上海紫外可見分光光度計排行鑄造輝煌上海儀電分析儀器供應-b2b網(wǎng)站_b2b電子商務平臺【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="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"><meta name="keywords" content="上海紫外可見分光光度計排行,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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clearfix"><h1>上海紫外可見分光光度計排行鑄造輝煌上海儀電分析儀器供應</h1><div id="hvx7dfb" class="proBig"><div id="mv78vx8" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="7iph8fb" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="32bipbd" 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)品關鍵詞：</span>上海紫外可見分光光度計排行,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-15 06:17:34</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="j7yvnzb" 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="mnuwtkh" class="page-proshow02"><p class="title">詳細說明</p><div id="h2by8zb" class="box"><p><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，上海紫外可見分光光度計排行。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，上海紫外可見分光光度計排行。 </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?？梢訫IN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 /> 按所吸收光的波長區(qū)域不同，上海紫外可見分光光度計排行，分為紫外分光光度法和可見分光光度法，合稱為紫外-可見分光光度法。上海紫外可見分光光度計排行</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海紫外可見分光光度計排行,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png"></div>紫外可見分光光度計的基本結(jié)構(gòu) <p> 紫外可見分光光度計的工作原理是由光源發(fā)出連續(xù)輻射光，經(jīng)單色器按波長大小色散為單色光，單色光照射到吸收池，一部分被樣品溶液吸收，未被吸收的光經(jīng)檢測器的光電管將光強度變化轉(zhuǎn)變?yōu)殡娦盘栕兓?，并?jīng)信號顯示系統(tǒng)調(diào)制放大后，顯示或打印出吸光度A（或透射比T），完成測定。 </p> <p> 一、光源 </p> <p> 光源是提供符合要求的入射光的裝置，紫外可見分光光度計可見光區(qū)常用的光源為鎢燈，紫外光區(qū)常用的光源為氫燈或氘燈。 </p> <p> 1.1．鎢燈 </p> <p> 鎢燈是常用的可見光光源，它可發(fā)射的波長為325~2500nm的連續(xù)光譜，其中適宜的使用波長范圍為320~1000nm，因此，也可用做近紅外光源。電能將鎢燈加熱到白熾時，發(fā)出的光強度在各波段的分布隨燈絲溫度而變化。燈絲的溫度取決于電源電壓。電源電壓的微小波動都會引起鎢光強度的很大變化。因此必須使用穩(wěn)壓電源供電，鎢燈工作電壓為12V，也可以使用12V的直流電源供電。鎢燈的壽命一般可達10000小時以上。 </p> <p> 目前很多光度計采用鹵鎢燈代替鎢燈，如7230G型、752PLUS型分光光度計等。鹵鎢燈具有較高的發(fā)光效率和較長的使用壽命。高校紫外可見分光光度計性價比通常我們所理解的單色光，只是存于理想狀態(tài)下，實際上得到的“單色光”，是帶有一定寬度和波長范圍的譜帶。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海紫外可見分光光度計排行,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593893024301/8360761.png"></div><p style="text-indent:25px">使用紫外可見分光光度計進行定量和定性分析需注意以下一些問題：1吸光度讀數(shù)范圍：吸光度測量誤差在透過率過大或過小時都會變大，為了滿足定量分析的誤差要求（<5%），在定量分析時要求吸光度應在一定的范圍內(nèi)，這個范圍的具體值與儀器性能有關，主要是與紫外可見分光光度計檢測系統(tǒng)噪聲大小有關，但通常都在0.1~1.0范圍內(nèi)，如果儀器的檔次更低，則范圍更窄。根據(jù)朗伯比爾定律，影響吸光度大小的因素主要是樣品摩爾吸光系數(shù)，濃度和比色皿光程。