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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="yu233dk" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419907523278018/8740364.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="3agikho" 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>環(huán)境檢測氣相色譜儀差價(jià),氣相色譜儀</p><p><span>***更新：</span>2021-01-24 02:11:12</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="k7urdfr" 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(jī): </span>021-34530361</p><p><span>地址: </span>徐塘路88號7幢4層、9幢</p><p>[當(dāng)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="okz8ysp" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="fe23oqi" class="box"><p><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，使載氣柱前壓無法達(dá)到設(shè)置要求，出現(xiàn)一系列問題，有些較為先進(jìn)的儀器還會自動關(guān)閉。 </p> <p> 進(jìn)樣墊漏氣會導(dǎo)致一些列問題，這將導(dǎo)致一些典型的問題比如定量重復(fù)性較差，環(huán)境檢測氣相色譜儀差價(jià)，分析樣品的保留時(shí)間變化（增長）。所以進(jìn)樣墊應(yīng)該定期檢查及更換，有些色譜工作者會在每次進(jìn)行新的樣品分析前先更換一個新進(jìn)樣墊，環(huán)境檢測氣相色譜儀差價(jià)。氣相色譜儀的柱箱內(nèi)的梯度很小，環(huán)境檢測氣相色譜儀差價(jià)。對于一些成份復(fù)雜、沸程較寬的樣品，柱箱還可進(jìn)行三階程序升溫控制。環(huán)境檢測氣相色譜儀差價(jià)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="環(huán)境檢測氣相色譜儀差價(jià),氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419907523278018/8740364.png"></div><p> 操作條件對于色譜分離有很大影響。 </p> <p> １、柱長，柱內(nèi)徑：一般講，柱管增長，可改善分離能力，短則組分餾出的快些；柱內(nèi)徑小分離效果好，柱內(nèi)徑大處理量大，但柱內(nèi)徑過大，將導(dǎo)致?lián)w不能均勻地分布在色譜柱中。分析用柱管一般內(nèi)徑為３－６毫米，柱長為１－４米。 </p> <p> ２、柱溫：是一個重要的操作變數(shù)，直接影響分離效能和分析速度。選擇柱溫的根據(jù)是混合物的沸點(diǎn)范圍，固定液的配比和鑒定器的靈敏度。提高柱溫可縮短分析時(shí)間；降低柱溫可使色譜柱選擇性增大，有利于組分的分離和色譜柱穩(wěn)定性提高，柱壽命延長。一般采用等于或高于數(shù)十度于樣品的平均沸點(diǎn)的柱溫為較合適，對易揮發(fā)樣用低柱溫，不易揮發(fā)的樣品采用高柱溫。 </p> <p> ３、載氣流速：載氣流速是決定色譜分離的重要原因之一。一般講流速高色譜峰狹，反之則寬些，但流速過高或過低對分離都有不利的影響。流速要求要平穩(wěn)，常用的流速范圍每分鐘在１０－１００亳升之間。低端氣相色譜儀代***相色譜儀采用微機(jī)對進(jìn)樣器進(jìn)行溫度控制。根據(jù)不同種類的色譜柱及不同的進(jìn)樣方式，有五種進(jìn)樣器可供選擇。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="環(huán)境檢測氣相色譜儀差價(jià),氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419908679508676/5259694.png"></div><p> 氣相色譜儀的熱傳導(dǎo)檢測器（TCD）的清洗 </p> <p> 將**，十氫萘等溶劑裝滿鑒定器的測量池，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，然后通載氣并將鑒測器爐溫升至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。 </p><p> 排除氣相色譜儀的注射器里所有的空氣 </p> <p> 用微量注射器抽取液體樣品時(shí)，只要重復(fù)地把液體抽凡注射器又迅速把其排回樣品瓶，就可做到遺一點(diǎn)。 </p> <p> 還有一種更好的方法，可以排除注射器里所有的空氣那就是用計(jì)劃注射量的約2倍的樣品置換注射器3～5次。每扶取到樣品后，垂直拿起注射器，針尖朝上任何依然留在注射器里的空氣都應(yīng)當(dāng)跑到針管頂部推進(jìn)注射器塞子，空氣就會被排掉。 </p> <p> 保證進(jìn)樣量的準(zhǔn)確 </p> <p> 用經(jīng)畿換過的注射器取約計(jì)劃進(jìn)樣量2倍左右的樣品，垂直拿起注射器，針尖朝上，讓針穿過一層紗布，這樣可用紗布吸收從針尖排出的液體推進(jìn)注射器塞子。直到讀出所需要的數(shù)值用紗布擦干針尖，至此準(zhǔn)確的液體體積已經(jīng)測得。需要再抽若干空氣到注射器里，如果不慎推動柱塞，空氣可以保護(hù)液體使之不被排走。根據(jù)實(shí)驗(yàn)要求把氣相色譜儀的柱箱、氣化室、檢測器的溫度升到工作溫度至穩(wěn)定。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="環(huán)境檢測氣相色譜儀差價(jià),氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419913150082813/7656679.png"></div>氣相色譜儀的色譜柱固定相流失嚴(yán)重以致無法達(dá)到所需的柱效或分離度： <p> 隨著時(shí)間的推移，固定相隨自然流失過程從色譜柱損失。流失速率取決于對色譜柱的保護(hù)和膜厚度以及固定相的極性。 </p> <p> 在某種程度上，即使是系統(tǒng)定義的適用性或正在運(yùn)行一般需求的分析，色譜柱仍然無法達(dá)到分析要求。需要對色譜柱進(jìn)行老化處理的癥狀包括峰形變差和柱效降低(峰加寬)。 </p> <p> 大多數(shù)情況下，柱效能可以通過割掉柱前約0.5-1米長的色譜柱來進(jìn)行修復(fù)，這樣做可以有效地去掉由于熱降解反應(yīng)損壞的色譜柱部分。如果反復(fù)裁剪(×3)色譜柱仍無效果，有可能顛倒柱前柱后可能會有類似的恢復(fù)效果。如果以上措施都不能修復(fù)，則需要更換色譜柱。 </p> <p> 在某些情況下，在柱前接一個保護(hù)柱(0.5-5米長未涂層的石英毛細(xì)管)，可以用來延長分析柱的使用壽命。氣相色譜儀的基線正弦波波動，可能是載氣流量不穩(wěn)定，除檢查氣源外，也要排除是否漏氣。國內(nèi)**氣相色譜儀報(bào)價(jià)</p><p style="text-indent:25px">采用帶氫焰離子化檢測器的氣相色譜儀，使用**NP+7%吐溫-80，或大口徑￠0.53mm**毛細(xì)管柱。環(huán)境檢測氣相色譜儀差價(jià)</p><p> 而在LC中尚無通用性這么好的高靈敏度檢測器。商品LC儀器常配的也就是紫外-可見光吸收檢測器(UV-Vis)和示差折光檢測器(RI)。前者的通用性遠(yuǎn)不及GC中的FID，后者的靈敏度又較低，且不適于梯度洗脫。當(dāng)然，不論GC還是LC，都有一些高靈敏度的選擇性檢測器，GC有ECD和NPD等，LC有熒光和電化學(xué)檢測器。較為理想的檢測器應(yīng)該首推MS，但在這一點(diǎn)上，GC目前要優(yōu)于LC。 </p> <p> 因?yàn)镚C流動相的特點(diǎn)，它與MS的在線聯(lián)用已不存在任何問題，特別是毛細(xì)管GC與MS的聯(lián)用已成為常規(guī)分析方法。而LC與MS的聯(lián)用就受到了流動相的限制。雖然目前已有多種接口，如離子束、熱噴霧、電噴霧等，但流動相的選擇還是受到明顯的限制。環(huán)境檢測氣相色譜儀差價(jià)</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2981082.html</p></div></div></div></div></div><div id="scmlnur" class="page-right twoColRt"><div id="ujv2hj3" class="box01 margin10 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