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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="f335flt" 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="7vbrhft" 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>國內**紫外可見分光光度計對比,紫外可見分光光度計</p><p><span>***更新：</span>2020-10-31 00:30:50</p><p><span id="click" >瀏覽次數(shù)：6次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="nlhp3dl" 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="ltj3h75" class="page-proshow02"><p class="title">詳細說明</p><div id="tzfdlj5" class="box"><p><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，國內**紫外可見分光光度計對比，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，國內**紫外可見分光光度計對比，目前中、高性能分光光度計中一般采用它作為檢測器，國內**紫外可見分光光度計對比。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。為了選擇合適的狹縫寬度，應以減少狹縫寬度時紫外分光光度計試樣的吸光度不再增加為準。國內**紫外可見分光光度計對比</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國內**紫外可見分光光度計對比,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png"></div><p> 紫外可見分光光度計的特點分光光度法對于分析人員來說，可以說是常用和有效的工具之一。幾乎每一個分析實驗室都離不開紫外可見分光光度計。分光光度法具有以下主要特點。 </p> <p> 1靈敏度高 </p> <p> 由于新的顯色劑的大量合成，并在應用研究方面取得了可喜的進展，使得對元素測定的靈敏度有所推進，特別是有關多元絡合物和各種表面活性劑的應用研究，使許多元素的摩爾吸光系數(shù)由原來的幾萬提高到數(shù)十萬。 </p> <p> 2選擇性好 </p> <p> 目前已有些元素只要利用控制適當?shù)娘@色條件就可直接進行光度法測定，如鈷、鈾、鎳、銅、銀、鐵等元素的測定，已有比較滿意的方法了。 </p> <p> 3準確度高 </p> <p> 對于一般的分光光度法，其濃度測量的相對誤差在1～3%范圍內，如采用示差分光光度法進行測量，則誤差可減少到0.X%。 </p> <p> 4適用濃度范圍廣 </p> <p> 可從常量(1%～50%)(尤其使用示差法)到痕量(10-8～10-6%)(經預富集后)。 </p> <p> 5分析成本低、操作簡便、快速、應用廣 </p> <p> 由于各種各樣的無機物和有機物在紫外可見區(qū)都有吸收，因此均可借此法加以測定。到目前為止，幾乎化學元素周期表上的所有元素(除少數(shù)放射性元素和惰性元素之外)均可采用此法。在國際上發(fā)表的有關分析的論文總數(shù)中，光度法約占28%，我國約占所發(fā)表論文總數(shù)的33%。國內紫外可見分光光度計銷售廠家紫外分光光度計（UV Spectrophotometer）在實驗室長期在分析領域扮演很重要的角色。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國內**紫外可見分光光度計對比,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png"></div><p> 當以空白試劑為參比調節(jié)儀器零點時，比色皿窗材料的吸收、內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系。吸光度值與測定濃度不成直線關系，發(fā)生向下彎曲(負偏離)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，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，且能使校準曲線向橫坐標軸彎曲而偏離朗伯一比爾定律。 </p><p> 光學構造（OPTICAL CONFIGURATION）一般來說，紫外光分光光度計分為單光束和雙光束兩類。顧名思義，單光束型主要是依賴單束光進行測量。一束給定波長的光通過對照物，然后再通過實際樣品溶液，就能得到吸光結果。 </p> <p> 雙光束型則是通過一個斬光輪（mirrored chopper wheel）將一束光分成兩束，分別測量對照樣品和實際樣品。可MIN光漂移（lamp drift）和減少測量時間。一些雙光型光度計不利用斬光輪，而是利用一種光束分光器來代替，將一束光分成兩束平行的光然后同時測量對照樣品和目的樣品。因為增加了測量的速度，所以雙光束分光光度計在測量一些溶液隨時間動態(tài)變化的研究中大有用處。紫外可見分光光度計主要由光源系統(tǒng)、單色器系統(tǒng)、樣品室、檢測系統(tǒng)組成。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國內**紫外可見分光光度計對比,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png"></div><p> 進行單波長測量時，需要考慮朗伯比爾定律對入射光單色性的要求和測定靈敏度的要求。沒有干擾時，一般選擇在吸收峰的MAX吸收波長位置處，如果有干擾，選擇在沒有干擾且吸光度變化較平緩的位置。進行多波長校正時，除盡量滿足單波長測定的波長要求外，還要求多個組分間的吸收光譜間線性無關。 </p> <p> 紫外分光光度計狹縫的大小會影響到儀器的信噪比和標準曲線的線性范圍。狹縫過大，通常會使線性范圍變小，特別是當不在MAX吸收波長位置測定時更是如此。狹縫過小，信噪比變差，基線平直度和測量數(shù)據(jù)的重復性會變差。此外，還需要考慮樣品吸收峰寬度的影響。通常單波長測定時，一般選擇在MAX吸收波長位置，線性范圍容易滿足，可選擇較寬的狹縫（1~2nm）多波長測定時，很難同時在所有波長都滿足線性范圍要求，應選擇比較小的狹縫。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。國內**紫外可見分光光度計對比</p><p style="text-indent:25px">在大部分的樣品類型中，分光光度計可接受樣品孔、小玻璃管cuvette、吸漿管和微孔板。國內**紫外可見分光光度計對比</p><p> 雜散光：典型值是0.01～0.05%T，在國外的產品中有65種產品的雜散光指標在這一范圍中。雜散光超過0.05%T的產品有31種，小于0.01%T的產品有19種。。從其光學設計看，都采用了雙單色器。與掃描光柵型產品相比，固定光柵的分光光度計少了出射狹縫，實現(xiàn)低雜散光的難度更大。從性能指標來看，范圍是0.01～1%T。26種固定光柵型產品中雜散光在0.01～0.05%T之間的有13種，也已達到半數(shù)，但是能夠低于0.01%T的很少。波長準確性，國外的典型水平是0.1～1nm。國內產品中，處于此范圍的有16種，基本達到同一水平，但沒有優(yōu)于0.1nm的產品。國內產品的光度準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，將光度準確性以吸光度表示，則數(shù)值為0.013～0.021A。與國外產品有比較明顯的差距。國內產品的光度重復性基本在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。比較國外與國內產品的雜散光的典型值，兩者幾乎相差了一個數(shù)量級。但是已有一些較新研發(fā)的產品，可以達到國外產品的普遍水準。國內**紫外可見分光光度計對比</p><p style="text-indent:25px">上海儀電分析儀器有限公司是一家生產型類企業(yè)，積極探索行業(yè)發(fā)展，努力實現(xiàn)產品創(chuàng)新。公司致力于為客戶提供安全、質量有保證的良好產品及服務，是一家有限責任公司企業(yè)。公司擁有專業(yè)的技術團隊，具有分光光度計，氣相色譜，原子吸收，食品安全等多項業(yè)務。儀電分析以創(chuàng)造***產品及服務的理念，打造高指標的服務，引導行業(yè)的發(fā)展。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1777664.html</p></div></div></div></div></div><div id="xtbrp3r" class="page-right twoColRt"><div id="5thpnlj" class="box01 margin10 clearfix"><h3><a 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