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class="button">聯(lián)系我們</a></div></div><div id="utpw2ce" 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(hào)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="ixel8sj" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="2how43q" 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(jì)？1.原子吸收分光光度計(jì)分析線。通常選用共振吸收線為分析線，測(cè)定高含量元素時(shí)，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)，雙光束原子吸收分光光度計(jì)廠家供應(yīng)，火焰組分對(duì)其有明顯吸收，故用火焰原子吸收法測(cè)定這些元素時(shí)，不宜選用共振吸收線為分析線。2.原子吸收分光光度計(jì)狹縫寬度。狹縫寬度影響光譜通帶寬度與檢測(cè)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(cè)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，雙光束原子吸收分光光度計(jì)廠家供應(yīng)，雙光束原子吸收分光光度計(jì)廠家供應(yīng)。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(jì)測(cè)定每種元素均需要相應(yīng)的空心陰極燈，這對(duì)檢測(cè)工作帶來(lái)不便。雙光束原子吸收分光光度計(jì)廠家供應(yīng)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="雙光束原子吸收分光光度計(jì)廠家供應(yīng),原子吸收分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988150712025/4463747.png"></div><p style="text-indent:25px">為使原子吸收分光光度計(jì)檢測(cè)功能在檢定期間內(nèi)處于正常的工作狀態(tài)，確保檢驗(yàn)結(jié)果的準(zhǔn)確性和有效性。1、在儀器設(shè)備兩次檢定期間，對(duì)該設(shè)備進(jìn)行期間核查，以驗(yàn)證設(shè)備是否保持校準(zhǔn)時(shí)的狀態(tài),確保檢驗(yàn)結(jié)果的準(zhǔn)確性和有效性原子吸收分光光度計(jì)。2、范圍適用于各型號(hào)原子吸收分光光度計(jì)的期間核查。3、核查項(xiàng)目3.1標(biāo)準(zhǔn)曲線相關(guān)系數(shù)、精密度（RSD）、檢出限（L）、以及采用有證的標(biāo)準(zhǔn)物質(zhì)（已知濃度u并給出不確定度Ur的任何一種單標(biāo)準(zhǔn)物質(zhì)）進(jìn)行檢測(cè)結(jié)果的評(píng)定。3.2期間核查時(shí)可用上述的核查方法中的一種或多種。4、核查依據(jù)各型號(hào)原子吸收分光光度計(jì)使用說(shuō)明書以及相關(guān)的資料。甲醛原子吸收分光光度計(jì)差價(jià)原子吸收分光光度計(jì)針對(duì)于金屬微量元素的定量分析。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="雙光束原子吸收分光光度計(jì)廠家供應(yīng),原子吸收分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988105282341/1372565.png"></div><p style="text-indent:25px">原子吸收光譜儀分析中的干擾效應(yīng)：1.物理干擾：物理干擾是指試樣在轉(zhuǎn)移、蒸發(fā)和原子化過(guò)程中，由于試樣任何物理特性（如粘度、表面張力、密度等）的變化而引起的原子吸收強(qiáng)度下降的效應(yīng)。物理干擾是非選擇性干擾，對(duì)試樣各元素的影響基本是相似的。配制與被測(cè)試樣相似組成的標(biāo)準(zhǔn)樣品，是消除物理干擾較常用的方法。在不知道試樣組成或無(wú)法匹配試樣時(shí)，可采用標(biāo)準(zhǔn)加入法或稀釋法來(lái)減小和消除物理干擾。2.化學(xué)干擾：化學(xué)干擾是由于液相或氣相中被測(cè)元素的原子與干擾物質(zhì)組分之間形成熱力學(xué)更穩(wěn)定的化合物，從而影響被測(cè)元素化合物的解離及其原子化。