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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>高效原子吸收分光光度計報價,原子吸收分光光度計</p><p><span>***更新：</span>2021-01-27 18:25:07</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="a2x7l2y" 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="y8as2ev" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="n8ubdfw" class="box"><p><p style="text-indent:25px">原子吸收分光光度計原子化條件：(1)火焰類型和特性:在火焰原子化法中，火焰類型和特性是影響原子化效率的主要因素。對低、中溫元素，使用空氣-乙炔火焰;對高溫元素，宜采用氧化亞氮-乙炔高溫火焰;對分析線位于短波區(qū)(200nm以下)的元素，使用空氣-氫火焰是合適的。對于確定類型的火焰，稍富燃的火焰(燃?xì)饬看笥诨瘜W(xué)計量)是有利的。對氧化物不十分穩(wěn)定的元素如Cu、Mg，高效原子吸收分光光度計報價、Fe、Co、Ni等，高效原子吸收分光光度計報價，用化學(xué)計量火焰(燃?xì)馀c助燃?xì)獾谋壤c它們之間化學(xué)反應(yīng)計量量相近)或貧燃火焰(燃?xì)饬啃∮诨瘜W(xué)計量)也是可以的。為了獲得所需特性的火焰，需要調(diào)節(jié)燃?xì)馀c助燃?xì)獾谋壤?2)燃燒器的高度選擇:在火焰區(qū)內(nèi)，高效原子吸收分光光度計報價，自由原子的空間分布是不均勻，且隨火焰條件而改變，因此，應(yīng)調(diào)節(jié)燃燒器的高度，以使來自空心陰極燈的光束從自由原子濃度較大的火焰區(qū)域通過，以期獲得高的靈敏度。為使原子吸收分光光度計檢測功能在檢定期間內(nèi)處于正常的工作狀態(tài)，確保檢驗結(jié)果的準(zhǔn)確性和有效性。高效原子吸收分光光度計報價</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="高效原子吸收分光光度計報價,原子吸收分光光度計" 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與紫外可見分光光度計的區(qū)別：1、標(biāo)準(zhǔn)溶液:原子吸收分光光度計使用的標(biāo)準(zhǔn)溶液在4℃溫度下可保存較長時間，放置室溫后可正常使用。紫外可見分光光度計樣品及標(biāo)準(zhǔn)溶液顯色穩(wěn)定后需在半小時之內(nèi)測定，且對溫度及時間要求比較苛刻。2、檢測時間:原子吸收分光光度計分析速度較快，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。紫外可見分光光度計由于有顯色過程，測量時間相對而言較長，操作比較麻煩。3、應(yīng)用對象：原子吸收分光光度計針對于金屬微量元素的定量分析，火焰法：液樣含量范圍通常在0。1PPM~15PPM之間（個別元素如錫會高些）；石墨爐分析在火焰法的基礎(chǔ)上則能提高2~3個數(shù)級，即液樣含量范圍通常在0。001PPM~0。100PPM之間。紫外可見分光光度計分析含量范圍一般在1PPM以上，主要分析高含量的樣品。4、操作性：原子吸收分光光度計操作簡單,對化驗員要求比較低，干擾低。紫外可見分光光度計樣品處理極為復(fù)雜,對化驗員要求比較高。工業(yè)原子吸收分光光度計廠家供應(yīng)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(xué)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="高效原子吸收分光光度計報價,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">原子吸收分光光度計剖析是現(xiàn)在很靈敏的方法之一。火焰原子吸收的相對靈敏度為ug/ml-ng/ml，無火焰原子吸收分光光度計的肯定靈敏度在10-10-10-14之間。如果采取預(yù)富集，可進(jìn)一步進(jìn)步剖析靈敏度。因為該方法的靈敏度高，使剖析手續(xù)簡化可直接測定，則縮短剖析周期加快丈量進(jìn)程。因為靈敏度高，則需樣量少。微量進(jìn)樣熱核的引進(jìn)，可使火趣味的需樣量少至20-300ul。無火焰原子吸收分光光度計剖析的需樣量*5–100ul。固體直接進(jìn)樣石墨爐原子吸收法*需0.005-30mg，這關(guān)于實驗來歷困難的剖析是很為有利的。</p><p style="text-indent:25px">火焰中有兩種以上原子的吸收線與光源發(fā)射的剖析線相堆疊時產(chǎn)生臨近線干擾，這種干擾使結(jié)果偏高。當(dāng)剖析元素的吸收線和共存元素的吸收線完整堆疊，而剖析元素的含量比較低時，測得的只是共存元素的吸收信號。當(dāng)剖析元素的剖析線中心位置和共存元素的吸收線的中心位置稍有偏離，但仍有相當(dāng)水平的堆疊，此時得于的吸收信號仍有比較大一局部是共存元素產(chǎn)生的。當(dāng)共存元素的吸收線和剖析元素的吸收線稍有堆疊時，吸收信號中仍有小局部是共存元素產(chǎn)生的。只要剖析元素的吸收線和共存元素的吸收線完整別離時，共存元素才不產(chǎn)生干擾。Co253.649對Hg253.652r的干擾是典型的吸收線堆疊干擾。我國在1963年開始對原子吸收分光光度計有一般性介紹。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="高效原子吸收分光光度計報價,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988188495975/1516361.png"></div><p style="text-indent:25px">石墨爐原子吸收分光光度計火焰類型：火焰類型和狀態(tài)對靈敏度高低起著重要作用，應(yīng)根據(jù)被測元素特性去選擇不同火焰。目前火焰按類型分有空氣一氫火焰、空氣一乙炔火焰、一氧化氮一乙炔火焰?？諝庖粴浠鹧娴幕鹧鏈囟容^低，用于測定火焰中容易原子化的元素如砷、硒等;空氣一乙炔火焰屬于中溫火焰，用于測定火焰中較難離解的元素如鎂、鈣、銅、鋅、鉛、錳等;一氧化氮一乙炔火焰屬于高溫火焰，用于測定火焰中難于離解的元素如釩、鋁等?；鹧姘礌顟B(tài)分有貧焰、化學(xué)計量焰、富焰。貧焰是指使用過量氧化劑時的火焰，由于大量冷的氧化劑帶走火焰中的熱量，這種火焰溫度較低，又由于氧化劑充分，燃燒完全，火焰具有氧化性氣氛，所以這種火焰適用于堿金屬元素的測定?；瘜W(xué)計量焰是按化學(xué)計量關(guān)系計算的燃料和氧化劑比率燃燒的火焰，它具有溫度高、干擾少、穩(wěn)定、背景低等特點，除堿金屬和易形成難離解氧化物的元素，大多數(shù)常見元素常用這種火焰。富焰是便用過量燃料的火焰，由于燃燒不完全，火焰具有較強(qiáng)的還原氣氛，所以，這種火焰具有還原性，適用于測定較易于形成難熔氧化物的元素如鑰、稀土元素等。原子吸收分光度計分析樣品優(yōu)點：操作方便、快速?；ぴ游辗止夤舛扔嫴顑r</p><p style="text-indent:25px">原子吸收分光光度計空氣—乙炔火焰原子吸收分光光度計。高效原子吸收分光光度計報價</p><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）?；鹧嬖踊饔伸F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。高效原子吸收分光光度計報價</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3037259.html</p></div></div></div></div></div><div id="sfmt873" class="page-right twoColRt"><div id="feldugn" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="8o7dlmy" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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