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clearfix"><h1>中國**紫外可見分光光度計真誠推薦上海儀電分析儀器供應</h1><div id="twg8bda" class="proBig"><div id="l32vqhz" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="peb3mj8" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="pq3lyfb" class="content"><p><span>需求數量：</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>中國**紫外可見分光光度計,紫外可見分光光度計</p><p><span>***更新：</span>2020-10-31 09:23:31</p><p><span id="click" >瀏覽次數：0次</span></p><a rel="nofollow" class="button">聯系我們</a></div></div><div id="lyvp78d" 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="mzwy3yk" class="page-proshow02"><p class="title">詳細說明</p><div id="hp87l3b" class="box"><p><p> 紫外分光光度計的單色器是將光源發(fā)出的連續(xù)光譜分解成單色光，并能準確方便地“取出”所需要的某一波長的光的光學裝置，它是光度計的心臟。單色器主要由狹縫、色散元件和透鏡系統組成。其中色散元件是單色器的主要部件。常用的色散元件是棱鏡、光柵，或者是兩者的組合。 </p> <p> 棱鏡單色器是利用不同波長的光在棱鏡內折射率不同將復合光色散為單色光，這種現象稱為棱鏡的色散作用。常用的棱鏡由玻璃或石英制成，中國**紫外可見分光光度計?？梢姽夥秶２捎貌ＡЮ忡R，其色散力強，價格低廉，但是玻璃吸收紫外光，所以不宜用于紫外光區(qū)。紫外光范圍常用石英作為材料，石英棱鏡的工作波長范圍為185~4000nm，在紫外光區(qū)有較好的分辨力，而且也適用于可見光區(qū)和近紅外光區(qū)。棱鏡單色器的特點是波長越短，色散程度越好。越趨向長波，色散程度越差，所以，單色器用棱鏡的分光光度計，中國**紫外可見分光光度計，其波長刻度在紫外光區(qū)可達到0.2nm，中國**紫外可見分光光度計，而在長波段，只能達到5nm。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-multiplier tubes，PMTs）和光敏二極管。中國**紫外可見分光光度計</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中國**紫外可見分光光度計,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.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。甲醛紫外可見分光光度計怎么樣紫外分光光度計一般覆蓋190nm和380nm波長，通常利用氘燈照明。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中國**紫外可見分光光度計,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png"></div><p style="text-indent:25px"><p>綜合評價紫外可見光分光光度計儀器：根據使用領域進行初步篩選，科研、制藥領域注重選擇光譜可調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>重要性能指標的考察，包括：光度準確度，雜散光，光譜帶寬，穩(wěn)定性，噪聲，波長的準確度和重復性是幾個重要指標。各指標間相互獨立有相互影響，需要綜合考量選購目標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。使用過程中，正確操作、認真了解儀器指標的物理意義和測試方法以及結合儀器使用中的相關設備的調試。掌握儀器的基本保養(yǎng)維護知識，建立相關指標與分析測試結果之間的誤差影響條件，經常檢測和調試儀器，確保儀器處在合適的工作狀態(tài)。</p><p> 紫外可見分光光度計的發(fā)展分光光度法在分析領域中的應用已經有數十年的歷史，至今仍是應用常用的分析方法之一。隨著分光元器件及分光技術、檢測器件與檢測技術、大規(guī)模集成制造技術等的發(fā)展，以及單片機、微處理器、計算機和DSP技術的應用，分光光度計的性能指標不斷提高，并向自動化、智能化、高速化和小型化等方向發(fā)展。 </p> <p> 在分光元器件方面，經歷了棱鏡、機刻光柵和全息光柵的過程，商品化的全息閃耀光柵已迅速取代一般刻劃光柵。在儀器控制方面，隨著單片機、微處理器的出現以及軟硬件技術的結合，從早期的人工控制進步到了自動控制。在顯示、記錄與繪圖方面，早期采用表頭(電位計)指示、繪圖儀繪圖，后來用數字電壓表數字顯示，如今更多地采用液晶屏幕或計算機屏幕顯示。在檢測器方面，早期使用光電池、光電管，后來更普遍地使用光電倍增管甚至光電二極管陣列。陣列型檢測器和凹面光柵的聯合應用，使儀器的測量速度發(fā)生了質的飛躍，且性能更加穩(wěn)定可靠，受到儀器用戶的青睞，在儀器構型方面，從單光束發(fā)展為雙光束，現在幾乎所有高級分光光度計都是雙光束的，有些高精度的儀器采用雙單色器。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據的可信性及科學性。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中國**紫外可見分光光度計,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png"></div><p> 根據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ε，是檢定物質的常用物理參數。 </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。紫外可見分光光度計應安裝在太陽不能直接曬到的地方，以免“室光” 太強，影響儀器的使用壽命。甲醛紫外可見分光光度計多少錢</p><p style="text-indent:25px">紫外-可見分光光度法是利用某些物質的分子吸收200--800nm光譜區(qū)的輻射來進行分析測定的方法。中國**紫外可見分光光度計</p><p> 關于吸光度測定重復性的問題分光光度計在測定過程中，發(fā)現同一個溶液在不同時問里其測定結果不同，即重復性不好，其原因是什么?排除測定錯誤因素外，可能原因有：(1)儀器預熱時間不夠或預熱方法不對所造成，應延長預熱時間或采用正確的預熱方法。 </p> <p> (2)光電轉換器(如光電管)因長時間使用其光電轉換效率發(fā)生了變化導致。這時標準溶液與待測溶液的吸光度都同樣變低，在相對定量時對結果影響很小。但是對這類儀器，一般建議連續(xù)使用時間不應超過3h，若需長時間使用，間歇30min。中國**紫外可見分光光度計</p><p style="text-indent:25px">上海儀電分析儀器有限公司主營品牌有儀電分析,上分，發(fā)展規(guī)模團隊不斷壯大，該公司生產型的公司。公司是一家有限責任公司企業(yè)，以誠信務實的創(chuàng)業(yè)精神、專業(yè)的管理團隊、踏實的職工隊伍，努力為廣大用戶提供***的產品。公司始終堅持客戶需求優(yōu)先的原則，致力于提供高質量的分光光度計，氣相色譜，原子吸收，食品安全。儀電分析自成立以來，一直堅持走正規(guī)化、專業(yè)化路線，得到了廣大客戶及社會各界的普遍認可與大力支持。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1787891.html</p></div></div></div></div></div><div id="ltgnubd" class="page-right twoColRt"><div id="diacjl3" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="p3rtlip" 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" 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