response (e.g., CO). Under such conditions,water may give a negative peak, as it decreases the temperature of the flame.Overheating the detector can also lead to electrical leakage across insulators,causing instability in the detector output current.《Modern Practice of Gas Chromatography》
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电流?流速?柱子?HE做载气几十个PPM没问题。