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id="hqh3z83" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>國產(chǎn)**原子吸收分光光度計(jì)儀器,原子吸收分光光度計(jì)</p><p><span>***更新：</span>2021-01-27 17:26:17</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="fo2se2o" 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(jī): </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="eo3q3ll" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="tsz4fzq" class="box"><p><p style="text-indent:25px">原子吸收分光光度計(jì)空心陰方燈的作業(yè)電流挑選：空心陰方燈一般需求預(yù)熱10-30min才干到達(dá)安穩(wěn)輸出。燈電流過小，放電不安穩(wěn)，故光譜輸出不安穩(wěn)，且光譜輸出強(qiáng)度??；燈電流過大，發(fā)射譜線變寬，導(dǎo)致靈敏度下降，校正曲線曲折，燈壽數(shù)縮短。選用燈電流的一般原則是，國產(chǎn)**原子吸收分光光度計(jì)儀器，在保證有滿足強(qiáng)且安穩(wěn)的光強(qiáng)輸出條件下，國產(chǎn)**原子吸收分光光度計(jì)儀器，國產(chǎn)**原子吸收分光光度計(jì)儀器，盡量運(yùn)用較低的作業(yè)電流。通常以空心陰方燈上標(biāo)明的很大電流的一半至三分之二作為作業(yè)電流。在具體的剖析場合，很適宜的作業(yè)電流由實(shí)驗(yàn)確定。現(xiàn)在我國已有多家企業(yè)生產(chǎn)多種型號、性能較先進(jìn)的原子吸收分光光度計(jì)。國產(chǎn)**原子吸收分光光度計(jì)儀器</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國產(chǎn)**原子吸收分光光度計(jì)儀器,原子吸收分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988188495975/1516361.png"></div><p style="text-indent:25px">火焰原子化器火焰原子化包括兩個步驟:先將試樣溶液變成細(xì)小霧滴（即霧化階段），然后使霧滴接受火焰供給的能量形成基態(tài)原子（即原子化階段）。火焰原子化器由霧化器、預(yù)混室和燃燒器等部分組成。嘛余霧化器的作用是將試液霧化成微小的霧滴。霧化器的性能會對靈敏度、測量精度和化學(xué)干擾等產(chǎn)生影響，因此要求其噴霧穩(wěn)定、霧滴細(xì)微均勻和霧化效率高。目前，商品原子化器多數(shù)使用氣動型霧化器。塑預(yù)混室也稱霧化室，其作用是進(jìn)一步細(xì)化霧滴，并使之與燃料氣均勻混合后進(jìn)入火焰。燃燒器的作用是使燃?xì)庠谥細(xì)獾淖饔孟滦纬苫鹧?，使進(jìn)入火焰的試樣微粒原子化。原子吸收光譜分析較常用的火焰是空氣-乙炔火焰和氧化亞氮（笑氣）-乙炔火焰。當(dāng)采用不同的燃燒氣時，應(yīng)注意調(diào)整燃燒器的狹縫寬度和長度以適應(yīng)不同燃燒氣的燃燒速率，防止回火爆開。由于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。但火焰原子化法原子化效率低，靈敏度不夠高，而且一般不能直接分析固體樣品?；鹧嬖踊ㄟ@些不足之處，促使無火焰原子化法的發(fā)展。專業(yè)原子吸收分光光度計(jì)性價(jià)比原子吸收分光光度計(jì)氧化亞氮—乙炔火焰安全性較差。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國產(chǎn)**原子吸收分光光度計(jì)儀器,原子吸收分光光度計(jì)" 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(jì)與紫外可見分光光度計(jì)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(jì)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(jì)算出濃度。