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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>?民用紫外可見分光光度計怎么樣服務(wù)為先上海儀電分析儀器供應(yīng)</p><div id="3ik4yv8" class="leftbox clearfix"><h1>民用紫外可見分光光度計怎么樣服務(wù)為先上海儀電分析儀器供應(yīng)</h1><div id="xg7wtf8" class="proBig"><div id="ayvplnk" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="n8ehe37" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="cgiso7y" 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>民用紫外可見分光光度計怎么樣,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-08 08:24:54</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="e22ylip" 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="u8qxuwd" class="page-proshow02"><p class="title">詳細說明</p><div id="3megda7" class="box"><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，民用紫外可見分光光度計怎么樣，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，民用紫外可見分光光度計怎么樣，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，民用紫外可見分光光度計怎么樣。紫外可見分光光度計在開機前將樣品室內(nèi)的干燥劑取出，儀器自檢過程中禁止打開樣品室蓋。民用紫外可見分光光度計怎么樣</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="民用紫外可見分光光度計怎么樣,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png"></div><p> 紫外可見分光光度計種類及優(yōu)缺點對比 </p> <p> <br /> </p> <p> 單光束UV：傳統(tǒng)的紫外，單光源發(fā)射單光束，全程密閉，通過光柵，照射樣品，由光電倍增管監(jiān)測器檢測。 </p> <p> 缺點：測完空白再測試樣品，全波段分析時間較長（一般2min）。2比例雙光束UV：單光源單光束，全程密閉，通過光柵，加入棱鏡，把光分為兩束，分別照射樣品與空白，再合并光，進入光電倍增管檢測器，通過差減法計算結(jié)果。 </p> <p> 好處：空白樣品同時檢測。 </p> <p> 缺點：靈敏度下降，全波段分析時間較長。3雙光束UV：單光源單光束，全程密閉，通過棱鏡分出兩道光，分別通過一光柵，分別進入各自的光點倍增管檢測器。 </p> <p> 好處：加強靈敏度，同時測量空白與樣品。 </p> <p> 缺點：全波段分析時間較長。4全波段UV：單光源單光束，樣品與空白暴露在空氣中，照射樣品，開始進入密閉箱，通過光柵，進入DAD檢測器。 </p> <p> 好處：空白只需要檢測一次，如果你愿意一輩子檢測這一次都可以。檢測樣品不密閉，外界光線對其無影響，使用方便且精確。分析任何波段或全波段不到1s。 </p> <p> 缺點：貴。（25W）中國**紫外可見分光光度計銷售廠家紫外分光光度計可用于藥品的鑒別、純度檢查及含量測定，既可以定性分析，又可以定量分析。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="民用紫外可見分光光度計怎么樣,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png"></div><p> 當以空白試劑為參比調(diào)節(jié)儀器零點時，比色皿窗材料的吸收、內(nèi)外窗面的散射以及溶劑的吸收等都被抵消，所得吸光度值完全由顯色溶液中待測離了濃度所決定。此時吸光度值與試液濃度一般呈線性關(guān)系。吸光度值與測定濃度不成直線關(guān)系，發(fā)生向下彎曲(負偏離)或向上彎曲(正偏離)的現(xiàn)象而偏離朗伯一比爾定律的主要原因如下。 </p> <p> <br /> </p> <p> (1)非單色光的影響：紫外一可見分光光度訃使用連續(xù)光源和分光器分光，不可能得到真正理想的單色光；為保證在測量中能得到充分的光強，儀器必須保持一定的狹縫寬度。由狹縫射出后投射到被測物質(zhì)上的光，是一個有限寬度的譜帶——光譜通帶。隨光譜通帶寬度的增大，吸收光譜的分辨率降低，并偏離朗伯一比爾定律。 </p> <p> (2)非吸收光的影響：當來自出射狹縫的光的光譜通帶寬度大于吸收光譜譜帶時，投射在被測物質(zhì)上的光就含有非吸收光。這不僅能使靈敏度降低，且能使校準曲線向橫坐標軸彎曲而偏離朗伯一比爾定律。 </p><p> 定性定量。利用特定的吸收峰，快速對待測樣品進行定性和定量分析。如聚六亞甲基雙胍鹽酸鹽的檢測。利用雙波長，以很快的速度辨別是單胍還是雙胍，并進行粗略定量。這是液相色譜無論如何也做不到的。 </p> <p> 測定透過率。透光率是一個物理詞匯，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> 透過率對于某些原料檢測是非常實用的，可對此類原料品質(zhì)進行總體把控。 </p> <p> 雜質(zhì)的檢測。通過前處理將雜質(zhì)與主成分分離后，進行紫外分光光度測定，可很快得到該雜質(zhì)的含量。以桑普實驗室這十幾年對苯氧乙醇中雜質(zhì)苯酚的測定方法改進過程為例： </p> <p> 之后建立了4-氨基安替比林比色法，可實現(xiàn)對苯氧乙醇含量20、40、60、80、100ppm的區(qū)分；紫外分光光度法 </p> <p> 期間同時采用EP中紫外分光光度法，并將其進行適當改進，作為修訂后的企標。該方法便利快速，可實現(xiàn)50ppm以上的定量檢測。HPLC-DAD </p> <p> 近兩年，桑普對產(chǎn)品品質(zhì)把控更嚴格，希望能實現(xiàn)幾個ppm的定量檢測。所以采用了HPLC-DAD作為企標對其檢測。紫外-可見分光光度法是利用某些物質(zhì)的分子吸收200--800nm光譜區(qū)的輻射來進行分析測定的方法。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="民用紫外可見分光光度計怎么樣,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593893024301/8360761.png"></div><p> 雙光束UV：經(jīng)棱鏡分光后通過光柵，加強了靈敏度，同時測量空白樣品與目標樣品的優(yōu)點，全波段分析時間長。全波段UV：樣品與空白樣品可以暴露在空氣中，照射樣品后，進入密閉箱，通過光柵，進入DAD檢測器檢測。檢測樣品不需要密閉，外界光線對測試無影響，使用方便準確且空白只需要檢測一次，全波段分析時間小于1s。 </p> <p> 紫外可見光分光光度計的體積大小以及外觀美學性。紫外可見分光光度計的儀器體積大小，會牽扯儀器所需要的擺放位置以及儀器使用的方便程度。 </p> <p> 儀器的外形美觀，給人以大氣、上檔次、舒適、新鮮的感覺。首先，會讓使用儀器者對儀器分外的愛護、維護和保養(yǎng)，有利于延長儀器的使用壽命。同時，也會讓儀器使用者的工作環(huán)境更舒適、優(yōu)美，也有利于提高工作效率。 </p> <p> 紫外可見光分光光度計儀器使用范圍。紫外可見光分光光度的使用范圍是有儀器的性能指標所決定。采購紫外可見光分光光度計根據(jù)測試樣品的具體要求，參考儀器的使用范圍，滿足即可，不必苛求。當然，土豪可以忽略。在操作紫外可見分光光度計時，操作人員需要留意一下機器的干燥劑。高性能紫外可見分光光度計廠家</p><p style="text-indent:25px">紫外可見分光光度計主要由光源系統(tǒng)、單色器系統(tǒng)、樣品室、檢測系統(tǒng)組成。民用紫外可見分光光度計怎么樣</p><p style="text-indent:25px">關(guān)于波長準確度的檢查與校正日常在使用分光光度計時，是否要經(jīng)常進行儀器波長準確度的檢查?答案是否定的。當在日常測定中發(fā)現(xiàn)儀器測定靈敏度下降，這時才應(yīng)進行波長準確度的檢查，簡易的檢查方法(粗檢)是：儀器開機后，調(diào)節(jié)波長為580nm，在吸收池座的通光道中插入一張白色卡片紙，若能觀察到一長方形的黃色光斑，說明波長準確度屬正常范圍，否則就應(yīng)進行波長校正。當儀器經(jīng)過長途搬運、受過機械振動或更換光源燈泡后，必須進行波長準確度的檢查與校正。粗檢同上，其校正方法有：干涉濾光片或鐠釹濾光片校正法、利用氘燈的特征發(fā)射線校正法。具體步驟可參考儀器使用說明書。民用紫外可見分光光度計怎么樣</p><p style="text-indent:25px">上海儀電分析儀器有限公司坐落在徐塘路88號7幢4層、9幢，是一家專業(yè)的儀器儀表、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】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】公司。一批專業(yè)的技術(shù)團隊，是實現(xiàn)企業(yè)戰(zhàn)略目標的基礎(chǔ)，是企業(yè)持續(xù)發(fā)展的動力。公司以誠信為本，業(yè)務(wù)領(lǐng)域涵蓋分光光度計，氣相色譜，原子吸收，食品安全，我們本著對客戶負責，對員工負責，更是對公司發(fā)展負責的態(tài)度，爭取做到讓每位客戶滿意。公司力求給客戶提供全數(shù)良好服務(wù)，我們相信誠實正直、開拓進取地為公司發(fā)展做正確的事情，將為公司和個人帶來共同的利益和進步。經(jīng)過幾年的發(fā)展，已成為分光光度計，氣相色譜，原子吸收，食品安全行業(yè)出名企業(yè)。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1901744.html</p></div></div></div></div></div><div id="cgdvnfx" class="page-right twoColRt"><div id="8dphelc" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="k7zwj2b" class="recomPic likePro"><a 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