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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。
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都一样吧,厂家也不会便宜些,那样的话代理如何生存?售后一般都是厂家在做吧。
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你最好看一看国标GB/T17623—1998《绝缘油中溶解气体组分含量的气相色谱测定法》,如果你没有该标准,我可以提供。
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可能是雾化器有点微堵,检查时,顺便将其疏通了。请问,你是怎么检查的?
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DMF不会溶解不锈钢的吧实在不放心,那就用玻璃填充柱好了,不过气相的内部管路还是不锈钢的啊,你要是对不锈钢不放心,那没法用了啊这个柱子大概500-600的价格
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用石油醚不行吗?苯类有毒呀
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用不同含量的标样和内标做样所用的系数不同;应该是你用的系数不对
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信号值突然降低问题多出现于进样系统您测试多久后发现信号降低的?也有可能测试时间太长,信号发生偏移,这种情况需重新做曲线,或是中间夹杂着做质控样。
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若是百分含量的组分,直接用热导检测器就可以,若是ppm级的含量,只能用FID和转化炉做了。
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室内湿度大,用除湿机除湿。
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9790遇到过这种情况,将程序初始化一次就好了!
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关机时,工作站不先正常退出,就直接关电脑。
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好贵的,瓶子加上盖子和垫子估计要8快左右。
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区别可以忽略。
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可能是放大器有问题了,你最好看看衰减是不是可以调节,或者是与放大器的链接信号线有问题
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换个衬管看看。