中國(guó)紫外可見分光光度計(jì)現(xiàn)貨真誠(chéng)推薦上海儀電分析儀器供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺(tái)【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="可見分光光度計(jì)，紫外分光光度計(jì)和紫外可見分光光度計(jì)有什么區(qū)別?可見分光光度計(jì)和紫外分光光度計(jì)的區(qū)別是測(cè)定波長(zhǎng)范圍不同，一般可見光波長(zhǎng)范圍是400～1000nm,紫外光波長(zhǎng)范圍是200～400nm。所謂紫外可見分光光度計(jì)也就是說這個(gè)儀器可以通"><meta name="keywords" content="中國(guó)紫外可見分光光度計(jì)現(xiàn)貨,紫外可見分光光度計(jì)"><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" 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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>中國(guó)紫外可見分光光度計(jì)現(xiàn)貨,紫外可見分光光度計(jì)</p><p><span>***更新：</span>2020-11-14 02:18:04</p><p><span id="click" >瀏覽次數(shù)：3次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="7tnrhzd" 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(jī): </span>021-34530361</p><p><span>地址: </span>徐塘路88號(hào)7幢4層、9幢</p><p>[當(dāng)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="bd7hvp9" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="bpbft7v" class="box"><p><p> 可見分光光度計(jì)，紫外分光光度計(jì)和紫外可見分光光度計(jì)有什么區(qū)別? </p> <p> 可見分光光度計(jì)和紫外分光光度計(jì)的區(qū)別是測(cè)定波長(zhǎng)范圍不同，一般可見光波長(zhǎng)范圍是400～1000nm,紫外光波長(zhǎng)范圍是200～400nm。所謂紫外可見分光光度計(jì)也就是說這個(gè)儀器可以通過更換光源形成紫外和可見的光區(qū)，能夠測(cè)定吸收峰在紫外和可見光部分的化合物。一般測(cè)定波長(zhǎng)在200～1000nm。 </p> <p> 分光光度計(jì)的關(guān)鍵參數(shù)有哪些? </p> <p> 選擇可見和紫外可見的分光光度計(jì)所關(guān)注的關(guān)鍵的指標(biāo)有三點(diǎn)：一是波長(zhǎng)范圍，二是波長(zhǎng)準(zhǔn)確度，三是雜散光參數(shù)，中國(guó)紫外可見分光光度計(jì)現(xiàn)貨，中國(guó)紫外可見分光光度計(jì)現(xiàn)貨。波長(zhǎng)范圍的選擇是由用戶實(shí)驗(yàn)需要所定，波長(zhǎng)范圍越寬的價(jià)格越貴;波長(zhǎng)準(zhǔn)確度及雜散光參數(shù)的數(shù)值越低，表示性能越好，中國(guó)紫外可見分光光度計(jì)現(xiàn)貨。金屬離子常與有機(jī)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(lái)研究其組成。中國(guó)紫外可見分光光度計(jì)現(xiàn)貨</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中國(guó)紫外可見分光光度計(jì)現(xiàn)貨,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593808795839/2949755.png"></div><p> 如何正確使用752N紫外可見分光光度計(jì) </p> <p> A：在使用紫外可見分光光度計(jì)時(shí)候，設(shè)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(lái)，且在設(shè)備正常運(yùn)轉(zhuǎn)檢查時(shí)候也不能開啟樣品室蓋；在檢查時(shí)候需注意比色皿當(dāng)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(wàn)不能讓液體太多以至于液體外泄直接腐蝕儀器設(shè)備。 </p> <p> 當(dāng)然在進(jìn)行正常檢測(cè)時(shí)候，也要能確保比色皿干凈，當(dāng)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(wàn)不要使用手直接擦拭，以免造成對(duì)手的傷害。 </p> <p> B：在使用紫外可見分光光度計(jì)時(shí)，儀器設(shè)備在正常運(yùn)轉(zhuǎn)的時(shí)候，一定要嚴(yán)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(jìn)行及時(shí)的清潔和處理。 </p> <p> C：當(dāng)使用紫外可見分光光度計(jì)檢測(cè)完畢后，還需要能夠及時(shí)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(shí)將比色皿進(jìn)行倒置晾干處理；全部工作完成后還需把設(shè)備儀器電源給關(guān)閉，再將防潮劑放入到樣品室內(nèi)并做好防塵處理才好。建材紫外可見分光光度計(jì)現(xiàn)貨紫外可見光分光光度計(jì)是使用紫外光譜特點(diǎn)而設(shè)計(jì)制造的光學(xué)儀器。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中國(guó)紫外可見分光光度計(jì)現(xiàn)貨,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png"></div><p> 雜散光：典型值是0.01～0.05%T，在國(guó)外的產(chǎn)品中有65種產(chǎn)品的雜散光指標(biāo)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(xué)設(shè)計(jì)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(jì)少了出射狹縫，實(shí)現(xiàn)低雜散光的難度更大。從性能指標(biāo)來(lái)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(dá)到半數(shù)，但是能夠低于0.01%T的很少。波長(zhǎng)準(zhǔn)確性，國(guó)外的典型水平是0.1～1nm。國(guó)內(nèi)產(chǎn)品中，處于此范圍的有16種，基本達(dá)到同一水平，但沒有優(yōu)于0.1nm的產(chǎn)品。國(guó)內(nèi)產(chǎn)品的光度準(zhǔn)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(zhǔn)確性以吸光度表示，則數(shù)值為0.013～0.021A。與國(guó)外產(chǎn)品有比較明顯的差距。國(guó)內(nèi)產(chǎn)品的光度重復(fù)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(guó)外與國(guó)內(nèi)產(chǎn)品的雜散光的典型值，兩者幾乎相差了一個(gè)數(shù)量級(jí)。但是已有一些較新研發(fā)的產(chǎn)品，可以達(dá)到國(guó)外產(chǎn)品的普遍水準(zhǔn)。 </p><p> 當(dāng)以空白試劑為參比調(diào)節(jié)儀器零點(diǎn)時(shí)，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(cè)離了濃度所決定。此時(shí)吸光度值與試液濃度一般呈線性關(guān)系。吸光度值與測(cè)定濃度不成直線關(guān)系，發(fā)生向下彎曲(負(fù)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(cè)量中能得到充分的光強(qiáng)，儀器必須保持一定的狹縫寬度。由狹縫射出后投射到被測(cè)物質(zhì)上的光，是一個(gè)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(dāng)來(lái)自出射狹縫的光的光譜通帶寬度大于吸收光譜譜帶時(shí)，投射在被測(cè)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(zhǔn)曲線向橫坐標(biāo)軸彎曲而偏離朗伯一比爾定律。實(shí)驗(yàn)室選擇時(shí)需要根據(jù)自己實(shí)驗(yàn)室的需要和目的用途來(lái)考慮。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中國(guó)紫外可見分光光度計(jì)現(xiàn)貨,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png"></div><p> 分光光度計(jì)作為一種精密儀器，在運(yùn)行工作過程中由于工作環(huán)境、操作方法等種種原因，其技術(shù)狀況必然會(huì)發(fā)生某些變化，可能影響設(shè)備的性能，甚至誘發(fā)設(shè)備故障及事故。因此，分析工作者必須了解分光光度計(jì)的基本原理和使用說明，并能及時(shí)發(fā)現(xiàn)和排除這些隱患，對(duì)已產(chǎn)生的故障及時(shí)維修才能保證儀器設(shè)備的正常運(yùn)行。 </p> <p> 若大幅度改變測(cè)試波長(zhǎng)，需稍等片刻，等燈熱平衡后，重新校正“0”和“100%”點(diǎn)。然后再測(cè)量。 </p> <p> 指針式儀器在未接通電源時(shí)，電表的指針必須位于零刻度上。若不是這種情況，需進(jìn)行機(jī)械調(diào)零。 </p> <p> 比色皿使用完畢后，請(qǐng)立即用蒸餾水沖洗干凈，并用干凈柔軟的紗布將水跡擦去，以防止表面光潔度被破壞，影響比色皿的透光率。 </p> <p> 操作人員不應(yīng)輕易動(dòng)燈泡及反光鏡燈，以免影響光效率。一般來(lái)說，紫外光分光光度計(jì)分為單光束和雙光束兩類。高效紫外可見分光光度計(jì)多少錢</p><p style="text-indent:25px">紫外分光光度計(jì)可用于藥品的鑒別、純度檢查及含量測(cè)定，既可以定性分析，又可以定量分析。中國(guó)紫外可見分光光度計(jì)現(xiàn)貨</p><p> 紫外可見分光光度計(jì)種類及優(yōu)缺點(diǎn)對(duì)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(cè)器檢測(cè)。 </p> <p> 缺點(diǎn)：測(cè)完空白再測(cè)試樣品，全波段分析時(shí)間較長(zhǎng)（一般2min）。2比例雙光束UV：?jiǎn)喂庠磫喂馐?，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(jìn)入光電倍增管檢測(cè)器，通過差減法計(jì)算結(jié)果。 </p> <p> 好處：空白樣品同時(shí)檢測(cè)。 </p> <p> 缺點(diǎn)：靈敏度下降，全波段分析時(shí)間較長(zhǎng)。3雙光束UV：?jiǎn)喂庠磫喂馐堂荛]，通過棱鏡分出兩道光，分別通過一光柵，分別進(jìn)入各自的光點(diǎn)倍增管檢測(cè)器。 </p> <p> 好處：加強(qiáng)靈敏度，同時(shí)測(cè)量空白與樣品。 </p> <p> 缺點(diǎn)：全波段分析時(shí)間較長(zhǎng)。4全波段UV：?jiǎn)喂庠磫喂馐?，樣品與空白暴露在空氣中，照射樣品，開始進(jìn)入密閉箱，通過光柵，進(jìn)入DAD檢測(cè)器。 </p> <p> 好處：空白只需要檢測(cè)一次，如果你愿意一輩子檢測(cè)這一次都可以。檢測(cè)樣品不密閉，外界光線對(duì)其無(wú)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(diǎn)：貴。（25W）中國(guó)紫外可見分光光度計(jì)現(xiàn)貨</p><p style="text-indent:25px">上海儀電分析儀器有限公司擁有儀器儀表、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(jì)算機(jī)軟件開發(fā)及銷售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)?！疽婪毥?jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營(yíng)活動(dòng)】?jī)x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(jì)算機(jī)軟件開發(fā)及銷售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)。【依法須經(jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營(yíng)活動(dòng)】等多項(xiàng)業(yè)務(wù)，主營(yíng)業(yè)務(wù)涵蓋分光光度計(jì)，氣相色譜，原子吸收，食品安全。目前我公司在職員工以90后為主，是一個(gè)有活力有能力有創(chuàng)新精神的團(tuán)隊(duì)。誠(chéng)實(shí)、守信是對(duì)企業(yè)的經(jīng)營(yíng)要求，也是我們做人的基本準(zhǔn)則。公司致力于打造***的分光光度計(jì)，氣相色譜，原子吸收，食品安全。一直以來(lái)公司堅(jiān)持以客戶為中心、分光光度計(jì)，氣相色譜，原子吸收，食品安全市場(chǎng)為導(dǎo)向，重信譽(yù)，保質(zhì)量，想客戶之所想，急用戶之所急，全力以赴滿足客戶的一切需要。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/1979395.html</p></div></div></div></div></div><div id="pb9jftx" class="page-right twoColRt"><div id="bxtxtnr" class="box01 margin10 clearfix"><h3><a 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