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clearfix"><h1>水質(zhì)紫外可見分光光度計選擇推薦咨詢上海儀電分析儀器供應(yīng)</h1><div id="ygpb2xe" class="proBig"><div id="tg87t32" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="wxbi2gm" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="uhzbym4" 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>水質(zhì)紫外可見分光光度計選擇,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-25 17:45:22</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="ea2btsr" 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(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="9bby88s" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="ftfcoap" class="box"><p><p> 雙光束UV：經(jīng)棱鏡分光后通過光柵，加強了靈敏度，同時測量空白樣品與目標(biāo)樣品的優(yōu)點，全波段分析時間長。全波段UV：樣品與空白樣品可以暴露在空氣中，照射樣品后，進入密閉箱，通過光柵，進入DAD檢測器檢測。檢測樣品不需要密閉，外界光線對測試無影響，使用方便準(zhǔn)確且空白只需要檢測一次，全波段分析時間小于1s。 </p> <p> 紫外可見光分光光度計的體積大小以及外觀美學(xué)性。紫外可見分光光度計的儀器體積大小，會牽扯儀器所需要的擺放位置以及儀器使用的方便程度。 </p> <p> 儀器的外形美觀，給人以大氣、上檔次、舒適、新鮮的感覺。首先，會讓使用儀器者對儀器分外的愛護、維護和保養(yǎng)，有利于延長儀器的使用壽命。同時，也會讓儀器使用者的工作環(huán)境更舒適、優(yōu)美，也有利于提高工作效率。 </p> <p> 紫外可見光分光光度計儀器使用范圍。紫外可見光分光光度的使用范圍是有儀器的性能指標(biāo)所決定。采購紫外可見光分光光度計根據(jù)測試樣品的具體要求，水質(zhì)紫外可見分光光度計選擇，參考儀器的使用范圍，滿足即可，不必苛求。當(dāng)然，水質(zhì)紫外可見分光光度計選擇，土豪可以忽略，水質(zhì)紫外可見分光光度計選擇。初次使用紫外可見分光光度計的人員，一般來說，一定要詳細(xì)閱讀儀器安全操作手冊。水質(zhì)紫外可見分光光度計選擇</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="水質(zhì)紫外可見分光光度計選擇,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png"></div><p> 可見分光光度計，紫外分光光度計和紫外可見分光光度計有什么區(qū)別? </p> <p> 可見分光光度計和紫外分光光度計的區(qū)別是測定波長范圍不同，一般可見光波長范圍是400～1000nm,紫外光波長范圍是200～400nm。所謂紫外可見分光光度計也就是說這個儀器可以通過更換光源形成紫外和可見的光區(qū)，能夠測定吸收峰在紫外和可見光部分的化合物。一般測定波長在200～1000nm。 </p> <p> 分光光度計的關(guān)鍵參數(shù)有哪些? </p> <p> 選擇可見和紫外可見的分光光度計所關(guān)注的關(guān)鍵的指標(biāo)有三點：一是波長范圍，二是波長準(zhǔn)確度，三是雜散光參數(shù)。波長范圍的選擇是由用戶實驗需要所定，波長范圍越寬的價格越貴;波長準(zhǔn)確度及雜散光參數(shù)的數(shù)值越低，表示性能越好。化工紫外可見分光光度計差價測量吸光度并不是測量透過吸收池的光強度，而是將光強度轉(zhuǎn)換成電流進行測量，稱為紫外分光光度計的檢測器。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="水質(zhì)紫外可見分光光度計選擇,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png"></div><p style="text-indent:25px"><p>紫外可見分光光度計定量、定性分析需注意的問題<p>重復(fù)測定次數(shù)和波長掃描速度：對吸光度不是很大的樣品，或者狹縫不是很小，這是檢測器檢測的光信號的強度是比較大的，重復(fù)性較好，可選擇較少的重復(fù)次數(shù)。相反，如果樣品吸光度很大，狹縫很小，選擇較大的重復(fù)次數(shù)可獲得更好的結(jié)果。5測定波長間隔：在掃描光譜時需要選擇，可根據(jù)樣品吸收峰的寬度進行選擇，峰寬較大時，可選擇較大的波長間隔。反之亦反。通常每個正常的吸收峰應(yīng)該用不少于30個數(shù)據(jù)點表示出來。</p><p> 關(guān)于吸光度測定重復(fù)性的問題分光光度計在測定過程中，發(fā)現(xiàn)同一個溶液在不同時問里其測定結(jié)果不同，即重復(fù)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(yù)熱時間不夠或預(yù)熱方法不對所造成，應(yīng)延長預(yù)熱時間或采用正確的預(yù)熱方法。 </p> <p> (2)光電轉(zhuǎn)換器(如光電管)因長時間使用其光電轉(zhuǎn)換效率發(fā)生了變化導(dǎo)致。這時標(biāo)準(zhǔn)溶液與待測溶液的吸光度都同樣變低，在相對定量時對結(jié)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(yīng)超過3h，若需長時間使用，間歇30min。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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="水質(zhì)紫外可見分光光度計選擇,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><p> 紫外-可見分光光度計（UV）引用新型技術(shù)，其功能強大，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、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)進行定性分析、定量分析及結(jié)構(gòu)分析,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。紫外分光光度法是根據(jù)物質(zhì)的吸收光譜，來研究物質(zhì)的成分、結(jié)構(gòu)和物質(zhì)間相互作用的有效手段?；ぷ贤饪梢姺止夤舛扔媽Ρ?/p><p style="text-indent:25px">紫外分光光度計一般覆蓋190nm和380nm波長，通常利用氘燈照明。水質(zhì)紫外可見分光光度計選擇</p><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?？梢酝渡涑鰧嶒灳_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。水質(zhì)紫外可見分光光度計選擇</p><p style="text-indent:25px">上海儀電分析儀器有限公司致力于儀器儀表，是一家生產(chǎn)型的公司。公司業(yè)務(wù)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(wù)改進，為客戶提供良好的產(chǎn)品和服務(wù)。公司將不斷增強企業(yè)重點競爭力，努力學(xué)習(xí)行業(yè)知識，遵守行業(yè)規(guī)范，植根于儀器儀表行業(yè)的發(fā)展。在社會各界的鼎力支持下，持續(xù)創(chuàng)新，不斷鑄造***服務(wù)體驗，為客戶成功提供堅實有力的支持。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2140443.html</p></div></div></div></div></div><div id="cf8wnub" class="page-right twoColRt"><div id="j8zv3a3" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="5x3da33" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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