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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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(guān)鍵詞：</span>中端氣相色譜儀賣(mài)價(jià),氣相色譜儀</p><p><span>***更新：</span>2020-11-27 03:15:17</p><p><span id="click" >瀏覽次數(shù)：7次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="xavhtkb" 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(huà): </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(jī): </span>021-34530361</p><p><span>地址: </span>徐塘路88號(hào)7幢4層、9幢</p><p>[當(dāng)前離線(xiàn)] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="js8zdok" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="ikbmd7x" class="box"><p><p> 在新產(chǎn)品的研究開(kāi)發(fā)過(guò)程中，或在未知物的定性鑒定工作中，常需要收集色譜分離后的組分作進(jìn)一步分析，而某些高純度的生化試劑則是直接用色譜分離來(lái)制備的。就這一點(diǎn)而言，GC在原理上應(yīng)該是有優(yōu)勢(shì)的，因?yàn)槭占s分后載氣很容易除去。然而，由于氣相色譜儀的柱容量遠(yuǎn)不及LC，中端氣相色譜儀賣(mài)價(jià)，如果用氣相色譜儀作制備，那是相當(dāng)費(fèi)時(shí)的。因此，制備GC的實(shí)用價(jià)值很有限。制備LC則有范圍較廣的應(yīng)用。 </p> <p> 下面就來(lái)介紹一下，相比于氣相色譜，液相色譜在以下三大方面所具備的優(yōu)越性。 </p> <p> 氣相色譜不適用于不揮發(fā)物質(zhì)和對(duì)熱不穩(wěn)定物質(zhì)，中端氣相色譜儀賣(mài)價(jià)，而液相色譜卻不受樣品的揮發(fā)性和熱穩(wěn)定性的限制，中端氣相色譜儀賣(mài)價(jià)。有些樣品因?yàn)殡y以汽化而不能通過(guò)柱子，熱不穩(wěn)定的物質(zhì)受熱會(huì)發(fā)生分解，也不適用于氣相色譜法。這使氣相色譜法的使用范圍受到了限制。氣相色譜儀的初始階段基線(xiàn)應(yīng)持續(xù)上升，在到達(dá)老化溫度后5-10分鐘開(kāi)始下降，并且會(huì)持續(xù)30-90分鐘。中端氣相色譜儀賣(mài)價(jià)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中端氣相色譜儀賣(mài)價(jià),氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419906874638644/5480469.png"></div><p> 氣相色譜儀的熱傳導(dǎo)檢測(cè)器（TCD）的清洗 </p> <p> 將**，十氫萘等溶劑裝滿(mǎn)鑒定器的測(cè)量池，浸泡一段時(shí)間（20分鐘左右）后傾出，如此反復(fù)進(jìn)行多次至所傾出的溶液比較干凈為止。 </p> <p> 當(dāng)選用一種溶劑不能洗凈時(shí)，可根據(jù)沾污物的性質(zhì)先選用高沸點(diǎn)溶劑進(jìn)行浸泡清洗，然后再用低沸點(diǎn)溶劑反復(fù)清洗。洗凈后加熱趕去溶劑，再裝到儀器上，加熱鑒測(cè)器，通載氣沖洗數(shù)小時(shí)后即可使用。 </p> <p> 當(dāng)沾污不太嚴(yán)重時(shí)，可不必卸下清洗，此時(shí)只需要將色譜柱取下，用一根管子將進(jìn)樣口與鑒定器聯(lián)接起來(lái)，然后通載氣并將鑒測(cè)器爐溫升至120度以上，從進(jìn)樣口先注入20微升左右的蒸餾水，再用幾十微升**或氟里昂溶劑進(jìn)行清洗。