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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="qa8pvda" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988150712025/4463747.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="thp0auu" 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>食品安全原子吸收分光光度計現(xiàn)貨,原子吸收分光光度計</p><p><span>***更新：</span>2021-02-04 03:12:17</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="lhhphl6" 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="yixubt5" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="5fzltjv" class="box"><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。空心陰極燈一般需要預(yù)熱10-30min才能達(dá)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(qiáng)度小;燈電流過大，發(fā)射譜線變寬，導(dǎo)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(qiáng)且穩(wěn)定的光強(qiáng)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(biāo)明的Z大電流的一半至三分之二作為工作電流，食品安全原子吸收分光光度計現(xiàn)貨，食品安全原子吸收分光光度計現(xiàn)貨。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(jìn)樣量。進(jìn)樣量過小，吸收信號弱，不便于測量;進(jìn)樣量過大，在火焰原子化法中，對火焰產(chǎn)生冷卻效應(yīng)，在石墨爐原子化法中，會增加除殘的困難。在實際工作中，食品安全原子吸收分光光度計現(xiàn)貨，應(yīng)測定吸光度隨進(jìn)樣量的變化，達(dá)到滿意的吸光度的進(jìn)樣量，即為應(yīng)選擇的進(jìn)樣量。原子吸收分光光度計使儀器顯示數(shù)字化、進(jìn)樣自動化。食品安全原子吸收分光光度計現(xiàn)貨</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="食品安全原子吸收分光光度計現(xiàn)貨,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">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。國內(nèi)**原子吸收分光光度計賣價原子吸收分光度計分析樣品優(yōu)點：準(zhǔn)確度好。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="食品安全原子吸收分光光度計現(xiàn)貨,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">新購儀器應(yīng)及時開箱,按清單逐一查對主機(jī)、附件、零配件和運用闡明書等能否齊全,同時要檢查儀器二表觀能否有損傷。如發(fā)現(xiàn)問題及時向消費戶家提出,要留意維護(hù)現(xiàn)場,以便剖析損傷緣由。在開箱后和裝置前,必需認(rèn)真閱讀儀器運用闡明書,熟習(xí)儀器原理、構(gòu)造和運用辦法,理解儀器對實驗,室環(huán)境條件和安裝條件的請求：完善條件和做好裝置前的各項準(zhǔn)備工作將主機(jī)、計算機(jī)、打印機(jī)、空壓機(jī)、循環(huán)冷卻水安裝、石墨爐及其電源安裝當(dāng)心從包裝箱中取出,按闡明書請求整體規(guī)劃。主機(jī)和附件放在工作臺上以后,調(diào)整其底腳使之平穩(wěn)、受力平均。逐一檢查主機(jī)的外光路,主機(jī)和配件電器及機(jī)械局部的表觀情況。然后依照闡明書中的請求銜接好儀器的電路、氣路和水路。</p><p style="text-indent:25px">原子吸收分光光度計的實際應(yīng)用：1、有機(jī)物分析中的應(yīng)用：利用間接法可以測定多種有機(jī)物。8-羥基喹啉(Cu)、醇類(Cr)、醛類(Ag)、酯類(Fe)、酚類(Fe)、聯(lián)乙酰(Ni)、酞酸(Cu)、脂肪胺(co)、氨基酸(Cu)、維生素C(Ni)、氨茴酸(Co)、雷米封(Cu)、甲酸奎寧(Zn)、有機(jī)酸酐(Fe)、苯甲基青霉素(Cu)、葡萄糖(Ca)、環(huán)氧化物水解酶(PbO、含鹵素的有機(jī)化合物(Ag)等多種有機(jī)物，均通過與相應(yīng)的金屬元素之間的化學(xué)計量反應(yīng)而間接測定。2、金屬化學(xué)形態(tài)分析中的應(yīng)用：通過氣相色譜和液體色譜分離然后以原子吸收光譜加以測定，可以分析同種金屬元素的不同有機(jī)化合物。例如汽油中5種烷基鉛，大氣中的5種烷基鉛、烷基硒、烷基胂、烷基錫，水體中的烷基胂、烷基鉛、烷基揭、烷基汞、有機(jī)鉻，生物中的烷基鉛、烷基汞、有機(jī)鋅、有機(jī)銅等多種金屬有機(jī)化合物，均可通過不同類型的光譜原子吸收聯(lián)用方式加以鑒別和測定?；鹧嬖踊ǖ膬?yōu)點是：火焰原子化法的操作簡便，重現(xiàn)性好，有效光程大。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="食品安全原子吸收分光光度計現(xiàn)貨,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">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分析線。通常選用共振吸收線為分析線，測定高含量元素時，可以選用靈敏度較低的非共振吸收線為分析線。As、Se等共振吸收線位于200nm以下的遠(yuǎn)紫外區(qū)，火焰組分對其有明顯吸收，故用火焰原子吸收法測定這些元素時，不宜選用共振吸收線為分析線。2.原子吸收分光光度計狹縫寬度。狹縫寬度影響光譜通帶寬度與檢測器接受的能量。原子吸收光譜分析中，光譜重疊干擾的幾率小，可以允許使用較寬的狹縫。調(diào)節(jié)不同的狹縫寬度，測定吸光度隨狹縫寬度而變化，當(dāng)有其它的譜線或非吸收光進(jìn)入光譜通帶內(nèi)，吸光度將立即減小。不引起吸光度減小的較大狹縫寬度，即為應(yīng)選取的合適的狹縫寬度。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。國內(nèi)**原子吸收分光光度計賣價</p><p style="text-indent:25px">原子吸收分光度計分析樣品優(yōu)點：抗干擾能力強(qiáng)。食品安全原子吸收分光光度計現(xiàn)貨</p><p style="text-indent:25px">原子吸收光譜儀所檢測，導(dǎo)致吸光度值偏高：光譜背景除了波長特征之外，還有時間、空間分布特征。分子吸收通常先于原子吸收信號之前產(chǎn)生，當(dāng)有快速響應(yīng)電路和記錄裝置時，可以從時間上分辨分子吸收和原子吸收信號。樣品蒸氣在石墨爐內(nèi)分布的不均勻性，導(dǎo)致了背景吸收空間分布的不均勻性。提高溫度使單位時間內(nèi)蒸發(fā)出的背景物的濃度增加，同時也使分子解離增加。這兩個因素共同制約著背景吸收。在恒溫爐中，提高溫度和升溫速率，使分子吸收明顯下降。食品安全原子吸收分光光度計現(xiàn)貨</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3150514.html</p></div></div></div></div></div><div id="jlw8qw9" class="page-right twoColRt"><div id="ddudr0c" class="box01 margin10 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