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class="proBig"><div id="luwdp3i" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991385859509/5179129.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="wvsumfb" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991385859509/5179129.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="cqszl2w" 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>空氣原子吸收分光光度計排名,原子吸收分光光度計</p><p><span>***更新：</span>2021-01-29 09:15:35</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="8vsu3kh" 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="udawosj" class="page-proshow02"><p class="title">詳細說明</p><div id="ba38lfq" class="box"><p><p style="text-indent:25px">原子吸收分光光度計把有單光束和雙度光束兩種類型如果將原子化質(zhì)器當作分光光度計的比色皿，空氣原子吸收分光光度計排名，空氣原子吸收分光光度計排名，其儀器的構造到與分光光度計比較相似。與分光光度計相比，不同點：(1)采用銳線光源；(2)單色器在火焰與檢測器之間。如果像分光光度計那樣，把單色器置于原子化器之前，火焰本身所發(fā)射的連續(xù)光譜就會直接照射在PMT上，會導致PMT壽命縮短，甚至不能正常工作。(3)原子化系統(tǒng)：除了光源發(fā)射的光外，還存在：a.火焰本身所發(fā)射的連續(xù)光譜；b.原子吸收中的原子發(fā)射現(xiàn)象。在原子化過程中，基態(tài)原子受到輻射躍遷到激發(fā)態(tài)后，處于不穩(wěn)定狀態(tài)，返回基態(tài)時，可能將能量又以光的形式釋放出來。故既存在原子吸收，也有原子發(fā)射。產(chǎn)生的輻射也不一定在一個方向上，但對測量仍將產(chǎn)生一定干擾，空氣原子吸收分光光度計排名。原子吸收分光光度計使用的是空心陰極燈發(fā)射特征波長的銳線光，選擇性會更好。空氣原子吸收分光光度計排名</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="空氣原子吸收分光光度計排名,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991385859509/5179129.png"></div><p style="text-indent:25px">光源的作用是發(fā)射出能被待測元素吸收的特征波長譜線，供測量用。為了保證峰值吸收的測量，要求光源必須能發(fā)射出比吸收線寬度更窄的銳線光譜，并且強度大而穩(wěn)定，背景低且噪聲小，使用壽命長?？招年帢O燈（hollowcathodelamp，HCL）、無極放電燈、蒸氣放電燈和激光光源燈都能滿足上述要求，其中應用較普遍的是空心陰極燈和無極放電燈。量寶空心陰極燈又稱元素燈，根據(jù)陰極材料的不同，分為單元素燈和多元素燈通常，單元素的空心陰極燈只能用于一種元素的測定，這類燈發(fā)射線干擾少，強度高，但每測一種元素需要更換一種燈。多元素燈可連續(xù)測定幾種元素，減少了換燈的麻煩，但光強度較弱，容易產(chǎn)生干擾。目前，中國生產(chǎn)的空心陰極燈可以滿足國內(nèi)外各種型號的原子吸收分光光度計的要求，元素品種達60余種。高性能原子吸收分光光度計差價原子吸收分光光度計型號繁多，不同型號儀器性能和應用范圍不同。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="空氣原子吸收分光光度計排名,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988085019176/8464581.png"></div><p style="text-indent:25px">原子吸收分光光度計儀器分類：1、火焰原子化法的優(yōu)點是：火焰原子化法的操作簡便，重現(xiàn)性好，有效光程大，對大多數(shù)元素有較高靈敏度，因此應用普遍。