建材紫外可見分光光度計單價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="紫外可見分光光度計定量、定性分析需注意的問題重復測定次數(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，重復性較好，可選擇較少的重復次數(shù)。相反，建材紫外可見分光光度計單價，如果樣品吸光度很大"><meta name="keywords" content="建材紫外可見分光光度計單價,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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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</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>?建材紫外可見分光光度計單價鑄造輝煌上海儀電分析儀器供應</p><div id="aguaoc8" class="leftbox clearfix"><h1>建材紫外可見分光光度計單價鑄造輝煌上海儀電分析儀器供應</h1><div id="88q8iws" class="proBig"><div id="sg8qwso" 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="eciwkes" 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="808ou2k" 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>建材紫外可見分光光度計單價,紫外可見分光光度計</p><p><span>***更新：</span>2020-10-31 10:24:51</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="guekqei" 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="8mgm8io" class="page-proshow02"><p class="title">詳細說明</p><div id="yo0k0i2" class="box"><p><p style="text-indent:25px"><p>紫外可見分光光度計定量、定性分析需注意的問題<p>重復測定次數(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，重復性較好，可選擇較少的重復次數(shù)。相反，建材紫外可見分光光度計單價，如果樣品吸光度很大，狹縫很小，建材紫外可見分光光度計單價，選擇較大的重復次數(shù)可獲得更好的結果。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，建材紫外可見分光光度計單價，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該用不少于30個數(shù)據(jù)點表示出來。分光光度計是杜包斯克(Duboscq)和奈斯勒(Nessler)等人在1854年將朗伯-比爾定律應用于定量分析化學領域。建材紫外可見分光光度計單價</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="建材紫外可見分光光度計單價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png"></div><p> 關于吸光度測定重復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果不同，即重復性不好，其原因是什么?排除測定錯誤因素外，可能原因有：(1)儀器預熱時間不夠或預熱方法不對所造成，應延長預熱時間或采用正確的預熱方法。 </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，在相對定量時對結果影響很小。但是對這類儀器，一般建議連續(xù)使用時間不應超過3h，若需長時間使用，間歇30min。教學紫外可見分光光度計排行測量吸光度并不是測量透過吸收池的光強度，而是將光強度轉(zhuǎn)換成電流進行測量，稱為紫外分光光度計的檢測器。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="建材紫外可見分光光度計單價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><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，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。 </p><p> 進行單波長測量時，需要考慮朗伯比爾定律對入射光單色性的要求和測定靈敏度的要求。沒有干擾時，一般選擇在吸收峰的MAX吸收波長位置處，如果有干擾，選擇在沒有干擾且吸光度變化較平緩的位置。進行多波長校正時，除盡量滿足單波長測定的波長要求外，還要求多個組分間的吸收光譜間線性無關。 </p> <p> 紫外分光光度計狹縫的大小會影響到儀器的信噪比和標準曲線的線性范圍。狹縫過大，通常會使線性范圍變小，特別是當不在MAX吸收波長位置測定時更是如此。狹縫過小，信噪比變差，基線平直度和測量數(shù)據(jù)的重復性會變差。此外，還需要考慮樣品吸收峰寬度的影響。通常單波長測定時，一般選擇在MAX吸收波長位置，線性范圍容易滿足，可選擇較寬的狹縫（1~2nm）多波長測定時，很難同時在所有波長都滿足線性范圍要求，應選擇比較小的狹縫。紫外可見光分光光度計是使用紫外光譜特點而設計制造的光學儀器。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="建材紫外可見分光光度計單價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png"></div>紫外可見分光光度計的基本結構 <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⒔?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。大部分單機型的分光光度計包含了驅(qū)動儀器運行和管理數(shù)據(jù)的軟件。與PC機一起聯(lián)用，需要從制造商購買軟件。車載紫外可見分光光度計單價</p><p style="text-indent:25px">為了選擇合適的狹縫寬度，應以減少狹縫寬度時紫外分光光度計試樣的吸光度不再增加為準。建材紫外可見分光光度計單價</p><p> 光學構造（OPTICAL CONFIGURATION）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，就能得到吸光結果。 </p> <p> 雙光束型則是通過一個斬光輪（mirrored chopper wheel）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（lamp drift）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。建材紫外可見分光光度計單價</p><p style="text-indent:25px">上海儀電分析儀器有限公司致力于儀器儀表，是一家生產(chǎn)型的公司。儀電分析致力于為客戶提供良好的分光光度計，氣相色譜，原子吸收，食品安全，一切以用戶需求為中心，深受廣大客戶的歡迎。公司秉持誠信為本的經(jīng)營理念，在儀器儀表深耕多年，以技術為先導，以自主產(chǎn)品為重點，發(fā)揮人才優(yōu)勢，打造儀器儀表良好品牌。儀電分析憑借創(chuàng)新的產(chǎn)品、專業(yè)的服務、眾多的成功案例積累起來的聲譽和口碑，讓企業(yè)發(fā)展再上新高。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1788828.html</p></div></div></div></div></div><div id="q8mmsok" class="page-right twoColRt"><div id="wuymqew" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="qwu8ms0" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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