教學紫外可見分光光度計對比客戶至上上海儀電分析儀器供應-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="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，教學紫外可見分光光度計對比，除盡量滿足單"><meta name="keywords" content="教學紫外可見分光光度計對比,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 http-equiv="Cache-Control" 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src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="m2ealza" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="bykb7vg" 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>教學紫外可見分光光度計對比,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-18 09:20:29</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="beawnep" 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="goflm3m" class="page-proshow02"><p class="title">詳細說明</p><div id="j73zv27" class="box"><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，教學紫外可見分光光度計對比，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(guān)。 </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，教學紫外可見分光光度計對比，信噪比變差，教學紫外可見分光光度計對比，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。紫外分光光度計（UV Spectrophotometer）在實驗室長期在分析領(lǐng)域扮演很重要的角色。教學紫外可見分光光度計對比</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="教學紫外可見分光光度計對比,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png"></div><p> 紫外分光光度計--注意事項 </p> <p> 1．該儀器應放在干燥的房間內(nèi)，使用時放置在堅固平穩(wěn)的工作臺上，室內(nèi)照明不宜太強。熱天時不能用電扇直接向儀器吹風，防止燈泡燈絲發(fā)亮不穩(wěn)定。 </p> <p> 2．使用本儀器前，使用者應該首先了解本儀器的結(jié)構(gòu)和工作原理，以及各個操縱旋鈕之功能。在未按通電源之前，應該對儀器的安全性能進行檢查，電源接線應牢固，通電也要良好，各個調(diào)節(jié)旋鈕的起始位置應該正確，然后再按通電源開關(guān)。 </p> <p> 3．在儀器尚未接通電源時，電表指針必須于“0”刻線上，若不是這種情況，則可以用電表上的校正螺絲進行調(diào)節(jié)。材料紫外可見分光光度計報價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="教學紫外可見分光光度計對比,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><p> 雜散光：典型值是0.01～0.05%T，在國外的產(chǎn)品中有65種產(chǎn)品的雜散光指標在這一范圍中。雜散光超過0.05%T的產(chǎn)品有31種，小于0.01%T的產(chǎn)品有19種。。從其光學設(shè)計看，都采用了雙單色器。與掃描光柵型產(chǎn)品相比，固定光柵的分光光度計少了出射狹縫，實現(xiàn)低雜散光的難度更大。從性能指標來看，范圍是0.01～1%T。26種固定光柵型產(chǎn)品中雜散光在0.01～0.05%T之間的有13種，也已達到半數(shù)，但是能夠低于0.01%T的很少。波長準確性，國外的典型水平是0.1～1nm。國內(nèi)產(chǎn)品中，處于此范圍的有16種，基本達到同一水平，但沒有優(yōu)于0.1nm的產(chǎn)品。國內(nèi)產(chǎn)品的光度準確性大多以透過率表示，水平比較接近，均在0.3～0.5%T之間。在10%T處，也就是吸光度為1A處，將光度準確性以吸光度表示，則數(shù)值為0.013～0.021A。與國外產(chǎn)品有比較明顯的差距。國內(nèi)產(chǎn)品的光度重復性基本在0.1～0.3%T范圍，同樣在吸光度1A處換算，數(shù)值為0.004～0.013A，也存在距離。比較國外與國內(nèi)產(chǎn)品的雜散光的典型值，兩者幾乎相差了一個數(shù)量級。但是已有一些較新研發(fā)的產(chǎn)品，可以達到國外產(chǎn)品的普遍水準。 </p><p> 我們都知道，紫外-可見分光光度計是實驗室中出鏡率相當高的分析儀器。 </p> <p> 那么你的使用情況如何呢？ </p> <p> 你所關(guān)注紫外-可見分光光度計的哪些性能？ </p> <p> 大家都來說說吧！