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id="psu32by" 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="8kcj22o" 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="xrovr3n" 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>產品關鍵詞：</span>低端紫外可見分光光度計生產廠家,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-04 03:19:35</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="i8ujbiu" 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="2qczbdu" class="page-proshow02"><p class="title">詳細說明</p><div id="okhtqxz" class="box"><p><p> 紫外可見分光光度計的比色皿的洗滌方法 </p> <p> 1分光光度法中比色皿潔凈與否是影響測定準確度的因素之一。因此，必須重視選擇正確的洗凈方法。 </p> <p> 俺的經驗是：要是你測定溶液是酸，如果不干凈，就用弱堿溶液洗，要是你測定溶液是堿，如果不干凈，就用弱酸溶液洗，要是你測定溶液是有機物質，如果不干凈，就用有機溶劑，比如酒精等溶液洗，低端紫外可見分光光度計生產廠家。 </p> <p> 2選擇比色皿洗滌液的原則是去污效果好，不損壞比色皿，同時又不影響測定。 </p> <p> 2.1分析常用的鉻酸洗液不宜用于洗滌比色皿，這是因為帶水的比色皿在該洗液中有時會局部發(fā)熱，致使比色皿膠接面裂開而損壞。同時經洗液洗滌后的比色皿還很可能殘存微量鉻，其在紫外區(qū)有吸收，因此會影響鉻及其他有關元素的測定。 </p> <p> 一般主張使用硝酸和過氧化氫(5：1)的混合溶液泡洗，然后用水沖洗干凈。對一般方法難以洗凈的比色皿，還可以采取以下兩種方法。 </p> <p> 2，低端紫外可見分光光度計生產廠家.2先將比色皿侵入含有少量陰離子表面活性劑的碳酸鈉(20克/升)溶液泡洗，低端紫外可見分光光度計生產廠家，經水沖洗后，再于過氧化氫和硝酸(5：1)混合溶液中侵泡半小時。紫外分光光度計一般覆蓋190nm和380nm波長，通常利用氘燈照明。低端紫外可見分光光度計生產廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="低端紫外可見分光光度計生產廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png"></div><p> 什么是紫外可見分光光度計？紫外可見分光光度計是一類很重要的分析儀器，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)代化生產與管理部門，紫外可見分光光度計都有重要的應用。 </p> <p> 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(Lambert-Beer)定律應用于定量分析化學領域，并且設計了第1臺比色計。到1918年，美國國家標準局制成了第1臺紫外可見分光光度計。此后，紫外可見分光光度計經不斷改進，又出現(xiàn)自動記錄、自動打印、數(shù)字顯示、微機控制等各種類型的儀器，使光度法的靈敏度和準確度也不斷提高，其應用范圍也不斷擴大。紫外可見分光光度法從問世以來，在應用方面有了很大的發(fā)展，尤其是在相關學科發(fā)展的基礎上，促使分光光度計儀器的不斷創(chuàng)新，功能更加齊全，使得光度法的應用更拓寬了范圍。目前，分光光度法已為工農業(yè)各個部門和科學研究的各個領域所采用，成為人們從事生產和科研的有力測試手段。目前市場上有兩類主流產品:掃描光柵式分光光度計和固定光柵式分光光度計。 </p> <p> <br /> 三用紫外可見分光光度計比較紫外可見分光光度計基本工作原理和紅外光譜儀相似，利用一定頻率的紫外可見光照射被分析的有機物質。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="低端紫外可見分光光度計生產廠家,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">紫外可見分光光度計的展望紫外可見分光光度計雖然是一類有著很長歷史的分析儀器，但每一次吸收了新的技術成果都使它煥發(fā)出新的活力。掃描光柵型分光光度計依托成熟的設計制造工藝，并結合計算機控制等新的技術成果，仍有很強的生命力。在很多方面，掃描型產品仍體現(xiàn)了技術水平。陣列式探測器的產生直接促成了固定光柵分光光度計的設計，使得它在測量地更快、更穩(wěn)定、適應性更強的方向邁出了一大步。