可靠氣相色譜儀差價(jià)氣相色譜儀安裝及調(diào)試的基礎(chǔ)小知識(shí)，比如場(chǎng)地要求，氣源準(zhǔn)備，安裝時(shí)的注意事項(xiàng)等小知識(shí)點(diǎn)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中端氣相色譜儀賣(mài)價(jià),氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419906438514229/1224225.png"></div><p> 如何降低氣相色譜儀的檢測(cè)器帶來(lái)的基線(xiàn)漂移？ </p> <p> 由檢測(cè)器帶來(lái)的基線(xiàn)漂移通常是由補(bǔ)償氣或者燃?xì)猱?dāng)中少量的烴類(lèi)物質(zhì)引起的，使用高純氣體凈化器處理補(bǔ)償氣或者燃?xì)饪梢詼p少這種基線(xiàn)漂移；使用高純氣體發(fā)生器可以改善FID的基線(xiàn)穩(wěn)定性；正確的檢測(cè)器維護(hù)，包括定期的清洗，都可以減少這種漂移。 </p> <p> 如何降低柱子流失帶來(lái)的基線(xiàn)漂移？ </p> <p> 在使用新柱之前，按照以下方法老化可以使柱流失降到：用高于實(shí)驗(yàn)操作溫度20或者用色譜柱的操作溫度（使用兩者中較低者）來(lái)老化，長(zhǎng)時(shí)間低溫老化相對(duì)于短時(shí)間高溫老化有利于降低色譜柱流失。如果在載氣當(dāng)中含有少量的氧氣或者水分或者氣體管路漏氣，在高溫條件下，固定液就容易被氧化，從而造成柱流失，帶來(lái)基線(xiàn)漂移。一旦固定液被氧化，必須使用高純載氣老化數(shù)小時(shí)，才有可能使基線(xiàn)趨于水平，這種對(duì)固定液的破壞是無(wú)法彌補(bǔ)的，所以如果有氧氣連續(xù)通過(guò)色譜柱，即便進(jìn)行老化基線(xiàn)也無(wú)法降到水平。因此，在實(shí)驗(yàn)過(guò)程中，應(yīng)在氣體管路當(dāng)中使用高質(zhì)量的氧氣/水分過(guò)濾器，同時(shí)用高質(zhì)量的電子檢漏儀嚴(yán)格檢漏。 </p><p> 氣相色譜檢測(cè)器就像氣相的“眼睛”，是一種能檢測(cè)氣相色譜流出組分及其變化的器件。你知道氣相都有哪幾種檢測(cè)器嗎？每種檢測(cè)器在使用時(shí)要注意什么嗎？被測(cè)組分經(jīng)色譜柱分離后，是以氣態(tài)分子與載氣分子相混狀態(tài)從柱后流出的，人眼不可能識(shí)別。因此，必須要有一個(gè)裝置或方法，將混合氣體中組分的真實(shí)濃度（mg/mL）或質(zhì)量流量（g/s）變成可測(cè)量的電信號(hào)，且信號(hào)的大小與組分的量成正比。此裝置稱(chēng)氣相色譜檢測(cè)器，其方法稱(chēng)氣相色譜檢測(cè)法。因此，氣相色譜檢測(cè)器是一種能檢測(cè)氣相色譜流出組分及其變化的器件。 </p> <p> 檢測(cè)器通常由兩部分組成：傳感器和檢測(cè)電路。傳感器是利用被測(cè)物質(zhì)的各種物理性質(zhì)、化學(xué)性質(zhì)以及物理化學(xué)性質(zhì)與載氣的差異，來(lái)感應(yīng)出被測(cè)物質(zhì)的存在及其量的變化。如熱導(dǎo)檢測(cè)器（TCD）就是利用被測(cè)物質(zhì)的熱導(dǎo)系數(shù)和載氣熱導(dǎo)系數(shù)的差異；火焰電離檢測(cè)器（FID）、氮磷檢測(cè)器（NPD）等都是利用被測(cè)組分在一定條件下可被電離，而載氣不電離；火焰光度檢測(cè)器（FPD）就是利用被測(cè)物質(zhì)在一定條件下，可發(fā)射不同波長(zhǎng)的光，而載氣氮?dú)鈪s不發(fā)光等等。所以，傳感器是將被測(cè)物質(zhì)變換成相應(yīng)信號(hào)的裝置。它是檢測(cè)器的內(nèi)核。檢測(cè)器性能的好壞，主要取決于傳感器。采用氣相色譜儀的PEG-20M毛細(xì)管柱，采用FID檢測(cè)器，完成對(duì)質(zhì)量食用酒精中甲醇、雜醇油等微量組分的檢測(cè)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中端氣相色譜儀賣(mài)價(jià),氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419906791502804/6665363.png"></div><p> 氣相色譜儀的進(jìn)樣墊漏氣或者損壞原因及解決辦法： </p> <p> 隔墊的設(shè)計(jì)是為了在進(jìn)樣針穿刺后時(shí)、進(jìn)樣時(shí)及其拔出后，始終保持對(duì)系統(tǒng)的密封性。