而紫外—可見分光光度計(jì)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(jì)算出濃度。</p><p style="text-indent:25px">原子吸收分光光度計(jì)原子化條件：程序升溫的條件選擇:在石墨爐原子化法中，合理選擇干燥、灰化、原子化及除殘溫度與時間是十分重要的。干燥應(yīng)在稍低于溶劑沸點(diǎn)的溫度下進(jìn)行，以防止試液飛濺?；一哪康氖浅セw和局外組分，在保證被測元素沒有損失的前提下應(yīng)盡可能使用較高的灰化溫度。原子化溫度的選擇原則是，選用達(dá)到較大吸收信號的較低溫度作為原子化溫度。原子化時間的選擇，應(yīng)以保證完全原子化為準(zhǔn)。原子化階段停止通保護(hù)氣，以延長自由原子在石墨爐內(nèi)的平均停留時間。除殘的目的是為了消除殘留物產(chǎn)生的記憶效應(yīng)，除殘溫度應(yīng)高于原子化溫度。原子吸收分光光度計(jì)分析速度較快，操作簡便，半個小時內(nèi)能連續(xù)測定幾十個試樣中的5、6種元素。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國產(chǎn)**原子吸收分光光度計(jì)儀器,原子吸收分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991291551872/1267970.png"></div><p style="text-indent:25px">原子吸收分光光度計(jì)工作原理：元素在熱解石墨爐中被加熱原子化，成為基態(tài)原子蒸汽，對空心陰極燈發(fā)射的特征輻射進(jìn)行選擇性吸收。在一定濃度范圍內(nèi)，其吸收強(qiáng)度與試液中被測元素的含量成正比。其定量關(guān)系可用郎伯-比耳定律，A=-lgI/Io=-lgT=KCL，式中I為透射光強(qiáng)度；I0為發(fā)射光強(qiáng)度；T為透射比；L為光通過原子化器光程(長度)，每臺儀器的L值是固定的；C是被測樣品濃度；所以A=KC。利用待測元素的共振輻射，通過其原子蒸汽，測定其吸光度的裝置稱為原子吸收分光光度計(jì)。它有單光束，雙光束，雙波道，多波道等結(jié)構(gòu)形式。其基本結(jié)構(gòu)包括光源，原子化器，光學(xué)系統(tǒng)和檢測系統(tǒng)。它主要用于痕量元素雜質(zhì)的分析，具有靈敏度高及選擇性好兩大主要優(yōu)點(diǎn)。普遍應(yīng)用于各種氣體，金屬有機(jī)化合物，金屬醇鹽中微量元素的分析。但是測定每種元素均需要相應(yīng)的空心陰極燈，這對檢測工作帶來不便。原子化器主要有兩大類，即原子吸收分光光度計(jì)和電熱原子化器。專業(yè)原子吸收分光光度計(jì)性價(jià)比</p><p style="text-indent:25px">原子吸收分光光度計(jì)是屬于原子光譜。國產(chǎn)**原子吸收分光光度計(jì)儀器</p><p style="text-indent:25px">通常情況下，原子處于基態(tài)。當(dāng)相當(dāng)于原子中的電子由基態(tài)躍遷到激發(fā)態(tài)所需求的輻射頻率經(jīng)過原子蒸氣，原子就能從入射輻射中吸收能量，發(fā)生共振吸收，然后發(fā)生吸收光譜。原子吸收剖析便是使用基態(tài)原子對特征輻射的吸收程度的，常使用強(qiáng)吸收線作為剖析線。原子吸收光譜儀由以下四部分組成光源系統(tǒng):空心陰燈原子化系統(tǒng):火焰原子化器;原子吸收分光光度計(jì)或氫化物發(fā)生器。分光系統(tǒng)：單色器檢測系統(tǒng)：光電倍增管等。原子吸收分光光度計(jì)的長處是:原子化效率高，在可調(diào)的高溫下試樣使用率達(dá)100，活絡(luò)度高，試樣用量少，適用于難熔元素的測定。缺陷是:試樣組成不均勻性的影響較大，測定度較低，共存化合物的攪擾比火焰原子化法大，攪擾布景比較嚴(yán)重，一般都需求校正布景。國產(chǎn)**原子吸收分光光度計(jì)儀器</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3037232.html</p></div></div></div></div></div><div id="oiapbdk" class="page-right twoColRt"><div id="3rose7p" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="w7wq3kr" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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