缺點是：原子化效率低，靈敏度不夠高，而且一般不能直接分析固體樣品；2、石墨爐原子化器的優(yōu)點是：原子化效率高，在可調(diào)的高溫下試樣利用率達100%，靈敏度高，試樣用量少，適用于難熔元素的測定。缺點是：試樣組成不均勻性的影響較大，測定精密度較低，共存化合物的干擾比火焰原子化法大，干擾背景比較嚴重，一般都需要校正背景。</p><p style="text-indent:25px">原子吸收分光光度計與紫外可見分光光度計的區(qū)別：1、原理：原子吸收觀察的是構成物質(zhì)的元素（原子）中的電子在原子軌道中的躍遷，屬于原子吸收。紫外可見光吸收觀察的是構成物質(zhì)的分子中的電子在分子軌道中的躍遷，屬于分子吸收。2、能量:兩者有所同，又有所不同。定量分析的原則同，而測量所需的光能量不同：原子吸收為X射線，能量大，可激發(fā)電子從低的原子軌道向高的原子軌道躍遷。紫外可見吸收為紫外光及可見光，能量小，只能激發(fā)電子從分子軌道向較低（或次低）的空的分子軌道躍遷。通俗的說，原子吸收分光光度計是用較高的溫度來燃燒分子，使之原子化（變?yōu)榛鶓B(tài)原子），再通過特征輻射，把基態(tài)原子激發(fā)，并吸收能量，通過這個能量差（透過率）來計算出濃度。而紫外—可見分光光度計是通過顯色劑（一種能和我們被測元素產(chǎn)生絡合反應的分子），與我們的被測元素產(chǎn)生反應，并且反應物分子帶有特定的顏色，經(jīng)過分子吸收氘燈（紫外區(qū)）或鎢燈（可見區(qū)）的照射，吸收燈發(fā)射的能量，通過能量差（透過率）來計算出濃度。原子吸收分光光度計一般可檢測到PPm級（10-6）。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="空氣原子吸收分光光度計排名,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991252020619/9480950.png"></div><p style="text-indent:25px">原子吸收分光光度計的安全運用留意事項：1、在運輸過程中遭到劇烈碰擊的儀器，主機不能冒然通電。2、長期在惡劣條件寄存的儀器應該經(jīng)常維護保養(yǎng)。3、一旦儀器的報警器發(fā)出聲音,應當即關掉氣源，并關機。4、請您隨時留意，一旦發(fā)生異味，請當即切斷電源，關掉乙炔鋼瓶總閥門。請將空壓機的空氣管插入燃氣管道中，并涂改肥皂水以檢查燃氣管道各接頭是否漏氣，特別應該檢查霧化筒后部的防爆塞是否密封無缺，決不能在發(fā)生漏氣時燃燒操作，否則容易發(fā)生回火爆開。5、每次燃燒前檢查廢液管是否打好水封；確認水封無誤時方可開機燃燒。6、乙炔鋼瓶放置在接近儀器室的房間內(nèi)，保持空氣流通，并應有防火標識。7、必定要運用的乙炔專屬減壓閥，并裝有防回火設備。原子吸收光譜分析中，光譜重疊干擾的幾率小，可以允許使用較寬的狹縫。國產(chǎn)**原子吸收分光光度計多少錢</p><p style="text-indent:25px">原子吸收分光光度計原子化條件：火焰類型和特性?？諝庠游辗止夤舛扔嬇琶?/p><p style="text-indent:25px">原子吸收分光光度計與紫外可見分光光度計的區(qū)別：1、光源:紫外可見分光光度計使用的是鎢燈或氘燈發(fā)射連續(xù)光譜。原子吸收分光光度計使用的是空心陰極燈發(fā)射特征波長的銳線光，選擇性會更好。2、檢測器：紫外可見分光光度計一般使用光電管來檢測。而原子吸收分光光度計使用的是光電倍增管，分辨力比光電管強。3、應用：原子吸收分光光度計是屬于原子光譜。紫外可見分光光度計屬于分子光譜，兩者都符合朗伯-比耳定律；4、檢出限:原子吸收分光光度計檢出限低，火焰原子吸收法的檢出限可達到ppb級。紫外可見分光光度計如果顯色劑不同則檢出限也不一樣，但每種顯色劑帶來的干擾也會不一樣。空氣原子吸收分光光度計排名</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3065329.html</p></div></div></div></div></div><div id="shjlcjg" class="page-right twoColRt"><div id="zol7cjq" class="box01 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