氣相色譜儀比較推薦咨詢上海儀電分析儀器供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺(tái)【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="氣相色譜法有哪些特點(diǎn)？答：氣相色譜是色譜中的一種，就是用氣體做為流動(dòng)相的色譜法，在分離分析方面，具有如下一些特點(diǎn)：１、高靈敏度：可檢出１０-１3克的物質(zhì)，可作超純氣體、高分子單體的痕跡量雜質(zhì)分析和空氣中微量毒物的分析。２、高選擇性：可有效地"><meta name="keywords" content="氣相色譜儀比較,氣相色譜儀"><link rel="canonical" href="http://www.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> <meta name="baidu-site-verification" content="OBVzrC9aaQ" /> <meta http-equiv="Cache-Control" content="no-transform" /> <meta 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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>?氣相色譜儀比較推薦咨詢上海儀電分析儀器供應(yīng)</p><div id="0lstkw3" class="leftbox clearfix"><h1>氣相色譜儀比較推薦咨詢上海儀電分析儀器供應(yīng)</h1><div id="troa2sz" class="proBig"><div id="xg3v98g" 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="vevc2e8" 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="velsmyp" 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>氣相色譜儀比較,氣相色譜儀</p><p><span>***更新：</span>2020-11-30 04:15:51</p><p><span id="click" >瀏覽次數(shù)：5次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="uvcjawd" 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(hào)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="uyvcjvm" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="wubi2f4" class="box"><p><p> 氣相色譜法有哪些特點(diǎn)？ </p> <p> 答：氣相色譜是色譜中的一種，就是用氣體做為流動(dòng)相的色譜法，在分離分析方面，具有如下一些特點(diǎn)： </p> <p> １、高靈敏度：可檢出１０-１3克的物質(zhì)，可作超純氣體、高分子單體的痕跡量雜質(zhì)分析和空氣中微量毒物的分析。 </p> <p> ２、高選擇性：可有效地分離性質(zhì)極為相近的各種同分異構(gòu)體和各種同位素。 </p> <p> ３、高效能：可把組分復(fù)雜的樣品分離成單組分。 </p> <p> ４、速度快：一般分析、只需幾分鐘即可完成，有利于指導(dǎo)和控制生產(chǎn)。 </p> <p> ５、應(yīng)用范圍廣：即可分析低含量的氣、液體，亦可分析高含量的氣、液體，可不受組分含量的限制。 </p> <p> ６、所需試樣量少：一般氣體樣用幾毫升，氣相色譜儀比較，液體樣用幾微升或幾十微升。 </p> <p> ７、設(shè)備和操作比較簡(jiǎn)單儀器價(jià)格便宜，氣相色譜儀比較。氣相色譜儀的氣路閥件內(nèi)部松動(dòng)，氣相色譜儀比較、脫落或有污物，也常導(dǎo)致漏氣。氣相色譜儀比較</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="氣相色譜儀比較,氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419906874638644/5480469.png"></div><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(mén)進(jìn)樣在考慮進(jìn)樣技術(shù)的時(shí)候，主要是以注射器進(jìn)樣為對(duì)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(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(huì)被排掉。可靠氣相色譜儀怎么樣氣相色譜儀應(yīng)用范圍很廣，在石油、化工、生物化學(xué)、環(huán)保等領(lǐng)域都有應(yīng)用。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="氣相色譜儀比較,氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419911168962590/9491652.png"></div>氣相色譜儀的色譜柱固定相流失嚴(yán)重以致無(wú)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(guò)程從色譜柱損失。流失速率取決于對(duì)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(wú)法達(dá)到分析要求。