并且，從今后的發(fā)展來看，儀器的小型化、在線化，測量的現(xiàn)場化、實時化將是一大方向。要使分光光度計走出實驗室，成為一種應用更廣，更為普及的測量分析設備，陣列式探測器以及其它的固態(tài)式設計可發(fā)揮重要的作用。光纖也將是其中的一項重要技術，它已使得紫外可見分光光度計的使用變得更方便，同時也使分光光度計的配置變得更靈活。光纖結合模塊化設計，可能使得分光光度計可以突破完全固定、靜態(tài)的組成，而變成可以自由搭配，自助式構建的儀器。光纖同時也是實現(xiàn)在線測量的重要手段。計算機技術的影響將更為增進。分光光度計的自動化、智能化是一個方面。另一方面，軟件已經在一定程度上使實在的儀器接近了虛擬的程序，網絡和信息技術的結合可能帶來進一步的影響。</p><p style="text-indent:25px">使用紫外可見分光光度計進行定量和定性分析需注意以下一些問題：1吸光度讀數(shù)范圍：吸光度測量誤差在透過率過大或過小時都會變大，為了滿足定量分析的誤差要求（<5%），在定量分析時要求吸光度應在一定的范圍內，這個范圍的具體值與儀器性能有關，主要是與紫外可見分光光度計檢測系統(tǒng)噪聲大小有關，但通常都在0.1~1.0范圍內，如果儀器的檔次更低，則范圍更窄。根據(jù)朗伯比爾定律，影響吸光度大小的因素主要是樣品摩爾吸光系數(shù)，濃度和比色皿光程。實驗中吸光度過大的樣品可通過稀釋樣品使吸光度到所需范圍內。如果樣品不能稀釋，可以改用光程較小的比色皿減小吸光度。吸光度過小的樣品可使用光程較大的比色皿以增大吸光度。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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="低端紫外可見分光光度計生產廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593139440396/4585287.png"></div><p style="text-indent:25px">紫外分光光度計檢測器是將光信號轉變?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度，而是將光強度轉換成電流進行測量，這種光電轉換器件稱為檢測器，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展。在分光光度計的使用或檢定中,透射比(吸光度)的準確度直接關系到所測數(shù)據(jù)的可信性及科學性。廣西紫外可見分光光度計</p><p style="text-indent:25px">實驗室選擇時需要根據(jù)自己實驗室的需要和目的用途來考慮。低端紫外可見分光光度計生產廠家</p><p> 分光光度計作為一種精密儀器，在運行工作過程中由于工作環(huán)境、操作方法等種種原因，其技術狀況必然會發(fā)生某些變化，可能影響設備的性能，甚至誘發(fā)設備故障及事故。因此，分析工作者必須了解分光光度計的基本原理和使用說明，并能及時發(fā)現(xiàn)和排除這些隱患，對已產生的故障及時維修才能保證儀器設備的正常運行。 </p> <p> 若大幅度改變測試波長，需稍等片刻，等燈熱平衡后，重新校正“0”和“100%”點。然后再測量。 </p> <p> 指針式儀器在未接通電源時，電表的指針必須位于零刻度上。若不是這種情況，需進行機械調零。 </p> <p> 比色皿使用完畢后，請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> 操作人員不應輕易動燈泡及反光鏡燈，以免影響光效率。低端紫外可見分光光度計生產廠家</p><p style="text-indent:25px">上海儀電分析儀器有限公司發(fā)展規(guī)模團隊不斷壯大，現(xiàn)有一支專業(yè)技術團隊，各種專業(yè)設備齊全。在儀電分析近多年發(fā)展歷史，公司旗下現(xiàn)有品牌儀電分析,上分等。我公司擁有強大的技術實力，多年來一直專注于儀器儀表、電子元器件及相關的系統(tǒng)集成的生產、服務及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術進出口業(yè)務?！疽婪毥浥鷾实捻椖?，經相關部門批準后方可開展經營活動】儀器儀表、電子元器件及相關的系統(tǒng)集成的生產、服務及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術進出口業(yè)務。【依法須經批準的項目，經相關部門批準后方可開展經營活動】的發(fā)展和創(chuàng)新，打造高指標產品和服務。上海儀電分析儀器有限公司主營業(yè)務涵蓋分光光度計，氣相色譜，原子吸收，食品安全，堅持“質量保證、良好服務、顧客滿意”的質量方針，贏得廣大客戶的支持和信賴。</p></p><br /><p>文章來源地址: 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