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class="content"><p><span>需求數量：</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>手持原子吸收分光光度計生產廠家,原子吸收分光光度計</p><p><span>***更新：</span>2021-01-31 04:12:57</p><p><span id="click" >瀏覽次數：2次</span></p><a rel="nofollow" class="button">聯系我們</a></div></div><div id="yxegdp9" 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="7cel7rt" class="page-proshow02"><p class="title">詳細說明</p><div id="hwdkrim" class="box"><p><p style="text-indent:25px">原子吸收分光光度計作用：原子吸收分光光度計的作用是進樣器把溶液中的金屬離子提升到原子化器，用原子化器（石墨爐原子化器或者火焰原子化器）把液體通過高溫的方式轉化為氣態(tài)原子蒸汽，由于元素不同，導致特征譜線不同，不同的原子會吸收其特征波長的光子。這時候從光源（空心陰極燈）發(fā)出來的特征譜線通過原子蒸汽被吸收一部分，比較原始光強（I0）和吸收后的光強(I)，用比爾定律得出吸收比率，手持原子吸收分光光度計生產廠家，進而用標準曲線法或者標準加入法計算濃度，手持原子吸收分光光度計生產廠家，手持原子吸收分光光度計生產廠家。原子吸收分光光度計由于儀器使用中，需用乙炔、氫氣、氬氣、氧化亞氮（俗稱笑氣）等。手持原子吸收分光光度計生產廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="手持原子吸收分光光度計生產廠家,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991311337342/3521940.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用范圍不同。學校原子吸收分光光度計性價比原子吸收分光光度計即每種待測元素都要有一個能發(fā)射特定波長譜線的光源。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="手持原子吸收分光光度計生產廠家,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">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。前者原子化的溫度在2100℃～2400℃之間，后者在2900℃～3000℃之間。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，若使用笑氣—乙炔火焰，測定的元素可達70多種。但笑氣—乙炔火焰安全性較差，客戶應用不普遍，基本上實驗室都取締了?？諝狻胰不鹧嬖游辗止夤舛确?，一般可檢測到PPm級（10-6），精密度1%左右。國產的火焰原子吸收分光光度計，AA-1800C，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。石墨爐原子吸收分光光度計，可以測定近50種元素。石墨爐法，進樣量少，靈敏度高，有的元素也可以分析到pg/ml級。</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，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。原子吸收分光光度計定量關系可用郎伯-比耳定律。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="手持原子吸收分光光度計生產廠家,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991268710095/3209448.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，然后根據測定方法去確定原子吸收分光光度計的配置。將試樣中待測元素變成氣態(tài)的基態(tài)原子的過程稱為試樣的“原子化”。手持原子吸收分光光度計生產廠家</p><p style="text-indent:25px">原子吸收光譜儀分析中的干擾效應：物理干擾。手持原子吸收分光光度計生產廠家</p><p style="text-indent:25px">原子吸收分光光度計能檢測哪些元素：1、堿金屬檢測：堿金屬（Li，Na，K，Rb，Cs）是用原子吸收分光光度法測定的靈敏度比較高的一類元素。堿金屬的沸點較低，通過火焰區(qū)能立刻蒸發(fā)產生背景吸收。2、堿土金屬檢測：堿土金屬元素（Be，Mg，Ca，Sr，Ba）在火焰中易生成氧化物和少量的MOH型化合物，原子化效率強烈地依賴于火焰組成和火焰高度，因此，必須仔細地控制燃氣和助燃氣的比例，恰當地調節(jié)燃燒器的高度。3、有色金屬檢測：這一組元素包括Cu，Zn，Cd，Hg，Sn，Pb，Sb，Bi等。4、黑色金屬檢測：這一組元素包括Fe，Ni，Cr，Mo，Mn等。在合金中，這些元素常共存在一起。5、貴金屬檢測：貴金屬在某些試樣中含量比較低，一般要經過化學富集之后才能進行檢測。6、難熔元素檢測：這組元素包括B，Be，Si，Ge，V，Nb，Ta，W，Th，U，Re，Sc，Y和稀土元素。它們容易形成難離解的耐熔氧化物，必須在強還原性空氣—乙炔火焰中進行測定。手持原子吸收分光光度計生產廠家</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3089138.html</p></div></div></div></div></div><div id="kewolsh" class="page-right twoColRt"><div id="g7lfh8b" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="rbyacti" 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配件哪家強信息推薦自業(yè)物資供應" class="vcenter" 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