食品安全紫外可見分光光度計廠家客戶至上上海儀電分析儀器供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="兩者有所同，又有所不同。定量分析的原則同，而測量所需的光能量不同：原子吸收為X射線，能量大，食品安全紫外可見分光光度計廠家，可激發(fā)電子從低的原子軌道向高的原子軌道躍遷.紫外可見吸收為紫外光及可見光，能量小，只能激發(fā)電子從分子軌道向MAX低（"><meta name="keywords" content="食品安全紫外可見分光光度計廠家,紫外可見分光光度計"><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/zh/"><span>展會信息</span></a></li></ul></div></nav><section class="wrap clearfix"><section class="container clearfix tcPro"><section class="home-main container clearfix"><div id="sayek0s" class="twoCol"><div id="0ki8scs" 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_fenxiyiqi/">分析儀器</a>?<a href="http://www.cdcfah.com/cp/third-fenxiyiqi_zwfxy/">紫外分析儀</a>?食品安全紫外可見分光光度計廠家客戶至上上海儀電分析儀器供應(yīng)</p><div id="euc0ms0" class="leftbox clearfix"><h1>食品安全紫外可見分光光度計廠家客戶至上上海儀電分析儀器供應(yīng)</h1><div id="kqy0ywk" class="proBig"><div id="okaqoaw" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="2gec0gm" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="mcsq0yo" 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>食品安全紫外可見分光光度計廠家,紫外可見分光光度計</p><p><span>***更新：</span>2021-01-12 03:13:26</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="ggoekwu" 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="0mk0kiq" class="page-proshow02"><p class="title">詳細說明</p><div id="uk2i8u0" class="box"><p><p> 兩者有所同，又有所不同。定量分析的原則同，而測量所需的光能量不同： </p> <p> 原子吸收為X射線，能量大，食品安全紫外可見分光光度計廠家，可激發(fā)電子從低的原子軌道向高的原子軌道躍遷. </p> <p> 紫外可見吸收為紫外光及可見光，能量小，只能激發(fā)電子從分子軌道向MAX低（或次低）的空的分子軌道躍遷。 </p> <p> 通俗的說，原子吸收分光光度計是用較高的溫度來燃燒分子，使之原子化（變?yōu)榛鶓B(tài)原子），再通過特征輻射，把基態(tài)原子激發(fā)，食品安全紫外可見分光光度計廠家，并吸收能量，通過這個能量差（透過率）來計算出濃度。而紫外—可見分光光度計是通過顯色劑（一種能和我們被測元素產(chǎn)生絡(luò)合反應(yīng)的分子），食品安全紫外可見分光光度計廠家，與我們的被測元素產(chǎn)生反應(yīng)，并且反應(yīng)物分子帶有特定的顏色，經(jīng)過分子吸收氘燈（紫外區(qū)）或鎢燈（可見區(qū)）的照射，吸收燈發(fā)射的能量，通過能量差（透過率）來計算出濃度。原子吸收分光光度計與紫外可見分光光度計的區(qū)別介紹 </p> <p> 原理： </p> <p> 原子吸收觀察的是構(gòu)成物質(zhì)的元素（原子）中的電子在原子軌道中的躍遷，屬于原子吸收. </p> <p> 紫外可見光吸收觀察的是構(gòu)成物質(zhì)的分子中的電子在分子軌道中的躍遷，屬于分子吸收. </p> <p> 能量: 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-multiplier tubes，PMTs）和光敏二極管。食品安全紫外可見分光光度計廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="食品安全紫外可見分光光度計廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png"></div><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?？梢姽夥秶２捎貌ＡЮ忡R，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。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(xué)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> <br /> 食品安全紫外可見分光光度計廠家紫外可見分光光度計使對難溶元素的測定靈敏度還不夠理想。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="食品安全紫外可見分光光度計廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593808795839/2949755.png"></div><p> 很多眼鏡都號稱是防紫外線的，這些眼鏡真的防紫外線嗎？ </p> <p> 早期的眼鏡是玻璃的，玻璃的很重，硬度高，現(xiàn)在幾乎被樹脂材料取代了。 </p> <p> 這些眼鏡是不是真的防紫外線呢？我們實驗室的用數(shù)據(jù)來說話，很簡單的方法，只要我們有一臺紫外分光光度計就可以了。 </p> <p> 這里選擇了三款眼鏡，A款是公司要求佩戴的護目鏡，B款是可變色的近視眼鏡，C款為無框的近視眼鏡。 </p> 你的眼鏡真的防紫外嗎？紫外分光光度計告訴你市場上的眼鏡多種多樣，有的近視沒辦法必須佩戴眼鏡，有的為了美觀，佩戴個眼鏡，還有些工作要求，需要佩戴眼鏡保護眼鏡。 <p> <br /> </p> <p> 在紫外分光光度計，選擇200-400nm波長掃描，間隔1nm就可以了，節(jié)約時間可以設(shè)置為間隔2nm。空氣做空白掃描后，將各眼鏡放置在比色皿的位置，目的是讓光能穿過眼鏡，再波長掃描。 </p><p> 紫外可見分光光度計定量、定性分析需注意的問題 </p> <p> 重復(fù)測定次數(shù)和波長掃描速度：對吸光度不是很大的樣品，或者狹縫不是很小，這是檢測器檢測的光信號的強度是比較大的，重復(fù)性較好，可選擇較少的重復(fù)次數(shù)。相反，如果樣品吸光度很大，狹縫很小，選擇較大的重復(fù)次數(shù)可獲得更好的結(jié)果。5測定波長間隔：在掃描光譜時需要選擇，可根據(jù)樣品吸收峰的寬度進行選擇，峰寬較大時，可選擇較大的波長間隔。反之亦反。通常每個正常的吸收峰應(yīng)該用不少于30個數(shù)據(jù)點表示出來。波長范圍越寬的價格越貴;波長準確度及雜散光參數(shù)的數(shù)值越低，表示性能越好。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="食品安全紫外可見分光光度計廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png"></div><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。光學(xué)構(gòu)造（OPTICALCONFIGURATION）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。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(xué)性。工廠紫外可見分光光度計代理</p><p style="text-indent:25px">金屬離子常與有機物形成絡(luò)合物，多數(shù)絡(luò)合物在紫外可見區(qū)是有吸收的，我們可以利用分光光度法來研究其組成。食品安全紫外可見分光光度計廠家</p><p> 紫外-可見吸收光譜為什么有些化合物是有色的，而另一些化合物卻沒有？共軛與顏色有什么關(guān)系？我們必須對光譜中可見光部分和附近的不同波長處的光吸收進行精確測量。商業(yè)光譜儀可對光譜中近紫外和可見部分光吸收進行精確測量。 </p> <p> 可見光區(qū)域的光子能量為36-72kcal/mol，近紫外線區(qū)域（至200nm）的能量范圍擴展至143kcal/mole。波長小于200nm的紫外線輻射難以處理，因此很少用作結(jié)構(gòu)分析的常規(guī)工具。 </p> <p> 當一束光照射物質(zhì)時，上述能量會激發(fā)分子電子至更高能量的軌道。下圖顯示了有機分子中發(fā)生的各種電子激發(fā)的示意圖，其包含六個躍遷。通常，只有三個低能量躍遷是通過200至800nm光的能量實現(xiàn)的，也就是說，能夠吸收200-800nm區(qū)域光的分子應(yīng)具有π電子系統(tǒng)和具有未成對電子對的雜原子。這種吸光基團稱為生色團。 </p> <p> 當樣品分子暴露于具有與分子內(nèi)可能的電子躍遷相匹配能量的光時，電子受光子激發(fā)從高的占據(jù)分子軌道（HOMO）躍遷到低的未占據(jù)分子軌道（LUMO），一些光能將被吸收，所產(chǎn)生的物質(zhì)稱為激發(fā)態(tài)物質(zhì)。光譜儀記錄吸收波長以及每個波長的吸收程度，所得光譜用吸光度（A）與波長的關(guān)系圖表示。吸光度通常在0（無吸收）到2（99％吸收）的范圍內(nèi)。食品安全紫外可見分光光度計廠家</p><p style="text-indent:25px">上海儀電分析儀器有限公司是一家儀器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術(shù)進出口業(yè)務(wù)。【依法須經(jīng)批準的項目，經(jīng)相關(guān)部門批準后方可開展經(jīng)營活動】儀器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術(shù)進出口業(yè)務(wù)?！疽婪毥?jīng)批準的項目，經(jīng)相關(guān)部門批準后方可開展經(jīng)營活動】的公司，是一家集研發(fā)、設(shè)計、生產(chǎn)和銷售為一體的專業(yè)化公司。儀電分析擁有一支經(jīng)驗豐富、技術(shù)創(chuàng)新的專業(yè)研發(fā)團隊，以高度的專注和執(zhí)著為客戶提供分光光度計，氣相色譜，原子吸收，食品安全。儀電分析致力于把技術(shù)上的創(chuàng)新展現(xiàn)成對用戶產(chǎn)品上的貼心，為用戶帶來良好體驗。儀電分析始終關(guān)注自身，在風云變化的時代，對自身的建設(shè)毫不懈怠，高度的專注與執(zhí)著使儀電分析在行業(yè)的從容而自信。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2807420.html</p></div></div></div></div></div><div id="eki0o82" class="page-right twoColRt"><div 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