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class="twoCol"><div id="3kxp3ap" class="page-proshow clearfix"><p class="current"> 當前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應</a>?<a href="http://www.cdcfah.com/cp/first-_yiqiyibiao/">儀器儀表</a>?<a href="http://www.cdcfah.com/cp/second-yiqiyibiao_sepuyi/">色譜儀</a>?<a href="http://www.cdcfah.com/cp/third-sepuyi_qxspy/">氣相色譜儀</a>?國產(chǎn)**氣相色譜儀經(jīng)銷商誠信互利上海儀電分析儀器供應</p><div id="shz222b" class="leftbox clearfix"><h1>國產(chǎn)**氣相色譜儀經(jīng)銷商誠信互利上海儀電分析儀器供應</h1><div id="sm8gwlc" class="proBig"><div id="zy9xpb2" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419906874638644/5480469.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="7jlsurd" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419906874638644/5480469.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="7wtvxjl" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關鍵詞：</span>國產(chǎn)**氣相色譜儀經(jīng)銷商,氣相色譜儀</p><p><span>***更新：</span>2021-01-24 03:12:10</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="laprykx" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海儀電分析儀器有限公司</a></p><p><span>聯(lián)系人：</span>薛馬駿</p><p><span>郵箱: </span>ydfxwx@qq.com</p><p><span>電話: </span>18001994173</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.inesa-a.com</p><p><span>手機: </span>021-34530361</p><p><span>地址: </span>徐塘路88號7幢4層、9幢</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="pdnk33b" class="page-proshow02"><p class="title">詳細說明</p><div id="ds2t39g" class="box"><p><p> 在GC中使用程序升溫時常常會出現(xiàn)基線漂移的現(xiàn)象，這種現(xiàn)象通常有以下幾個原因：色譜柱流失、進樣墊流失、進樣器污染或檢測器污染、氣體流速的變化。如果使用高靈敏度檢測器，即便是微弱的柱流失或系統(tǒng)污染都可能帶來明顯的基線漂移現(xiàn)象。為了提高定性和定量分析的可靠性，應盡可能的降低或消除基線漂移。 </p> <p> 確定基線漂移問題來源的方法如下： </p> <p> 首先把柱子從色譜儀上取下，堵住檢測器的入口，再觀察在程序升溫時基線的漂移情況。如果基線不穩(wěn)，那么污染來自檢測器（解決辦法請參考“如何降低檢測器的污染”）；如果基線是穩(wěn)定的，國產(chǎn)**氣相色譜儀經(jīng)銷商，證明檢測器良好，此時用一小段熔融石英管把進樣器和檢測器連接起來，走一個升溫程序，觀察基線漂移情況，此時反映的是進樣器的污染情況，國產(chǎn)**氣相色譜儀經(jīng)銷商，如果基線不穩(wěn)，可以確定問題來自進樣口（解決辦法請參考“如何降低進樣器的污染”）；如果基線穩(wěn)定，國產(chǎn)**氣相色譜儀經(jīng)銷商，證明檢測器和進樣口均未被污染，此時把柱子重新裝上，走同樣的升溫程序，來確定是不是柱子流失帶來的基線漂移。氣相色譜儀的有ECD和NPD等，LC有熒光和電化學檢測器。國產(chǎn)**氣相色譜儀經(jīng)銷商</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國產(chǎn)**氣相色譜儀經(jīng)銷商,氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419906874638644/5480469.png"></div><p> 如何使用氣相色譜儀時降低樣品和進樣器帶來的基線漂移？ </p> <p> 色譜柱上如果有高分子不揮發(fā)性物質(zhì)殘留，那么在程序升溫時就容易產(chǎn)生基線漂移，因為這些物質(zhì)的保留較強，在柱中移動緩慢，可以采用重新老化的方法將這種強保留組分從柱子上趕出，但這種方法增加了固定液氧化的可能性；此外，還可以使用溶劑沖洗色譜柱（沖洗之前請閱讀柱子的使用注意事項,以便選出合適的溶劑）；也可以安裝保護柱，這樣可以預防問題發(fā)生。如果是進樣器被污染造成基線漂移，可以通過更換進樣墊、襯管和密封圈來解決，同時用溶劑沖洗進樣口，維護完畢之后，用一段熔融石英管將進樣器和檢測器連接起來，進一針空樣，以確認進樣器已經(jīng)干凈。