雙光束紫外可見分光光度計(jì)排名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="紫外可見分光光度計(jì)之比色皿的選擇與使用小技巧一直以來都認(rèn)為比色皿洗滌不干凈會(huì)造成很大實(shí)驗(yàn)誤差，才發(fā)現(xiàn)原來比色皿選擇不當(dāng)也能造成不可預(yù)測(cè)的誤差。在此，就小結(jié)下有關(guān)如何正確選擇比色皿、比色皿使用注意事項(xiàng)以及比色皿的洗滌方法。比色皿透光面是由能夠"><meta name="keywords" content="雙光束紫外可見分光光度計(jì)排名,紫外可見分光光度計(jì)"><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 http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head><body> <h1><a href="http://www.cdcfah.com/">六月丁香婷婷亚洲中文字幕,欧美精品高清一区二区蜜芽,尤物92午夜福利视频,精品视频一区二区三区在线观看</a></h1> <div style="position:fixed;left:-9000px;top:-9000px;"><object id="qgqbi"></object><delect id="qgqbi"><sub id="qgqbi"><dl id="qgqbi"></dl></sub></delect><track id="qgqbi"></track><tr id="qgqbi"></tr><video id="qgqbi"></video><xmp id="qgqbi"><span id="qgqbi"></span></xmp><span id="qgqbi"></span><strong id="qgqbi"><em id="qgqbi"><sup id="qgqbi"><progress id="qgqbi"></progress></sup></em></strong><dl id="qgqbi"><small id="qgqbi"></small></dl><wbr id="qgqbi"></wbr><noscript id="qgqbi"></noscript><tr id="qgqbi"></tr><track id="qgqbi"><dl id="qgqbi"></dl></track><label id="qgqbi"><em id="qgqbi"></em></label><tbody id="qgqbi"></tbody><blockquote id="qgqbi"></blockquote><dfn id="qgqbi"><center 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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>雙光束紫外可見分光光度計(jì)排名,紫外可見分光光度計(jì)</p><p><span>***更新：</span>2020-11-17 03:17:15</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="dbo8cmi" 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="d8gtsug" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="edfegsz" class="box"><p><p> 紫外可見分光光度計(jì)之比色皿的選擇與使用小技巧 </p> <p> 一直以來都認(rèn)為比色皿洗滌不干凈會(huì)造成很大實(shí)驗(yàn)誤差，才發(fā)現(xiàn)原來比色皿選擇不當(dāng)也能造成不可預(yù)測(cè)的誤差。在此，就小結(jié)下有關(guān)如何正確選擇比色皿、比色皿使用注意事項(xiàng)以及比色皿的洗滌方法。 </p> <p> 比色皿透光面是由能夠透過所使用的波長(zhǎng)范圍的光的材料制成。在200-350nm工作的比色皿適用于紫外區(qū),必須使用石英或熔熔硅石制成透光面的石英比色皿。(注：熔熔硅石的還真沒見過，雙光束紫外可見分光光度計(jì)排名，只用過石英的)石英比色皿既可用于紫外區(qū)又可用于可見區(qū)，但是價(jià)格一般比較貴，所以要根據(jù)使用波長(zhǎng)選擇比色皿，如果不用紫外區(qū)的話，用普通玻璃比色皿就行了，一則浪費(fèi)沒必要，二則，嘿嘿，摔碎了也不心疼，雙光束紫外可見分光光度計(jì)排名，哈哈。而普通硅酸鹽光學(xué)玻璃制成的透光面的比色皿,只能用于350nm至1000nm的可見區(qū)。分光光度法可以得出一些化學(xué)反應(yīng)速度常數(shù)，雙光束紫外可見分光光度計(jì)排名，并從兩個(gè)或兩個(gè)以上溫度條件下得到的速度數(shù)據(jù)，得出反應(yīng)活化能。