分光光度法是通過測定被測物質(zhì)，在特定波長處或一定波長范圍內(nèi)光的吸光度或發(fā)光強度，對該物質(zhì)進行定性和定量分析的方法。紫外-可見分光光度計是元析儀器引用新型技術(shù)，其功能強大，采用單色器技術(shù)，波長范圍190-1100nm，是各種涉及水和廢水分析領(lǐng)域的通用儀器，應用范圍包括化工分析以及市政和工業(yè)廢水，飲用水，加工過程用水，地表水，冷卻水和鍋爐補給水等液體的分析。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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="教學紫外可見分光光度計對比,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593808795839/2949755.png"></div><p> 根據(jù)吸收光譜圖上的一些特征吸收，特別是MAX吸收波長λmax和摩爾吸收系數(shù)ε，是檢定物質(zhì)的常用物理參數(shù)。 </p> <p> 將分析樣品和標準樣品以相同濃度配制在同一溶劑中，在同一條件下分別測定紫外可見吸收光譜。若兩者是同一物質(zhì)，則兩者的光譜圖應完全一致。如果沒有標樣，也可以和現(xiàn)成的標準譜圖對照進行比較。 </p> <p> 由于紫外吸收光譜只含有2～3個較寬的吸收帶，而紫外光譜主要是分子內(nèi)的發(fā)色團在紫外區(qū)產(chǎn)生的吸收，與分子和其它部分關(guān)系不大。具有相同發(fā)色團的不同分子結(jié)構(gòu)，在較大分子中不影響發(fā)色團的紫外吸收光譜，不同的分子結(jié)構(gòu)有可能有相同的紫外吸收光譜，但它們的吸收系數(shù)是有差別的。如果分析樣品和標準樣品的吸收波長相同，吸收系數(shù)也相同，則可認為分析樣品與標準樣品為同一物質(zhì)。 </p> <p> <span style="display:none;"></span> </p> <p> 紫外吸收光譜能測定化合物中含有微量的具有紫外吸收的雜質(zhì)。如果化合物的紫外可見光區(qū)沒有明顯的吸收峰，而它的雜質(zhì)在紫外區(qū)內(nèi)有較強的吸收峰，就可以檢測出化合物中的雜質(zhì)。 </p> <p> 不同的極性溶劑產(chǎn)生氫鍵的強度也不同，這可以利用紫外光譜來判斷化合物在不同溶劑中氫鍵強度，以確定選擇哪一種溶劑。 </p> <p> 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，我們可以用分光光度法來研究其組成。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。上海紫外可見分光光度計多少錢</p><p style="text-indent:25px">分光光度法可以得出一些化學反應速度常數(shù)，并從兩個或兩個以上溫度條件下得到的速度數(shù)據(jù)，得出反應活化能。教學紫外可見分光光度計對比</p><p> 紫外可見分光光度計條件設(shè)定 </p> <p> 在定量分析中，為了提高測定的靈敏度，入射光的波長應選擇被測物的MAX吸收波長λmax，如果λmax有干擾，可選擇另一條靈敏度稍低、但能避免干擾的譜線，所以，適當選擇入射光的波長，不僅能提高測定的靈敏度，還能提高測定的準確度。 </p> <p> 狹縫寬度過大，入射光的單色性差；狹縫寬度太小，入射光的強減弱。狹縫寬度過大或過小均會造成靈敏度降低，選擇是產(chǎn)生MIN誤差情下的MAX狹縫。一般選用儀器的狹縫寬琶度應小于待測樣品吸收帶的半寬度，否則測得的吸光度值會偏低，狹縫寬度的選擇應以減少狹縫寬度時供試品的吸光度不再；加為準，對于大部分被測品種，可以使用2nm縫寬。 </p> <p> 可通過控制被測物濃度或改變吸收池厚度來實現(xiàn)吸光度合理的范圍，以盡量減小測量誤差。一般吸光度盡量控制在0.1-0.8范圍。 </p> <p> 空白溶液是用來調(diào)節(jié)吸光度測量工作零點即A=0，T=100%的溶液，以消除溶液中其它基體組分以及吸收池和溶劑對入射光的反射和吸收所帶來的誤差。根據(jù)情況不同，常用空白溶液有如下幾種選擇。 </p> <p> <br /> 教學紫外可見分光光度計對比</p><p style="text-indent:25px">上海儀電分析儀器有限公司一直專注于儀器儀表、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)。【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】，是一家儀器儀表的企業(yè)，擁有自己**的技術(shù)體系。公司目前擁有專業(yè)的技術(shù)員工，為員工提供廣闊的發(fā)展平臺與成長空間，為客戶提供高質(zhì)的產(chǎn)品服務(wù)，深受員工與客戶好評。公司業(yè)務(wù)范圍主要包括：分光光度計，氣相色譜，原子吸收，食品安全等。公司奉行顧客至上、質(zhì)量為本的經(jīng)營宗旨，深受客戶好評。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/2042350.html</p></div></div></div></div></div><div id="8k5ap38" class="page-right twoColRt"><div id="8hzvv13" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="qt5te88" class="recomPic likePro"><a 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