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clearfix"><div id="yrjldh3" class="twoCol"><div id="hkcelxz" class="page-proshow clearfix"><p class="current"> 當前位置:<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_gxyq/">光學儀器</a>?<a href="http://www.cdcfah.com/cp/third-gxyq_gpygdj/">光譜儀、光度計</a>?國內(nèi)**紫外可見分光光度計選擇歡迎咨詢上海儀電分析儀器供應(yīng)</p><div id="3cobyac" class="leftbox clearfix"><h1>國內(nèi)**紫外可見分光光度計選擇歡迎咨詢上海儀電分析儀器供應(yīng)</h1><div id="gebdvme" class="proBig"><div id="hqskh7d" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="7m2zdkr" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="x7riprd" 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>國內(nèi)**紫外可見分光光度計選擇,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-19 09:19:07</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="tmxubnk" 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="vtg3zbi" class="page-proshow02"><p class="title">詳細說明</p><div id="wzwyawd" class="box"><p><p> 關(guān)于吸光度測定重復(fù)性的問題分光光度計在測定過程中，發(fā)現(xiàn)同一個溶液在不同時問里其測定結(jié)果不同，即重復(fù)性不好，其原因是什么?排除測定錯誤因素外，可能原因有：(1)儀器預(yù)熱時間不夠或預(yù)熱方法不對所造成，應(yīng)延長預(yù)熱時間或采用正確的預(yù)熱方法。 </p> <p> (2)光電轉(zhuǎn)換器(如光電管)因長時間使用其光電轉(zhuǎn)換效率發(fā)生了變化導致。這時標準溶液與待測溶液的吸光度都同樣變低，在相對定量時對結(jié)果影響很小，國內(nèi)**紫外可見分光光度計選擇。但是對這類儀器，國內(nèi)**紫外可見分光光度計選擇，一般建議連續(xù)使用時間不應(yīng)超過3h，若需長時間使用，間歇30min，國內(nèi)**紫外可見分光光度計選擇。紫外可見光的范圍內(nèi)，對于一個特定的波長，吸收的程度正比于試樣中該成分的濃度，可以進行定性分析。國內(nèi)**紫外可見分光光度計選擇</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國內(nèi)**紫外可見分光光度計選擇,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png"></div><p> <br /> </p> <p> 自從60年前紫外分光光度計出現(xiàn)在實驗室的工作臺之后，已經(jīng)形成了一種能解決大部分難題的儀器，從單一波長的測量到高性能多光譜的測量分析。實驗室選擇時需要根據(jù)自己實驗室的需要和目的用途來考慮，光學構(gòu)造和光源、探測方法、樣品類型和數(shù)據(jù)處理等都是要考慮的因素。 </p> <p> <br /> </p> <p> 光學構(gòu)造（OPTICALCONFIGURATION） </p> <p> <br /> </p> <p> 一般來說，紫外光分光光度計分為單光束和雙光束兩類。顧名思義，單光束型主要是依賴單束光進行測量。一束給定波長的光通過對照物，然后再通過實際樣品溶液，就能得到吸光結(jié)果。 </p> <p> <br /> </p> <p> <br /> </p> <p> 雙光束型則是通過一個斬光輪（mirroredchopperwheel）將一束光分成兩束，分別測量對照樣品和實際樣品。可以MIN光漂移（lampdrift）和減少測量時間。一些雙光型光度計不利用斬光輪，而是利用一種光束分光器來代替，將一束光分成兩束平行的光然后同時測量對照樣品和目的樣品。因為增加了測量的速度，所以雙光束分光光度計在測量一些溶液隨時間動態(tài)變化的研究中大有用處。 </p> <p> <br /> 實驗室紫外可見分光光度計儀器在分光光度計的使用或檢定中,透射比(吸光度)的準確度直接關(guān)系到所測數(shù)據(jù)的可信性及科學性。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國內(nèi)**紫外可見分光光度計選擇,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png"></div><p> 紫外分光光度計的單色器是將光源發(fā)出的連續(xù)光譜分解成單色光，并能準確方便地“取出”所需要的某一波長的光的光學裝置，它是光度計的心臟。單色器主要由狹縫、色散元件和透鏡系統(tǒng)組成。其中色散元件是單色器的主要部件。常用的色散元件是棱鏡、光柵，或者是兩者的組合。 </p> <p> 棱鏡單色器是利用不同波長的光在棱鏡內(nèi)折射率不同將復(fù)合光色散為單色光，這種現(xiàn)象稱為棱鏡的色散作用。常用的棱鏡由玻璃或石英制成。可見光范圍常采用玻璃棱鏡，其色散力強，價格低廉，但是玻璃吸收紫外光，所以不宜用于紫外光區(qū)。紫外光范圍常用石英作為材料，石英棱鏡的工作波長范圍為185~4000nm，在紫外光區(qū)有較好的分辨力，而且也適用于可見光區(qū)和近紅外光區(qū)。棱鏡單色器的特點是波長越短，色散程度越好。越趨向長波，色散程度越差，所以，單色器用棱鏡的分光光度計，其波長刻度在紫外光區(qū)可達到0.2nm，而在長波段，只能達到5nm。 </p><p> 掌握紫外可見光分光光度計基本工作原理：一定頻率紫外可見光照射所需要分析的目標樣品，引起目標樣品中價電子發(fā)生躍遷，從而變現(xiàn)隨著吸收波長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)，特定波長吸收中，吸收程度正比于試樣成分濃度，因此，可進行光譜的定性分析。且根據(jù)吸收與已知濃度標樣比較，能進行定量分析。 </p> <p> 紫外可見光分光光度計種類及優(yōu)缺點對比：傳統(tǒng)機型：單光束UV、全程密閉、以光柵進行分光，標樣和測試樣品分別測試，全波段掃描時間至多2min；比例雙光束UV：單光束UV，全程密閉、經(jīng)光柵再經(jīng)棱鏡，全程密閉、標樣和測試樣品分別測試、測試靈敏度降低，全波段分析時間長。紫外分光光度計一般覆蓋190nm和380nm波長，通常利用氘燈照明。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國內(nèi)**紫外可見分光光度計選擇,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png"></div><p> 光柵實現(xiàn)上就是一系列等寬、等距離的平行狹縫，它是利用光的衍射與干涉作用制成的。光柵作為色散元件具有不少獨特的優(yōu)點，光柵單色器的分辨率比棱鏡單色器的分辨率高，可精確到0.2nm，而且可用的波長范圍也比棱鏡單色器的范圍寬。所以，目前生產(chǎn)的紫外可見分光光度計大多采用光柵作為色散元件。 </p> <p> 吸收池是用于盛裝待測液并決定待測溶液透光液層厚度的器皿，又稱比色皿。吸收池一般為長方體，也有圓形或其它形狀的。其底及兩側(cè)為毛玻璃，另兩面為光學透光面。根據(jù)光學透光面的材質(zhì)，吸收池又可分為玻璃吸收池和石英吸收池兩種。玻璃吸收池用于可見光區(qū)測定，石英吸收池用于紫外光區(qū)的測定。吸收池的規(guī)格以光程為標志。常用的吸收池規(guī)格有0.5cm、1.0cm、2.0cm、3.0cm、5.0cm等。外可見分光光度計經(jīng)不斷改進，又出現(xiàn)自動記錄、自動打印、數(shù)字顯示、微機控制等各種類型的儀器。實驗室紫外可見分光光度計儀器</p><p style="text-indent:25px">紫外分光光度計儀器使用一定周期后，由維修工程師或在工程師指導下定期開啟儀器外罩對內(nèi)部進行除塵工作。國內(nèi)**紫外可見分光光度計選擇</p><p> 分光光度計的帶寬（bandwidth）很大程度上依賴于單色儀的狹縫的寬度?？梢酝渡涑鰧嶒灳_要求的光譜。一種嚴格帶寬使得儀器能對復(fù)雜的混合物進行高分辨率的吸光測量?？勺兊膯紊珒x的狹縫寬度能使一臺分光光度計滿足多種實驗需要。 </p> <p> 為了測量吸光值，分光光度計制造商通常使用光電倍增管（photo-multipliertubes，PMTs）和光敏二極管。PMTs提供快速的反應(yīng)時間和良好的靈敏度，并且可以在紫外光譜調(diào)節(jié)至特定的范圍。但一些制造商依賴于光敏二極管的動態(tài)范圍在數(shù)秒內(nèi)行使所有的光譜測量。國內(nèi)**紫外可見分光光度計選擇</p><p style="text-indent:25px">上海儀電分析儀器有限公司是一家生產(chǎn)型類企業(yè)，積極探索行業(yè)發(fā)展，努力實現(xiàn)產(chǎn)品創(chuàng)新。是一家有限責任公司企業(yè)，隨著市場的發(fā)展和生產(chǎn)的需求，與多家企業(yè)合作研究，在原有產(chǎn)品的基礎(chǔ)上經(jīng)過不斷改進，追求新型，在強化內(nèi)部管理，完善結(jié)構(gòu)調(diào)整的同時，良好的質(zhì)量、合理的價格、完善的服務(wù)，在業(yè)界受到寬泛好評。以滿足顧客要求為己任；以顧客永遠滿意為標準；以保持行業(yè)優(yōu)先為目標，提供***的分光光度計，氣相色譜，原子吸收，食品安全。儀電分析自成立以來，一直堅持走正規(guī)化、專業(yè)化路線，得到了廣大客戶及社會各界的普遍認可與大力支持。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2056332.html</p></div></div></div></div></div><div id="bphzbiz" class="page-right twoColRt"><div id="rgnpwyp" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="xm7togd" 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配件哪家強信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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