雙光束紫外可見分光光度計(jì)排名</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="雙光束紫外可見分光光度計(jì)排名,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png"></div><p> 可見分光光度計(jì)，紫外分光光度計(jì)和紫外可見分光光度計(jì)有什么區(qū)別? </p> <p> 可見分光光度計(jì)和紫外分光光度計(jì)的區(qū)別是測(cè)定波長(zhǎng)范圍不同，一般可見光波長(zhǎng)范圍是400～1000nm,紫外光波長(zhǎng)范圍是200～400nm。所謂紫外可見分光光度計(jì)也就是說這個(gè)儀器可以通過更換光源形成紫外和可見的光區(qū)，能夠測(cè)定吸收峰在紫外和可見光部分的化合物。一般測(cè)定波長(zhǎng)在200～1000nm。 </p> <p> 分光光度計(jì)的關(guān)鍵參數(shù)有哪些? </p> <p> 選擇可見和紫外可見的分光光度計(jì)所關(guān)注的關(guān)鍵的指標(biāo)有三點(diǎn)：一是波長(zhǎng)范圍，二是波長(zhǎng)準(zhǔn)確度，三是雜散光參數(shù)。波長(zhǎng)范圍的選擇是由用戶實(shí)驗(yàn)需要所定，波長(zhǎng)范圍越寬的價(jià)格越貴;波長(zhǎng)準(zhǔn)確度及雜散光參數(shù)的數(shù)值越低，表示性能越好。教學(xué)紫外可見分光光度計(jì)對(duì)比紫外可見分光光度計(jì)在開機(jī)前將樣品室內(nèi)的干燥劑取出，儀器自檢過程中禁止打開樣品室蓋。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="雙光束紫外可見分光光度計(jì)排名,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png"></div><p> 掌握紫外可見光分光光度計(jì)基本工作原理：一定頻率紫外可見光照射所需要分析的目標(biāo)樣品，引起目標(biāo)樣品中價(jià)電子發(fā)生躍遷，從而變現(xiàn)隨著吸收波長(zhǎng)變化而引起光譜變化，形成可供分析數(shù)據(jù)。 </p> <p> 以朗伯-比耳定律(Lambert-beer)為理論基礎(chǔ)，特定波長(zhǎng)吸收中，吸收程度正比于試樣成分濃度，因此，可進(jìn)行光譜的定性分析。且根據(jù)吸收與已知濃度標(biāo)樣比較，能進(jìn)行定量分析。 </p> <p> 紫外可見光分光光度計(jì)種類及優(yōu)缺點(diǎn)對(duì)比：傳統(tǒng)機(jī)型：?jiǎn)喂馐鳸V、全程密閉、以光柵進(jìn)行分光，標(biāo)樣和測(cè)試樣品分別測(cè)試，全波段掃描時(shí)間至多2min；比例雙光束UV：?jiǎn)喂馐鳸V，全程密閉、經(jīng)光柵再經(jīng)棱鏡，全程密閉、標(biāo)樣和測(cè)試樣品分別測(cè)試、測(cè)試靈敏度降低，全波段分析時(shí)間長(zhǎng)。 </p><p> 分光光度計(jì)作為一種精密儀器，在運(yùn)行工作過程中由于工作環(huán)境、操作方法等種種原因，其技術(shù)狀況必然會(huì)發(fā)生某些變化，可能影響設(shè)備的性能，甚至誘發(fā)設(shè)備故障及事故。因此，分析工作者必須了解分光光度計(jì)的基本原理和使用說明，并能及時(shí)發(fā)現(xiàn)和排除這些隱患，對(duì)已產(chǎn)生的故障及時(shí)維修才能保證儀器設(shè)備的正常運(yùn)行。 </p> <p> 紫外可見分光光度計(jì)--使用經(jīng)驗(yàn) </p> <p> 若大幅度改變測(cè)試波長(zhǎng)，需稍等片刻，等燈熱平衡后，重新校正“0”和“100%”然后再測(cè)量。 </p> <p> 指針式儀器在未接通電源時(shí)，電表的指針必須位于零刻度上。若不是這種情況，需進(jìn)行機(jī)械調(diào)零。 </p> <p> 比色皿使用完畢后，請(qǐng)立即用蒸餾水沖洗干凈，并用干凈柔軟的紗布將水跡擦去，以防止表面光潔度被破壞，影響比色皿的透光率。 </p> <p> 操作人員不應(yīng)輕易動(dòng)燈泡及反光鏡燈，以免影響光效率。 </p> <p> 1900型等分光光度計(jì)，由于其光電接收裝置為光電倍增管，它本身的特點(diǎn)是放大倍數(shù)大，因而可以用于檢測(cè)微弱光電信號(hào)，而不能用來檢測(cè)強(qiáng)光。否則容易產(chǎn)生信號(hào)漂移，靈敏度下降。 </p> <p> 針對(duì)其上述特點(diǎn)，在維修、使用此類儀器時(shí)應(yīng)注意不讓光電倍增管長(zhǎng)時(shí)間暴露于光下，因此在預(yù)熱時(shí)，應(yīng)打開比色皿蓋或使用擋光桿，避免長(zhǎng)時(shí)間照射使其性能漂移而導(dǎo)致工作不穩(wěn)。紫外可見光的范圍內(nèi)，對(duì)于一個(gè)特定的波長(zhǎng)，吸收的程度正比于試樣中該成分的濃度，可以進(jìn)行定性分析。