實驗中吸光度過大的樣品可通過稀釋樣品使吸光度到所需范圍內(nèi)。如果樣品不能稀釋，可以改用光程較小的比色皿減小吸光度。吸光度過小的樣品可使用光程較大的比色皿以增大吸光度。</p><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系。吸光度值與測定濃度不成直線關系，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。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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海紫外可見分光光度計排行,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png"></div><p> 使用紫外可見分光光度計時需要注意哪些方面？ </p> <p> 1、使用的吸收池必須潔凈，并注意配對使用。量瓶、移液吸管均應校正、洗凈后使用。 </p> <p> 2、取吸收池時，手指應拿毛玻璃面的兩側(cè)，裝盛樣品以池體的4/5為度，使用揮發(fā)性溶液時應加蓋，透光面要用擦鏡紙由上而下擦拭干凈，檢視應無溶劑殘留。吸收池放入樣品室時應注意方向相同。用后用溶劑或水沖洗干凈，晾干防塵保存。 </p> <p> 3、供試品溶液濃度除各該品種已有注明外，其吸收度以在0.3～0.7之間為宜。 </p> <p> 4、測定時除另有規(guī)定外，應以配制供試品溶液的同批溶劑為空白對照，采用1cm石英吸收池，在規(guī)定的吸收峰±2nm以內(nèi)，測幾個點的吸收度或由儀器在規(guī)定的波長附近自動掃描測定，以核對供試品的吸收峰位置是否正確，并以吸收度MAX的波長作為測定波長，除另有規(guī)定外吸收度MAX波長應在該品種項下規(guī)定的測定波長±2nm以內(nèi)。 </p> <p> 5、供試品應取2份，如為對照品比較法，對照品一般也應取2份。平行操作，每份結(jié)果對平均值的偏差應在±0.5%以內(nèi)。 </p> <p> 6、選用儀器的狹縫寬度應小于供試品吸收帶的半寬度，否則測得的吸收度值會偏低，狹縫寬度的選擇應以減少狹縫寬度時供試品的吸收度不再增加為準，對于大部分被測品種，可以使用2nm縫寬。<span style="display:none;"></span> 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多數(shù)難題的儀器。低端紫外可見分光光度計多少錢</p><p style="text-indent:25px">紫外可見分光光度計基本工作原理和紅外光譜儀相似，利用一定頻率的紫外可見光照射被分析的有機物質(zhì)。上海紫外可見分光光度計排行</p><p> 如何正確使用752N紫外可見分光光度計 </p> <p> A：在使用紫外可見分光光度計時候，設備儀器使用之前，一定需要能夠把樣品室內(nèi)存放的防潮劑給拿出來，且在設備正常運轉(zhuǎn)檢查時候也不能開啟樣品室蓋；在檢查時候需注意比色皿當中的液體要能占總體積的百分之六十六到百分之八十比較好，千萬不能讓液體太多以至于液體外泄直接腐蝕儀器設備。 </p> <p> 當然在進行正常檢測時候，也要能確保比色皿干凈，當發(fā)現(xiàn)內(nèi)壁上有液滴就許使用專業(yè)的紙張給擦拭干凈，建議大家千萬不要使用手直接擦拭，以免造成對手的傷害。 </p> <p> B：在使用紫外可見分光光度計時，儀器設備在正常運轉(zhuǎn)的時候，一定要嚴禁把液體溶劑給直接放置于儀器的表層上，如果發(fā)現(xiàn)有溶劑液體出現(xiàn)外泄的情況，一定要進行及時的清潔和處理。 </p> <p> C：當使用紫外可見分光光度計檢測完畢后，還需要能夠及時把比色皿內(nèi)的液體給妥善處理掉，并還需要能夠使用蒸餾水給徹底清潔干凈，同時將比色皿進行倒置晾干處理；全部工作完成后還需把設備儀器電源給關閉，再將防潮劑放入到樣品室內(nèi)并做好防塵處理才好。上海紫外可見分光光度計排行</p><p style="text-indent:25px">上海儀電分析儀器有限公司位于徐塘路88號7幢4層、9幢。公司業(yè)務分為分光光度計，氣相色譜，原子吸收，食品安全等，目前不斷進行創(chuàng)新和服務改進，為客戶提供良好的產(chǎn)品和服務。公司注重以質(zhì)量為中心，以服務為理念，秉持誠信為本的理念，打造儀器儀表良好品牌。在社會各界的鼎力支持下，持續(xù)創(chuàng)新，不斷鑄造高品質(zhì)服務體驗，為客戶成功提供堅實有力的支持。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1998475.html</p></div></div></div></div></div><div id="r43zk2m" class="page-right twoColRt"><div id="cebdvce" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="k4tfxz2" 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" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強信息推薦自業(yè)物資供應</p></a></div><div id="ugxu2l2" 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