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<meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head><body> <h1><a href="http://www.cdcfah.com/">六月丁香婷婷亚洲中文字幕,欧美精品高清一区二区蜜芽,尤物92午夜福利视频,精品视频一区二区三区在线观看</a></h1> <div style="position:fixed;left:-9000px;top:-9000px;"><object id="qgqbi"></object><delect id="qgqbi"><sub id="qgqbi"><dl id="qgqbi"></dl></sub></delect><track id="qgqbi"></track><tr id="qgqbi"></tr><video id="qgqbi"></video><xmp id="qgqbi"><span id="qgqbi"></span></xmp><span id="qgqbi"></span><strong id="qgqbi"><em id="qgqbi"><sup id="qgqbi"><progress id="qgqbi"></progress></sup></em></strong><dl id="qgqbi"><small id="qgqbi"></small></dl><wbr id="qgqbi"></wbr><noscript id="qgqbi"></noscript><tr id="qgqbi"></tr><track id="qgqbi"><dl id="qgqbi"></dl></track><label id="qgqbi"><em id="qgqbi"></em></label><tbody id="qgqbi"></tbody><blockquote id="qgqbi"></blockquote><dfn id="qgqbi"><center id="qgqbi"></center></dfn><sub id="qgqbi"></sub><u 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class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988085019176/8464581.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="fv3kw2s" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988085019176/8464581.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="8fntkrc" 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>氮氣原子吸收分光光度計廠家,原子吸收分光光度計</p><p><span>***更新：</span>2021-02-05 04:14:18</p><p><span id="click" >瀏覽次數(shù)：8次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="xqizqbd" 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="knzgcd3" class="page-proshow02"><p class="title">詳細說明</p><div id="73hj3pg" class="box"><p><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(yīng)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，氮氣原子吸收分光光度計廠家。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，氮氣原子吸收分光光度計廠家，氮氣原子吸收分光光度計廠家，干擾背景比較嚴重，一般都需要校正背景。1970年北京科學儀器廠試制成WFD-Y1型單光束原子吸收分光光度計。氮氣原子吸收分光光度計廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="氮氣原子吸收分光光度計廠家,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">霧化器是原子化系統(tǒng)的中心部件，剖析的靈活度和精細度比較大水平上取決于霧化器的質(zhì)量。質(zhì)量良好的噴霧器,應(yīng)是霧滴小、霧量大、霧滴勻、噴霧穩(wěn),這取決于吸液毛細管噴口和節(jié)流嘴端面的相對位置和同心度。毛細管和節(jié)流嘴端面相對位置和同心度,應(yīng)在放大鏡下精心調(diào)理。每次調(diào)整效果可經(jīng)過察看霧化情況來判別。正常狀況下,霧滴分開噴嘴后應(yīng)沿毛細管線方向,向前成一錐形,上下左右對稱地散射開。也可經(jīng)過吸噴規(guī)范溶液測定吸光度來判別,直至呈現(xiàn)大吸光度時,行將位置固定下來。需求指出的是,任何時分一定制止在氧化亞氮一乙烘火焰中調(diào)理噴霧器,否則會發(fā)作回火。工業(yè)原子吸收分光光度計選擇原子吸收分光光度計基本結(jié)構(gòu)包括光源，原子化器，光學系統(tǒng)和檢測系統(tǒng)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="氮氣原子吸收分光光度計廠家,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991236161257/4858141.png"></div><p style="text-indent:25px">原子吸收分光光度法常使用哪些定量分析方法?規(guī)范曲線法：先配制相同基體的含有不同濃度待測元素的系列規(guī)范溶液，在選定的實驗條件下分別測其吸光度.以扣除空白值之后的吸光度為縱坐標，規(guī)范溶液濃度為橫坐標繪制規(guī)范曲線。在同樣操作條件下測定試樣溶液的吸光度，從規(guī)范曲線查得試樣溶液的濃度。運用該辦法時應(yīng)留意：配制的規(guī)范溶液濃度應(yīng)在吸光度與濃度成線性的范圍內(nèi)；整個剖析過程中操作條件應(yīng)堅持不變。另外，規(guī)范曲線法固然簡單，但必需保證規(guī)范樣品與試樣的物理性質(zhì)相同，保證不存在干擾物，關(guān)于組成尚不分明的樣品不能用規(guī)范曲線法。</p><p style="text-indent:25px">原子吸收分光光度計又稱為原子吸收光譜儀，是利用光源發(fā)出被測的特征光譜輻射，被經(jīng)過原子化器后的樣品蒸氣中的待測元素基態(tài)原子所吸收，通過測定特征輻射被吸收的大小，來求出被測元素的含量。原子吸收光譜儀主要由光源、原子化系統(tǒng)、光學系統(tǒng)、電學系統(tǒng)等四個基本部分組成，其工作原理：光源發(fā)出特征光譜輻射，經(jīng)過原子化器室后，由分光系統(tǒng)得到單色光經(jīng)過光電倍增管后到達檢測器，終端電腦從檢測器得到信號，進一步轉(zhuǎn)化為數(shù)據(jù)進行處理，因為原子化器沒有進樣時，光通過原子化器時沒有被吸收，透光率為100%，而當原子化器進樣時，光通過原子化器時有一部分被吸收，透光率減小。根據(jù)朗伯-比爾定律，吸光度與樣品濃度成正比，因此參照標準，根據(jù)吸光度可得出樣品的濃度。原子吸收分光光度計安全操作須知：建議將氣瓶安裝在不受陽光直接照射的室外。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="氮氣原子吸收分光光度計廠家,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988246893719/5353894.png"></div><p style="text-indent:25px">原子吸收分光光度計按光束形成可分為單光束（指從光源中發(fā)出的光只以單一光束的形式通過原子化器、單色器和檢測系統(tǒng)）和雙光束（指從光源發(fā)出的光被切光器分成兩束強度相等的光，一束為樣品光束通過原子化器被基態(tài)原子部分吸收；另一束只作為參比光束，不通過原子化器，其光強度不被減弱）兩類；按包含“單獨”的分光系統(tǒng)和檢測系統(tǒng)的數(shù)目又可分為單道（指儀器只有一個光源，一個單色器，一個顯示系統(tǒng)，每次只能測一種元素）、雙道（指儀器有兩個不同光源，兩個單色器兩個檢測顯示系統(tǒng)）和多道。目前普遍使用的是單道單光束或單道雙光束原子吸收分光光度計。原子吸收分光光度計型號繁多，不同型號儀器性能和應(yīng)用范圍不同?；鹧嬖游辗止夤舛扔嬋秉c是：原子化效率低，靈敏度不夠高。工業(yè)原子吸收分光光度計現(xiàn)貨</p><p style="text-indent:25px">原子吸收觀察的是構(gòu)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。氮氣原子吸收分光光度計廠家</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(gòu)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(gòu)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(luò)合反應(yīng)的分子），與我們的被測元素產(chǎn)生反應(yīng)，并且反應(yīng)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。氮氣原子吸收分光光度計廠家</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3167941.html</p></div></div></div></div></div><div id="ra72lzv" class="page-right twoColRt"><div id="bpbn3yp" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="q8fw2n8" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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