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="雙光束紫外可見分光光度計(jì)排名,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png"></div><p> 當(dāng)你什么都不了解的情況下，只選貴的，準(zhǔn)沒錯(cuò)。在某種程度上，這句話具有一定的適用性。但是，新型儀器一般價(jià)格較貴，如果過度放寬儀器預(yù)算，而追加經(jīng)費(fèi)采購不需要的配件也是一種浪費(fèi)。如何快速簡(jiǎn)單的掌握紫外可見分光光度計(jì)的特性，從而進(jìn)行合適的采購定位，小編將所需要的知識(shí)點(diǎn)總結(jié)如下。 </p> <p> 認(rèn)識(shí)紫外可見光分光光度計(jì)使用范圍。任何一臺(tái)儀器都不是解決所有問題的同一把鑰匙。多問自己幾個(gè)問題：需要一臺(tái)什么樣的儀器，要用它來做什么，分析的樣品的形態(tài)、所需要的測(cè)試范圍以及精度要求在哪里等等。理清楚這些，儀器的基本輪廓就畫出來了。 </p> <p> 紫外可見光分光光度計(jì)作為一種常規(guī)的實(shí)驗(yàn)室分析儀器，可以常用于無機(jī)物、有機(jī)物的定性定量分析，所使用的科研領(lǐng)域包括：科研、制藥、化工、環(huán)保、衛(wèi)生等需要分析的關(guān)鍵領(lǐng)域。紫外可見分光光度計(jì)主要由光源系統(tǒng)、單色器系統(tǒng)、樣品室、檢測(cè)系統(tǒng)組成。雙光束紫外可見分光光度計(jì)排名</p><p style="text-indent:25px">傳統(tǒng)單光束UV紫外測(cè)試，測(cè)試過程全程封閉，單光束光源只通過光柵直接照射樣品，再經(jīng)光電倍增管檢測(cè)器檢測(cè)。雙光束紫外可見分光光度計(jì)排名</p><p> 定性定量。利用特定的吸收峰，快速對(duì)待測(cè)樣品進(jìn)行定性和定量分析。如聚六亞甲基雙胍鹽酸鹽的檢測(cè)。利用雙波長(zhǎng)，以很快的速度辨別是單胍還是雙胍，并進(jìn)行粗略定量。這是液相色譜無論如何也做不到的。 </p> <p> 測(cè)定透過率。透光率是一個(gè)物理詞匯，是表示光線透過介質(zhì)的的能力，是透過透明或半透明物體的光通量與其入射光通量的百分率。吸光度與透過率的換算公式 </p> <p> 透過率對(duì)于某些原料檢測(cè)是非常實(shí)用的，可對(duì)此類原料品質(zhì)進(jìn)行總體把控。 </p> <p> 雜質(zhì)的檢測(cè)。通過前處理將雜質(zhì)與主成分分離后，進(jìn)行紫外分光光度測(cè)定，可很快得到該雜質(zhì)的含量。以桑普實(shí)驗(yàn)室這十幾年對(duì)苯氧乙醇中雜質(zhì)苯酚的測(cè)定方法改進(jìn)過程為例： </p> <p> 之后建立了4-氨基安替比林比色法，可實(shí)現(xiàn)對(duì)苯氧乙醇含量20、40、60、80、100ppm的區(qū)分；紫外分光光度法 </p> <p> 期間同時(shí)采用EP中紫外分光光度法，并將其進(jìn)行適當(dāng)改進(jìn)，作為修訂后的企標(biāo)。該方法便利快速，可實(shí)現(xiàn)50ppm以上的定量檢測(cè)。HPLC-DAD </p> <p> 近兩年，桑普對(duì)產(chǎn)品品質(zhì)把控更嚴(yán)格，希望能實(shí)現(xiàn)幾個(gè)ppm的定量檢測(cè)。所以采用了HPLC-DAD作為企標(biāo)對(duì)其檢測(cè)。雙光束紫外可見分光光度計(jì)排名</p><p style="text-indent:25px">上海儀電分析儀器有限公司專注技術(shù)創(chuàng)新和產(chǎn)品研發(fā)，發(fā)展規(guī)模團(tuán)隊(duì)不斷壯大。公司目前擁有較多的高技術(shù)人才，以不斷增強(qiáng)企業(yè)重點(diǎn)競(jìng)爭(zhēng)力，加快企業(yè)技術(shù)創(chuàng)新，實(shí)現(xiàn)穩(wěn)健生產(chǎn)經(jīng)營。上海儀電分析儀器有限公司主營業(yè)務(wù)涵蓋分光光度計(jì)，氣相色譜，原子吸收，食品安全，堅(jiān)持“質(zhì)量保證、良好服務(wù)、顧客滿意”的質(zhì)量方針，贏得廣大客戶的支持和信賴。公司深耕分光光度計(jì)，氣相色譜，原子吸收，食品安全，正積蓄著更大的能量，向更廣闊的空間、更寬泛的領(lǐng)域拓展。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2021559.html</p></div></div></div></div></div><div id="arogseg" class="page-right twoColRt"><div id="lqskrya" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="mby27c7" 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(qiáng) 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