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今日新聞                              日期：2022/6/21

氣相色譜儀出部分反峰：指大部分峰為正向出峰，但一部分峰為反向出峰，或基線往負(fù)方向偏移。

 

A.使用空氣壓縮機(jī)時(shí)，檢查確認(rèn)反向出峰或基線往負(fù)方向偏移是否與空氣壓縮機(jī)的動(dòng)作(空氣壓力不足時(shí)空氣壓縮機(jī)自動(dòng)動(dòng)作)在時(shí)間上是否同步。

 

B.較多水份進(jìn)入離子化檢測器時(shí)，火焰的燃燒狀態(tài)短時(shí)間會(huì)起變化，伴隨出現(xiàn)反峰(這不是異常)。

 

C.檢查各種氣體的流量設(shè)置是否正常，以及是否存在漏氣現(xiàn)象。　

 

D.檢查載氣的純度，如果載氣里面有微量不純物，而樣品的純度如果比載氣的純度G，就會(huì)出反峰。

 

E.氣路切換時(shí)有壓力沖擊，也會(huì)出現(xiàn)反峰，此時(shí)氣路中應(yīng)加接穩(wěn)壓裝置?！　?img src="https://img74.qqzzao.com/mt0024/5/20220625/637917154506202799758.jpg" width="300" height="300" border="0.1" hspace="0" vspace="0" title="" style="width: 300px; height: 300px; margin: 0px; border: 0.1px solid; float: right;">

 

F.使用TCD時(shí)，如果載氣和樣品的熱導(dǎo)系數(shù)過于接近，也會(huì)出現(xiàn)一部分或全部的反峰。

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英文翻譯：

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Gas chromatograph out part of the reverse peak:refers to most of the peak is forward peak,but a part of the peak is reverse peak,or the baseline offset to the negative direction.

A.When using the air compressor,check whether the reverse peak output or negative baseline deviation is synchronized with the operation of the air compressor (automatic operation of the air compressor when the air pressure is insuffcient).

B.When more water enters the ionization detector,the combustion state of the flame will change for a shorttime,accompanide by an inverse peak (this is not abnormal).

C.Check whether the flow Settings of each gas are normal and wheter there is air leakage.

D.Check the purity of carrer gas,if there is trace impurity in carrier gas, and if the purity of the sample is higher than that of carrier gas ,there will be an inverse peak .

E.Pressure impact and reverse peak will occur when the gas path is switched.At this time,a pressure stabilizing device should be added to the gas path.

F.When using TCD,if the thermal conductivity coefficient of carrier gas and sample is too close,part or all of the inverse peak may occur.