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href="http://www.cdcfah.com/cp/first-_yiqiyibiao/">儀器儀表</a>?<a href="http://www.cdcfah.com/cp/second-yiqiyibiao_fenxiyiqi/">分析儀器</a>?<a href="http://www.cdcfah.com/cp/third-fenxiyiqi_ysfxyq/">元素分析儀器</a>?國產原子吸收分光光度計多少錢服務為先上海儀電分析儀器供應</p><div id="lh95brf" class="leftbox clearfix"><h1>國產原子吸收分光光度計多少錢服務為先上海儀電分析儀器供應</h1><div id="flbjzfd" class="proBig"><div id="bhx9dbr" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991326259040/7441452.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="r7tbrpn" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991326259040/7441452.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="d9dtjfv" 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>國產原子吸收分光光度計多少錢,原子吸收分光光度計</p><p><span>***更新：</span>2021-02-03 00:20:53</p><p><span id="click" >瀏覽次數(shù)：4次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="7dtrntp" 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="jpnvtrf" class="page-proshow02"><p class="title">詳細說明</p><div id="hx95fvd" class="box"><p><p style="text-indent:25px">石墨爐原子化器相對于火焰原子化器具有體積小、檢出限低用樣量少等特點；石墨爐原子化的缺點主要是基體蒸發(fā)時可能造成較大的分子吸收，爐管本身的氧化也產生分子吸收，背景吸收較大，一些固體微粒引起光散射造成假吸收，因此使用石墨爐原子化器必須使用背景校正裝置校正。石墨爐原子化器主要包括爐體、電源、冷卻水、氣路系統(tǒng)等，目前商品儀器的爐體又分為縱向加熱和橫向加熱?？v向加熱石墨爐（國產儀器的石墨爐體多為縱向加熱）由于要在石墨管兩端的電極上進行水冷，國產原子吸收分光光度計多少錢，國產原子吸收分光光度計多少錢，造成沿光路方向上存在溫度梯度，使整個石墨管內具有不等溫性導致基體干擾嚴重，影響原子化過程。針對上述問題，商品儀器經(jīng)過多次的改進，又發(fā)展了平臺原子化（在改善縱向石墨爐加熱方面有比較大的貢獻）、探針原子化、電容放電強脈沖加熱石墨爐，這些技術都在一定程度上或多或少地彌補了縱向加熱的缺點，但還是沒有解決根本問題。而橫向加熱石墨爐技術恰恰能解決縱向的不等溫性的缺點，它較大增加了管內恒溫區(qū)域，降低原子化溫度和時間，使得原子濃度均勻且穩(wěn)定性好，明顯地降低基體效應和消除記憶效應，同時還可降低對爐體的要求，增加了石墨管的使用壽命，國產原子吸收分光光度計多少錢。原子吸收分析中，首先要使待測元素呈原子狀態(tài)。國產原子吸收分光光度計多少錢</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國產原子吸收分光光度計多少錢,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991326259040/7441452.png"></div><p style="text-indent:25px">原子吸收分光光度計可普遍應用于食品、醫(yī)藥、環(huán)境、生物、農業(yè)、石油化工、建筑、材料、地質、冶金、科研等領域。一、原子吸收火焰法：原子吸收的火焰法作為一種較常用的分析方法被普遍的使用，對于一些常見的，含量在一定可測范圍內金屬元素而言，火焰原子吸收法簡單而快捷，結果的準確度非常高。二、原子吸收石墨爐法：原子吸收石墨爐法是原子吸收應用中較經(jīng)典的方法，一般的石墨爐可以瞬時升溫至3000℃，對于一些含量極低的或者一些高溫元素的定量檢測十分有效，甚至比較多儀器和分析**認為，之所以原子吸收分光光度計沒有被淘汰至今還在普遍的適用正是因為原子吸收的石墨爐法的精度及較小檢測極限是目前所有測試方法中幾乎無可替代的。