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href="http://www.cdcfah.com/cp/third-gxyq_gpygdj/">光譜儀、光度計</a>?上海**紫外可見分光光度計銷售廠家服務(wù)為先上海儀電分析儀器供應(yīng)</p><div id="mkb3wp8" class="leftbox clearfix"><h1>上海**紫外可見分光光度計銷售廠家服務(wù)為先上海儀電分析儀器供應(yīng)</h1><div id="g7b8l7l" class="proBig"><div id="hfwneny" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="cpfb7aj" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="zxtf3k3" 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>上海**紫外可見分光光度計銷售廠家,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-08 02:19:06</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="ax7x3qe" 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="xawsoaw" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="yri88ar" class="box"><p><p> 紫外-可見分光光度計（UV）引用新型技術(shù)，其功能強(qiáng)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(yīng)用范圍包括市政和工業(yè)廢水，飲用水，加工過程用水，地表水，冷卻水和鍋爐補(bǔ)給水等。 </p> <p> 在水和廢水監(jiān)測中的應(yīng)用，對于一個水系的監(jiān)測分析和綜合評價，一般包括水相（溶液本身）、固相（懸浮物、底質(zhì)）、生物相（水生生物）。在水質(zhì)的常規(guī)監(jiān)測中，紫外可見分光光度法占有較大的比重。由于水和廢水的成分復(fù)雜多變，待測物的濃度和干擾物的濃度差別很大，在具體分析時必須選擇好分析方法。 </p> <p> 在農(nóng)產(chǎn)品和食品分析中可用于檢測的組分或成分有蛋白質(zhì)、賴氨酸、葡萄糖、維生素C、硝酸鹽、亞硝酸鹽、砷、汞等; </p> <p> 在植物生化分析中可用于檢測葉綠素、全氮和酶的活力等； </p> <p> 在飼料分析中可用于檢測煙酸、棉酚，上海**紫外可見分光光度計銷售廠家、磷化氫和甲酯等。原理紫外可見吸收光譜主要產(chǎn)生于分子價電子在能級間的躍遷。利用一定頻率的紫外--可見光照射被分析的物質(zhì)，引起分子中價電子的躍遷，它將有選擇地被吸收。吸收光譜可以反映出物質(zhì)的特征。它對物質(zhì)進(jìn)行定性分析、定量分析及結(jié)構(gòu)分析，上海**紫外可見分光光度計銷售廠家,所依據(jù)的光譜是分子或離子吸收入射光中特定波長的光而產(chǎn)生的吸收光譜，上海**紫外可見分光光度計銷售廠家。紫外光分光光度計分為單光束和雙光束兩類。單光束型主要是依賴單束光進(jìn)行測量。上海**紫外可見分光光度計銷售廠家</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銷售廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png"></div><p> 分光光度計的帶寬（bandwidth）很大程度上依賴于單色儀的狹縫的寬度。可以投射出實驗精確要求的光譜。一種嚴(yán)格帶寬使得儀器能對復(fù)雜的混合物進(jìn)行高分辨率的吸光測量?？勺兊膯紊珒x的狹縫寬度能使一臺分光光度計滿足多種實驗需要。 </p> <p> 為了測量吸光值，分光光度計制造商通常使用光電倍增管（photo-multipliertubes，PMTs）和光敏二極管。PMTs提供快速的反應(yīng)時間和良好的靈敏度，并且可以在紫外光譜調(diào)節(jié)至特定的范圍。但一些制造商依賴于光敏二極管的動態(tài)范圍在數(shù)秒內(nèi)行使所有的光譜測量。上海**紫外可見分光光度計銷售廠家傳統(tǒng)單光束UV紫外測試，測試過程全程封閉，單光束光源只通過光柵直接照射樣品，再經(jīng)光電倍增管檢測器檢測。</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銷售廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png"></div><p style="text-indent:25px"><p>綜合評價紫外可見光分光光度計儀器：根據(jù)使用領(lǐng)域進(jìn)行初步篩選，科研、制藥領(lǐng)域注重選擇光譜可調(diào)的紫外可見光分光光度計。其中，制藥中藥檢儀器要符合藥典規(guī)定，光譜帶寬要求為2nm以下。<p>重要性能指標(biāo)的考察，包括：光度準(zhǔn)確度，雜散光，光譜帶寬，穩(wěn)定性，噪聲，波長的準(zhǔn)確度和重復(fù)性是幾個重要指標(biāo)。各指標(biāo)間相互獨立有相互影響，需要綜合考量選購目標(biāo)紫外可見光分光光度計。<p>使用前，閱讀儀器使用說明書和做好儀器使用前的工程師培訓(xùn)。使用過程中，正確操作、認(rèn)真了解儀器指標(biāo)的物理意義和測試方法以及結(jié)合儀器使用中的相關(guān)設(shè)備的調(diào)試。掌握儀器的基本保養(yǎng)維護(hù)知識，建立相關(guān)指標(biāo)與分析測試結(jié)果之間的誤差影響條件，經(jīng)常檢測和調(diào)試儀器，確保儀器處在合適的工作狀態(tài)。</p><p style="text-indent:25px">紫外分光光度計檢測器是將光信號轉(zhuǎn)變?yōu)殡娦盘柕难b置。測量吸光度時，并非直接測量透過吸收池的光強(qiáng)度，而是將光強(qiáng)度轉(zhuǎn)換成電流進(jìn)行測量，這種光電轉(zhuǎn)換器件稱為檢測器，又叫接受器。常用的檢測器有光電池、光電管、光電倍增管及光電二極管陣列檢測器等。光電池價格便宜，但長時間曝光，會使靈敏度降低。光電管的靈敏度比光電池高；光電倍增管不僅靈敏度比普通光電管高，而且響應(yīng)速度快，目前中、高性能分光光度計中一般采用它作為檢測器。光電二極管陣列檢測器是紫外可見分光光度計檢測的一個重要進(jìn)展。分光光度法可以得出一些化學(xué)反應(yīng)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(yīng)活化能。</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銷售廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593808795839/2949755.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(biāo)樣品，引起目標(biāo)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，因此，可進(jìn)行光譜的定性分析。且根據(jù)吸收與已知濃度標(biāo)樣比較，能進(jìn)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(jī)型：單光束UV、全程密閉、以光柵進(jìn)行分光，標(biāo)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(biāo)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。紫外可見吸收光譜是由于分子中的某些基團(tuán)吸收了紫外可見輻射光后，發(fā)生了電子能級躍遷而產(chǎn)生的吸收光譜。中國紫外可見分光光度計銷售廠家</p><p style="text-indent:25px">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。上海**紫外可見分光光度計銷售廠家</p><p> 當(dāng)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(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(dāng)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(zhǔn)曲線向橫坐標(biāo)軸彎曲而偏離朗伯一比爾定律。上海**紫外可見分光光度計銷售廠家</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，交通便利，環(huán)境優(yōu)美，是一家生產(chǎn)型企業(yè)。公司致力于為客戶提供安全、質(zhì)量有保證的良好產(chǎn)品及服務(wù)，是一家有限責(zé)任公司企業(yè)。公司始終堅持客戶需求優(yōu)先的原則，致力于提供高質(zhì)量的分光光度計，氣相色譜，原子吸收，食品安全。儀電分析將以真誠的服務(wù)、創(chuàng)新的理念、***的產(chǎn)品，為彼此贏得全新的未來！</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1893949.html</p></div></div></div></div></div><div id="jhyuvms" class="page-right twoColRt"><div id="wuqhdu3" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="kdeghso" 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(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)</p></a></div><div id="g7zdyuv" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/846569.html"><div><img 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