磷酸根對(duì)鈣的干擾，硅、鈦形成難解離的氧化物、鎢、硼、希土元素等生成難解離的碳化物，從而使有關(guān)元素不能有效原子化，都是化學(xué)干擾的例子?；瘜W(xué)干擾是一種選擇性干擾。</p><p style="text-indent:25px">電熱原子化器電熱原子化器的種類有多種，如電熱高溫管式石墨爐原子化器、石墨杯原子化器、鉭舟原子化器、碳棒原子化器、鎳杯原子化器、高頻感應(yīng)爐和等離子噴焰等。在商品儀器中常用的電熱原子化器是管式石墨爐原子化器。石墨爐是用石墨管做成，將樣品用進(jìn)樣器定量注入石墨管中，并以石墨管作為電阻發(fā)熱體，通電后迅速升溫，使試樣達(dá)到原子化目的。它由加熱電源、保護(hù)氣控制系統(tǒng)和石墨管狀爐組成。外電源加于石墨管兩端供給原子化器能量，電流通過(guò)石墨管產(chǎn)生3000℃的高溫，使置于石墨管中的被測(cè)元素變?yōu)榛鶓B(tài)原子蒸氣。保護(hù)氣系統(tǒng)是控制保護(hù)氣的。外氣路中的Ar氣沿石墨管外壁流動(dòng)，以保護(hù)石墨管不被燒蝕；內(nèi)氣路中的Ar從管兩端流向管中心由管中心孔流出以有效地除去在干燥和灰化過(guò)程中產(chǎn)生的基體成分，同時(shí)保護(hù)已經(jīng)原子化了的原子不再被氧化。原子吸收分光光度計(jì)的上方必需準(zhǔn)備一個(gè)通風(fēng)罩，使熄滅器產(chǎn)生的熄滅氣體能順利排。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="雙光束原子吸收分光光度計(jì)廠家供應(yīng),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)儀器工作原理：將待分析物質(zhì)以適當(dāng)方法轉(zhuǎn)變?yōu)槿芤?，并將溶液以霧狀引入原子化器。此時(shí)，被測(cè)元素在原子化器中原子化為基態(tài)原子蒸氣。當(dāng)光源發(fā)射出的與被測(cè)元素吸收波長(zhǎng)相同的特征譜線通過(guò)基態(tài)原子蒸氣時(shí)，光能因被基態(tài)原子所吸收而減弱，其減弱的程度（吸光度）在一定條件下，與基態(tài)原子的數(shù)目（元素濃度）之間的關(guān)系，遵守朗伯-比耳定律。被基態(tài)原子吸收后的譜線，經(jīng)分光系統(tǒng)分光后，由檢測(cè)器接收，轉(zhuǎn)換為電信號(hào)，再經(jīng)放大器放大，由顯示系統(tǒng)顯示出吸光度或光譜圖。儀器基本結(jié)構(gòu)：原子吸收分光光度計(jì)主要由光源、原子化器、單色器、檢測(cè)系統(tǒng)和顯示系統(tǒng)等部分組成。氣態(tài)的原子能發(fā)射某些特征譜線，也能吸收同樣波長(zhǎng)的這些譜線。材料原子吸收分光光度計(jì)廠家</p><p style="text-indent:25px">原子吸收分光光度計(jì)應(yīng)用也有一定的局限性。雙光束原子吸收分光光度計(jì)廠家供應(yīng)</p><p style="text-indent:25px">如何才能正確選擇原子吸收分光光度計(jì)？1、原子吸收分光光度計(jì)空心陰極燈的工作電流?？招年帢O燈一般需要預(yù)熱10-30min才能達(dá)到穩(wěn)定輸出。燈電流過(guò)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(guò)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。在具體的分析場(chǎng)合，較適宜的工作電流由實(shí)驗(yàn)確定。2、原子吸收分光光度計(jì)進(jìn)樣量。進(jìn)樣量過(guò)小，吸收信號(hào)弱，不便于測(cè)量;進(jìn)樣量過(guò)大，在火焰原子化法中，對(duì)火焰產(chǎn)生冷卻效應(yīng)，在石墨爐原子化法中，會(huì)增加除殘的困難。在實(shí)際工作中，應(yīng)測(cè)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。雙光束原子吸收分光光度計(jì)廠家供應(yīng)</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/3079684.html</p></div></div></div></div></div><div id="ed3cs3h" class="page-right twoColRt"><div id="ice8x9v" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="lfw32zg" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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