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id="zip8okr" class="twoCol"><div id="n3mta3g" class="page-proshow clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</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>?學(xué)校氣相色譜儀廠家歡迎來電上海儀電分析儀器供應(yīng)</p><div id="veqfhgg" class="leftbox clearfix"><h1>學(xué)校氣相色譜儀廠家歡迎來電上海儀電分析儀器供應(yīng)</h1><div id="ih3gq8s" class="proBig"><div id="lzbow43" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419913150082813/7656679.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="jip7ofm" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419913150082813/7656679.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="f8fh7d3" 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(guān)鍵詞：</span>學(xué)校氣相色譜儀廠家,氣相色譜儀</p><p><span>***更新：</span>2020-11-28 03:15:31</p><p><span id="click" >瀏覽次數(shù)：8次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="rugfes3" 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(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="p2olxwv" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="d3n78sm" class="box"><p><p> 在定量分析中,應(yīng)注意進(jìn)樣量讀數(shù)準(zhǔn)確在氣相色譜分析中，一般是采用注射器或六通閥門進(jìn)樣在考慮進(jìn)樣技術(shù)的時候，主要是以注射器進(jìn)樣為對象。 </p> <p> 進(jìn)樣量 </p> <p> 進(jìn)樣量與氣化溫度、柱容量和儀器的線性響應(yīng)范圍等因素有關(guān)，也即進(jìn)樣量應(yīng)控制在能瞬間氣化。達(dá)到規(guī)定分離要求和線性響應(yīng)的允許范圍之內(nèi)，填充柱沖洗法的瞬間進(jìn)樣量：液體樣品或固體樣品溶液一般為0.01～10微升,氣體樣品一般為0.1～10毫升。 </p> <p> 排除注射器里所有的空氣 </p> <p> 用微量注射器抽取液體樣品時，只要重復(fù)地把液體抽凡注射器又迅速把其排回樣品瓶，學(xué)校氣相色譜儀廠家，學(xué)校氣相色譜儀廠家，就可做到遺一點。 </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，學(xué)校氣相色譜儀廠家。頂空氣相色譜法對浸出油中6號溶劑殘留量進(jìn)行測定。采用氫焰離子化檢測器的氣相色譜儀。學(xué)校氣相色譜儀廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="學(xué)校氣相色譜儀廠家,氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419913150082813/7656679.png"></div><p> 氣相色譜儀的幾種檢測器 </p> <p> 氫火焰離子化檢測器(FID)用于微量有機物分析； </p> <p> 熱導(dǎo)檢測器(TCD)用于常量、半微量分析，有機、無機物均有響應(yīng)； </p> <p> 電子捕獲檢測器(ECD)用于有機氯農(nóng)藥殘留分析； </p> <p> 火焰光度檢測器(FPD)用于有機磷、硫化物的微量分析； </p> <p> 氮磷檢測器(NPD)用于有機磷、含氮化合物的微量分析； </p> <p> 催化燃燒檢測器(CCD)用于對可燃性氣體及化合物的微量分析； </p> <p> 光離子化檢測器(PID)用于對有毒有害物質(zhì)的痕量分析色譜檢測器分類； </p> <p> 按原理可分為光學(xué)檢測器(如，紫外、熒光、示差折光、蒸發(fā)光散射)、熱學(xué)檢測器(如，吸附熱)、電化學(xué)檢測器(如，極譜、庫侖、安培)、電學(xué)檢測器(電導(dǎo)、介電常數(shù)、壓電石英頻率)、放射性檢測器(閃爍計數(shù)、電子捕獲、氦離子化)以及氫火焰離子化檢測器。氮氣氣相色譜儀銷售廠家選用TCD、FID，配以**色譜柱的氣相色譜儀，可完成對煙氣總粒相物中水份及尼古丁含量的檢測。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="學(xué)校氣相色譜儀廠家,氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419912011713691/7468815.png"></div><p> 氣相色譜儀按測量性質(zhì)可分為通用型和專屬型(又稱選擇性)。