氮氣氣相色譜儀比較采用氣相色譜儀的PEG-20M毛細管柱，采用FID檢測器，完成對質(zhì)量食用酒精中甲醇、雜醇油等微量組分的檢測。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國產(chǎn)**氣相色譜儀經(jīng)銷商,氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419912011713691/7468815.png"></div><p> 氣相色譜儀的色譜柱被樣品或者雜質(zhì)污染： </p> <p> 即便是干凈的樣品也會含有痕量或微量的非揮發(fā)或半揮發(fā)性物質(zhì)。在反復的多次進樣后，無論是干凈的或是相對較臟的樣品都會有非揮發(fā)性的雜質(zhì)沉積在色譜柱的入口端內(nèi)表面。 </p> <p> 色譜柱的柱前幾米對于樣品是很重要的，在程序升溫的分析過程中，樣品譜帶首先堆積在這一段上，所以大部分的保留也是在這一段產(chǎn)生。 </p> <p> 柱內(nèi)污染物的存在會導致一系列的問題：峰型變差，柱效降低，前后兩次進樣的峰面積再現(xiàn)性差，這都是由于污染物的存在，使固定相對樣品的保留（吸附或吸收）不同所致。 </p><p> 氣相色譜儀中毛細管氣相色譜在技術上以“高效”而聞名，這意味著我們通常在色譜圖中看到非常窄的峰,這表明在合理的時間內(nèi)分離許多組分的能力，這顯然然在分析上是有利的。 </p> <p> 柱效通常以“塔板數(shù)”（每米列數(shù)的塔板數(shù)）來衡量，塔板數(shù)越高，色譜圖中的峰越窄。在某些應用中，如果柱效略有下降，但每個峰之間都有足夠的間距，也不會遭受分辨率損失。但是，當分離復雜的混合物時，如果峰略微變寬，則峰分離度就會下降，此時色譜效率變得尤為重要。 </p> <p> 圖1說明了這一點。氣相色譜儀的氣路閥件內(nèi)部松動、脫落或有污物，也常導致漏氣。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國產(chǎn)**氣相色譜儀經(jīng)銷商,氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419906438514229/1224225.png"></div><p style="text-indent:25px">任何氣相色譜儀的色譜系統(tǒng)中峰的正確“建?！睂⑷Q于跨峰捕獲的數(shù)據(jù)點的數(shù)量。對于高效技術（例如毛細管氣相色譜儀），必須特別注意檢測器的采樣頻率，而質(zhì)譜檢測器尤其如此，質(zhì)譜檢測器的固有采樣頻率往往較低，尤其是在全掃描模式下。如果檢測器*捕獲跨越峰的幾個數(shù)據(jù)點，尤其是當峰頂點被檢測器遺漏時，則它們看起來可能比其寬。請按照制造商的說明為使用中的檢測器找到比較好采樣頻率。無論如何，建議在新色譜柱保留常規(guī)方法的參考色譜圖，該色譜圖可用作評估柱效率隨時間下降的幅度的參考。使用系統(tǒng)適應性測試（SST），也是明智的選擇，以便在分析之前評估儀器的性能，并且柱效評估通常是SST的考察指標之一。盡管柱效是毛細管氣相色譜法成功分離的關鍵驅(qū)動力，但從以上討論中可以明顯看出，在解決低柱效問題時要考慮許多因素。大多數(shù)問題是由儀器設置和GC色譜柱的老化引起的，因此對方法中的設定點進行故障排除以及色譜柱與進樣口維護，是進行柱效診斷研究的考慮要點。氣相色譜儀的柱箱內(nèi)的梯度很小。對于一些成份復雜、沸程較寬的樣品，柱箱還可進行三階程序升溫控制。材料氣相色譜儀選擇</p><p style="text-indent:25px">對氣相色譜儀的色譜柱升至一恒定溫度，通常為其溫度上限。國產(chǎn)**氣相色譜儀經(jīng)銷商</p><p> 氣相色譜儀的色譜效率的測量；Wb=基線的峰寬；W1/2=半峰高處的峰寬 </p> <p> 峰越寬，色譜系統(tǒng)的N值越低。由分辨率的簡化定義公式，可以很好的理解柱效和分辨率之間的關系。 </p> <p> 正如我們所看到的，由理論塔板數(shù)“N”定義的柱效與分辨率直接相關，并且由于方程中的N項是平方根函數(shù)，我們可以假設將塔板數(shù)減半會減少任意兩個峰之間的分離度為1.4（例如2的平方根）。 </p> <p> 考慮到柱效對分離復雜混合物的重要性或當系統(tǒng)的選擇性限制了分離度時，非常值得花一些時間研究如何識別，判斷與解決氣相色譜系統(tǒng)中柱效問題。 </p> <p> “塔板”的概念來自分餾，而這一事實是，在蒸餾塔（塔）中擁有的“塔板”或陷阱越多，可從每個塔板（陷阱）中提取的沸程越窄，因此在餾分的窄沸程和窄色譜峰之間進行類比。色譜柱中板數(shù)越多，峰越窄，在氣相色譜中，一個塔板類似于分析物進入固定相的一次吸附和解吸事件。因此，對于具有100,000個板的色譜柱，分析物將吸附到固定相中，然后從固定相中解吸100,000次。表一描述了各種尺寸氣相色譜柱的典型塔板數(shù)。國產(chǎn)**氣相色譜儀經(jīng)銷商</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2982561.html</p></div></div></div></div></div><div id="akz23pb" class="page-right twoColRt"><div id="gvn2fwd" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="zognzgd" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強信息推薦自業(yè)物資供應</p></a></div><div id="y7qf74i" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/846569.html"><div><img 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