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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>?高效紫外可見分光光度計單價誠信互利上海儀電分析儀器供應</p><div id="323jasu" class="leftbox clearfix"><h1>高效紫外可見分光光度計單價誠信互利上海儀電分析儀器供應</h1><div id="vebd83l" class="proBig"><div id="39gsmt3" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="o3hjwtk" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="ar3c2kb" 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>高效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>2020-11-11 07:23:25</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="7ajfmoq" 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="a7fcegi" class="page-proshow02"><p class="title">詳細說明</p><div id="8pbtkhj" class="box"><p><p style="text-indent:25px">關于波長準確度的檢查與校正日常在使用分光光度計時，是否要經(jīng)常進行儀器波長準確度的檢查?答案是否定的。當在日常測定中發(fā)現(xiàn)儀器測定靈敏度下降，這時才應進行波長準確度的檢查，簡易的檢查方法(粗檢)是：儀器開機后，調節(jié)波長為580nm，在吸收池座的通光道中插入一張白色卡片紙，若能觀察到一長方形的黃色光斑，說明波長準確度屬正常范圍，否則就應進行波長校正。當儀器經(jīng)過長途搬運、受過機械振動或更換光源燈泡后，必須進行波長準確度的檢查與校正，高效紫外可見分光光度計單價。粗檢同上，其校正方法有：干涉濾光片或鐠釹濾光片校正法，高效紫外可見分光光度計單價、利用氘燈的特征發(fā)射線校正法。具體步驟可參考儀器使用說明書，高效紫外可見分光光度計單價。在水質的常規(guī)監(jiān)測中，紫外可見分光光度法占有較大的比重，待測物的濃度和干擾物的濃度差別很大。高效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="高效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/ydfx123/637396593771266494/7369055.png"></div><p> 色譜技術比它起步晚了二百多年，但如今的色譜儀器（氣相、液相、氣質、液質）占了分析界的大半壁江山。相較璀璨如星的各類的色譜儀器，紫外-可見分光光度計黯然了很多。 </p> <p> 紫外-可見分光光度計可以被更精確更高級的檢測手段所取代？可以退出“分析史”的舞臺？ </p> <p> NO！NO！NO！ </p> <p> 事實上紫外-可見分光光度計（下文簡稱紫外分光光度計），依然是“分析舞臺”的美玉，低調有內涵，親民有價值。一起來發(fā)現(xiàn)它在日化產(chǎn)品分析中的美和價值吧。原理分子的紫外可見吸收光譜是由于分子中的某些基團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。由于各種物質具有各自不同的分子、原子和分子空間結構，其吸收光能量的情況也就不會相同，因此，每種物質都有其特有的、固定的吸收光譜曲線，可根據(jù)吸收光譜上某些特征波長處吸光度的高低判別或測定該物質的含量，這就是分光光度定性和定量分析的基礎。飼料紫外可見分光光度計代理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="高效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> 紫外可見分光光度計種類及優(yōu)缺點對比 </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)測器檢測。 </p> <p> 缺點：測完空白再測試樣品，全波段分析時間較長（一般2min）。2比例雙光束UV：單光源單光束，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，進入光電倍增管檢測器，通過差減法計算結果。 </p> <p> 好處：空白樣品同時檢測。 </p> <p> 缺點：靈敏度下降，全波段分析時間較長。3雙光束UV：單光源單光束，全程密閉，通過棱鏡分出兩道光，分別通過一光柵，分別進入各自的光點倍增管檢測器。 </p> <p> 好處：加強靈敏度，同時測量空白與樣品。 </p> <p> 缺點：全波段分析時間較長。4全波段UV：單光源單光束，樣品與空白暴露在空氣中，照射樣品，開始進入密閉箱，通過光柵，進入DAD檢測器。 </p> <p> 好處：空白只需要檢測一次，如果你愿意一輩子檢測這一次都可以。檢測樣品不密閉，外界光線對其無影響，使用方便且精確。分析任何波段或全波段不到1s。 </p> <p> 缺點：貴。（25W） </p><p> 紫外可見分光光度計是一類很重要的實驗室分析儀器，無論在物理學、化學、生物學、醫(yī)學、材料學、環(huán)境科學等科學研究領域，還是在化工、醫(yī)藥、環(huán)境檢測、冶金等現(xiàn)代化生產(chǎn)與管理部門，紫外可見分光光度計都有面向廣的應用。 </p> <p> 紫外可見分光光度計校正 </p> <p> 開機預熱10分鐘足矣； </p> <p> 放入黑塊和標樣（沒有的自己配），關閉蓋子； </p> <p> 校0； </p> <p> 把燈光對著黑塊，把透光度調0； </p> <p> 把燈光對標樣，將吸光度調到100%。 </p> <p> 紫外可見分光光度計使用注意事項 </p> <p> 開機前應先預熱15分鐘，然后開機自檢； </p> <p> 濕度要控制在75%左右，溫度在5～30度之間； </p> <p> 儀器要穩(wěn)壓電源，接地要好。并且避免陽光直接照射。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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="高效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/ydfx123/637396593808795839/2949755.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。實驗室研究人員希望省錢購入專門儀器定量核酸、蛋白或者細菌的生長情況。直讀紫外可見分光光度計現(xiàn)貨</p><p style="text-indent:25px">按所吸收光的波長區(qū)域不同，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。高效紫外可見分光光度計單價</p><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，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系不大。具有相同發(fā)色團的不同分子結構，在較大分子中不影響發(fā)色團的紫外吸收光譜，不同的分子結構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。 </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。如果化合物的紫外可見光區(qū)沒有明顯的吸收峰，而它的雜質在紫外區(qū)內有較強的吸收峰，就可以檢測出化合物中的雜質。 </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合物，多數(shù)絡合物在紫外可見區(qū)是有吸收的，我們可以用分光光度法來研究其組成。高效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。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/1943526.html</p></div></div></div></div></div><div id="tvx2ugx" class="page-right twoColRt"><div id="d8tqszl" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="m9pb7xz" 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 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