通用型檢測器測量的是一般物質(zhì)均具有的性質(zhì)，它對溶劑和溶質(zhì)組分均有反應(yīng)，如示差折光、蒸發(fā)光散射檢測器。通用型的靈敏度一般比專屬型的低。專屬型檢測器只能檢測某些組分的某一性質(zhì)，如紫外、熒光檢測器，它們只對有紫外吸收或熒光發(fā)射的組分有響應(yīng)。 </p> <p> 按檢測方式分為濃度型和質(zhì)量型。濃度型檢測器的響應(yīng)與流動相中組分的濃度有關(guān)，質(zhì)量型檢測器的響應(yīng)與單位時間內(nèi)通過檢測器的組分的量有關(guān)。 </p> <p> 檢測器還可分為破壞樣品和不破壞樣品的兩種。 </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(jìn)樣墊流失、進(jìn)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(yīng)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，證明檢測器良好，此時用一小段熔融石英管把進(jìn)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(jìn)樣器的污染情況，如果基線不穩(wěn)，可以確定問題來自進(jìn)樣口（解決辦法請參考“如何降低進(jìn)樣器的污染”）；如果基線穩(wěn)定，證明檢測器和進(jìn)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。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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="學(xué)校氣相色譜儀廠家,氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419908679508676/5259694.png"></div><p> 氫焰氣相色譜儀開機時需要點火，有時因各種原因致使熄火后，也需要點火。然而，我們經(jīng)常會遇到點火不著的情況，下面介紹兩種點火技巧，供同行們相試。 </p> <p> 1加大氫氣流量法 </p> <p> 先加大氫氣流量，點著火后，再緩慢調(diào)回工作狀況此法通用。 </p> <p> 2減少尾吹氣流量法 </p> <p> 先減少尾吹氣流量，點著火后，再調(diào)回工作狀況此法適用于用氫氣怍載氣，用空氣作助燃?xì)夂臀差睔馇闆r。 </p> <p> 4氣比的調(diào)節(jié)氫焰氣相色譜儀三氣的流量比．有關(guān)資料均建議為：氮氣：氫氣：空氣=l：l：10但由于轉(zhuǎn)子流量計指示流量的不準(zhǔn)確性．事實上誰會去苛求這個配比呢?本人認(rèn)為為各氣旌以良好匹配。目的是既有高的檢測器靈敏度又能有較好的分離效果。還不致于容易熄火。本著上述原則氣比應(yīng)按下法調(diào)節(jié)：氣相色譜儀的輔助氣漏氣時，一般表現(xiàn)為色譜峰響應(yīng)降低甚至沒有響應(yīng)等。低端氣相色譜儀比較</p><p style="text-indent:25px">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。學(xué)校氣相色譜儀廠家</p><p> 氣相色譜儀的色譜柱污染和老化： </p> <p> 所有GC色譜柱都會老化，并且使用壽命有限。隨著時間的流逝，色譜柱的入口端可能會被樣品基質(zhì)成分覆蓋，固定相可能會被破壞，這通常會導(dǎo)致固定相在色譜柱下方“蠕變”，從而形成一個較厚的“氣泡狀”可降分離效率的固定相區(qū)域。樣品遇到的色譜柱初始區(qū)域?qū)τ谏V質(zhì)量至關(guān)重要，因此，我們必須確保該區(qū)域的相質(zhì)量是原始的。通常，通過修整較短的色譜柱并重新安裝可以解決此問題，并且可能需要一部分或更多的色譜柱修整才能恢復(fù)性能。始終修剪少的量以恢復(fù)良好的性能，如果進(jìn)行了重大修剪，請不要忘記調(diào)整儀器內(nèi)的色譜柱長度，以確保保留時間重現(xiàn)性和正確的載氣線速度。在載氣供應(yīng)管線中安裝氣阱總是一個很好的解決辦法，以確保色譜柱（相）的壽命（小的水分和氧氣阱），并確保以正確的方式調(diào)節(jié)色譜柱。適當(dāng)?shù)臉悠奉A(yù)處理對于色譜柱的使用壽命也很重要，在分析之前制備清潔的樣品，會延長色譜柱的使用壽命，減少進(jìn)樣口維護操作。學(xué)校氣相色譜儀廠家</p><p style="text-indent:25px">上海儀電分析儀器有限公司致力于儀器儀表，是一家生產(chǎn)型的公司。公司業(yè)務(wù)分為分光光度計，氣相色譜，原子吸收，食品安全等，目前不斷進(jìn)行創(chuàng)新和服務(wù)改進(jìn)，為客戶提供良好的產(chǎn)品和服務(wù)。公司注重以質(zhì)量為中心，以服務(wù)為理念，秉持誠信為本的理念，打造儀器儀表良好品牌。儀電分析憑借創(chuàng)新的產(chǎn)品、專業(yè)的服務(wù)、眾多的成功案例積累起來的聲譽和口碑，讓企業(yè)發(fā)展再上新高。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2173442.html</p></div></div></div></div></div><div id="m2mwnjw" class="page-right twoColRt"><div id="332npqx" class="box01 margin10 clearfix"><h3><a 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