三、原子吸收氫化物法：也稱冷原子法，一般用于測定汞、砷之類的元素。所以在原子吸收分光光度計的選擇上，我們首先要選定主要是用哪一種方法去做金屬元素的含量測定，然后根據(jù)測定方法去確定原子吸收分光光度計的配置。全自動原子吸收分光光度計現(xiàn)貨原子吸收分光光度計，有火焰原子吸收分光光度計和帶石墨爐的原子吸收分光光度計兩種。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國產原子吸收分光光度計多少錢,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988150712025/4463747.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。運用該辦法時應留意：配制的規(guī)范溶液濃度應在吸光度與濃度成線性的范圍內；整個剖析過程中操作條件應堅持不變。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相同，保證不存在干擾物，關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">原子吸收分光光度法常使用哪些定量分析方法?規(guī)范參加法：適用于試樣的基體組成復雜且對測定有明顯干擾時，但在規(guī)范曲線呈線性關系的濃度范圍內的樣品。取四份相同體積的試樣溶液，從第二份起按比例參加不同量的待測元素的規(guī)范溶液．稀釋至一定體積。分別測定參加規(guī)范溶液后樣品的吸光度。以吸光度對參加的待測元素的濃度作圖，得到一條不經(jīng)過原點的直線，外延此直線與橫坐標的交點即為試樣溶液中待測元素的濃度。為得到較為精確的外推結果·應少用四個點來作外推曲線。需求留意的是，該辦法只能消弭基體效應的影響，而不能消弭背景吸收的影響，故應扣除背景值。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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國產原子吸收分光光度計多少錢,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">火焰原子吸收分光光度計，利用空氣—乙炔測定的元素可達30多種，若使用氧化亞氮—乙炔火焰，測定的元素可達70多種。但氧化亞氮—乙炔火焰安全性較差，應用不普遍?？諝狻胰不鹧嬖游辗止夤舛确ǎ话憧蓹z測到PPm級（10－6），精密度1％左右。國產的火焰原子吸收分光光度計，都可配備各種型號的氫化物發(fā)生器（屬電加熱原子化器），利用氫化物發(fā)生器，可測定砷（As）、銻（Sb）、鍺（Ge）、碲（Te）等元素。一般靈敏度在ng／ml級（10－9），相對標準偏差2％左右。汞(Hg)可用冷原子吸收法測定。原子吸收光譜分析工作原理：利用待測元素的共振輻射。飼料原子吸收分光光度計單價</p><p style="text-indent:25px">火焰原子吸收分光光度計應用多。國產原子吸收分光光度計多少錢</p><p style="text-indent:25px">如何才能正確選擇原子吸收分光光度計？1、原子吸收分光光度計空心陰極燈的工作電流?？招年帢O燈一般需要預熱10-30min才能達到穩(wěn)定輸出。燈電流過小，放電不穩(wěn)定，故光譜輸出不穩(wěn)定，且光譜輸出強度小;燈電流過大，發(fā)射譜線變寬，導致靈敏度下降，校正曲線彎曲，燈壽命縮短。選用燈電流的一般原則是，在保證有足夠強且穩(wěn)定的光強輸出條件下，盡量使用較低的工作電流。通常以空心陰極燈上標明的Z大電流的一半至三分之二作為工作電流。在具體的分析場合，較適宜的工作電流由實驗確定。2、原子吸收分光光度計進樣量。進樣量過小，吸收信號弱，不便于測量;進樣量過大，在火焰原子化法中，對火焰產生冷卻效應，在石墨爐原子化法中，會增加除殘的困難。在實際工作中，應測定吸光度隨進樣量的變化，達到滿意的吸光度的進樣量，即為應選擇的進樣量。國產原子吸收分光光度計多少錢</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3129269.html</p></div></div></div></div></div><div id="7dtrnlr" class="page-right twoColRt"><div id="7775ljx" class="box01 margin10 clearfix"><h3><a 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