需要對(duì)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(guò)割掉柱前約0.5-1米長(zhǎng)的色譜柱來(lái)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(wú)效果，有可能顛倒柱前柱后可能會(huì)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(gè)保護(hù)柱(0.5-5米長(zhǎng)未涂層的石英毛細(xì)管)，可以用來(lái)延長(zhǎng)分析柱的使用壽命。 </p><p> 氣相色譜儀的尾吹氣流量多少合適呢？這要看所用檢測(cè)器和色譜柱的尺寸而定。比如，用0.53mm大口徑柱時(shí)，柱內(nèi)流量可達(dá)15mL/min，這對(duì)微型TCD和單絲TCD來(lái)說(shuō)已經(jīng)夠大了，就沒(méi)必要再加尾吹氣了。而對(duì)于FID、NPD、FPD則需要至少10mL/min的尾吹氣流量，對(duì)于ECD就需要20mL/min的尾吹氣（ECD一般需要載氣總流量大于25mL/min）。使用常規(guī)或微徑柱時(shí)，尾吹氣流量應(yīng)相應(yīng)增大。經(jīng)驗(yàn)參考值為：FID、NPD、FPD需要柱內(nèi)載氣和尾吹氣的流量之和為30mL/min左右。ECD則需要40~60mL/min。當(dāng)需要在比較高靈敏度狀態(tài)下工作時(shí)，應(yīng)針對(duì)具體樣品優(yōu)化尾吹氣流量以及其他氣體流量。一般情況下，尾吹氣所用氣體類型應(yīng)與載氣相同。 </p> <p> 尾吹氣流量是在安裝好色譜柱后，在檢測(cè)器出口處用皂膜流量計(jì)測(cè)定的。注意，測(cè)定尾吹氣流量時(shí)要關(guān)閉其他氣體（如，使用FID時(shí)要關(guān)閉空氣和氫氣），用0.32mm以下內(nèi)徑的色譜柱時(shí)，可不關(guān)閉柱內(nèi)載氣，這時(shí)測(cè)得的流量為柱內(nèi)載氣和尾吹氣流量之和。氣相色譜儀的恒溫操作時(shí)基線無(wú)規(guī)則波動(dòng)或向一個(gè)方向漂移，出現(xiàn)這些現(xiàn)象可先排除載氣是否漏氣。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="氣相色譜儀比較,氣相色譜儀" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419913150082813/7656679.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。在氣相色譜儀的空白試驗(yàn)的色譜圖中，不應(yīng)該有色譜峰出現(xiàn)。工業(yè)氣相色譜儀賣價(jià)</p><p style="text-indent:25px">對(duì)氣相色譜儀的色譜柱升至一恒定溫度，通常為其溫度上限。氣相色譜儀比較</p><p> 半揮發(fā)性的雜質(zhì)也會(huì)導(dǎo)致峰型變差，因?yàn)樗麄儠?huì)聚集在柱頭，干擾流動(dòng)相和固定相之間的正常分配和樣品譜帶的結(jié)構(gòu)。 </p> <p> 用一個(gè)氣相色譜儀的色譜柱測(cè)試液（醇類混合溶液）可以更深入的研究半揮發(fā)性雜質(zhì)存在的影響。如果柱內(nèi)吸附有半揮發(fā)性雜質(zhì)或存在活性部位，醇類會(huì)有明顯的拖尾，而且保留時(shí)間長(zhǎng)的醇（較后流出、揮發(fā)性較低）的拖尾現(xiàn)象更加嚴(yán)重。但若經(jīng)測(cè)試，醇類沒(méi)有拖尾現(xiàn)象，則可認(rèn)為色譜柱還未被污染。 </p> <p> 即便在樣品提取和準(zhǔn)備時(shí)很仔細(xì)小心，但處理后的樣品中仍會(huì)含有半揮發(fā)性或不揮發(fā)的雜質(zhì)，即便其含量很小。但好的樣品前處理方式和使用清潔的容器還是能減少進(jìn)樣帶入系統(tǒng)的污染物。 </p> <p> 可使用預(yù)柱來(lái)保護(hù)色譜柱，或在色譜柱前接一段1至5米長(zhǎng)的未涂敷硅土柱，用以捕獲那些半揮發(fā)性及非揮發(fā)性的雜質(zhì)。 </p> <p> 將色譜柱的進(jìn)樣端截去0.5至1米，通常也會(huì)解決或者部分的解決這個(gè)問(wèn)題。氣相色譜儀比較</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。公司自成立以來(lái)，以質(zhì)量為發(fā)展，讓匠心彌散在每個(gè)細(xì)節(jié)，公司旗下分光光度計(jì)，氣相色譜，原子吸收，食品安全深受客戶的喜愛(ài)。公司注重以質(zhì)量為中心，以服務(wù)為理念，秉持誠(chéng)信為本的理念，打造儀器儀表良好品牌。儀電分析秉承“客戶為尊、服務(wù)為榮、創(chuàng)意為先、技術(shù)為實(shí)”的經(jīng)營(yíng)理念，全力打造公司的重點(diǎn)競(jìng)爭(zhēng)力。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2202116.html</p></div></div></div></div></div><div id="npw8pw2" class="page-right twoColRt"><div id="az3ysdu" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="q3elszq" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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