因此就需要采用能耐一定溫度和壓力的橡膠或塑化材料以保證這種良好的密封特性。 </p> <p> 但這種材質(zhì)的隔墊隨著時(shí)間的推移和一定的進(jìn)樣次數(shù)后，就會(huì)老化甚至漏氣，達(dá)不到進(jìn)樣密封的要求。 </p> <p> 有些情況下，當(dāng)氣相色譜儀進(jìn)樣墊老化損壞后，由于其密封性能下降，使載氣柱前壓無(wú)法達(dá)到設(shè)置要求，出現(xiàn)一系列問(wèn)題，有些較為先進(jìn)的儀器還會(huì)自動(dòng)關(guān)閉。 </p> <p> 進(jìn)樣墊漏氣會(huì)導(dǎo)致一些列問(wèn)題，這將導(dǎo)致一些典型的問(wèn)題比如定量重復(fù)性較差，分析樣品的保留時(shí)間變化（增長(zhǎng)）。所以進(jìn)樣墊應(yīng)該定期檢查及更換，有些色譜工作者會(huì)在每次進(jìn)行新的樣品分析前先更換一個(gè)新進(jìn)樣墊。氫焰離子化檢測(cè)器，配以熱解吸進(jìn)樣器、填充柱或毛細(xì)管柱的的氣相色譜儀。材料氣相色譜儀多少錢(qián)</p><p style="text-indent:25px">氣相色譜柱是氣相色譜儀的內(nèi)核部件之一。在氣相色譜分析時(shí)，色譜柱的選擇至關(guān)重要。中端氣相色譜儀賣(mài)價(jià)</p><p> 所以對(duì)于氣相色譜儀的水分相關(guān)進(jìn)樣，盡可能使用固定相極性強(qiáng)的（例如Wax柱），并要接受色譜柱壽命減少和柱流失增加的結(jié)果。 </p> <p> 色譜柱是否耐水，要仔細(xì)查看廠家說(shuō)明：比如標(biāo)明：不推薦使用水，或者標(biāo)明耐水等等。 </p> <p> 正確選擇點(diǎn)火所需氣體流量比例 </p> <p> 請(qǐng)注意點(diǎn)火期間關(guān)閉尾吹氣。 </p> <p> 氫氣與空氣之間流量的比例按照廠商建議，或者使用1：10的常規(guī)比例，如30ml/min的氫氣流量加300ml/min的空氣流量。 </p> <p> 請(qǐng)?zhí)貏e注意，設(shè)定之后如有條件比較好用流量計(jì)測(cè)量一下設(shè)定流量。中端氣相色譜儀賣(mài)價(jià)</p><p style="text-indent:25px">上海儀電分析儀器有限公司總部位于徐塘路88號(hào)7幢4層、9幢，是一家儀器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷(xiāo)售，計(jì)算機(jī)軟件開(kāi)發(fā)及銷(xiāo)售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)?！疽婪毥?jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】?jī)x器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷(xiāo)售，計(jì)算機(jī)軟件開(kāi)發(fā)及銷(xiāo)售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)?！疽婪毥?jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】的公司。儀電分析擁有一支經(jīng)驗(yàn)豐富、技術(shù)創(chuàng)新的專(zhuān)業(yè)研發(fā)團(tuán)隊(duì)，以高度的專(zhuān)注和執(zhí)著為客戶(hù)提供分光光度計(jì)，氣相色譜，原子吸收，食品安全。儀電分析致力于把技術(shù)上的創(chuàng)新展現(xiàn)成對(duì)用戶(hù)產(chǎn)品上的貼心，為用戶(hù)帶來(lái)良好體驗(yàn)。儀電分析創(chuàng)始人湯志東，始終關(guān)注客戶(hù)，創(chuàng)新科技，竭誠(chéng)為客戶(hù)提供良好的服務(wù)。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2159586.html</p></div></div></div></div></div><div id="7kwn3nj" class="page-right twoColRt"><div id="fduq7uv" class="box01 margin10 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