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class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="vqqak9y" class="box"><p><p style="text-indent:25px">火焰原子吸收分光光度計(jì)，利用空氣—乙炔測(cè)定的元素可達(dá)30多種，若使用氧化亞氮—乙炔火焰，測(cè)定的元素可達(dá)70多種。但氧化亞氮—乙炔火焰安全性較差，應(yīng)用不普遍?？諝狻胰不鹧嬖游辗止夤舛确?，一般可檢測(cè)到PPm級(jí)（10－6），精密度1％左右。國產(chǎn)的火焰原子吸收分光光度計(jì)，都可配備各種型號(hào)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(cè)定砷（As），石油原子吸收分光光度計(jì)排行，石油原子吸收分光光度計(jì)排行，石油原子吸收分光光度計(jì)排行、銻（Sb）、鍺（Ge）、碲（Te）等元素。一般靈敏度在ng／ml級(jí)（10－9），相對(duì)標(biāo)準(zhǔn)偏差2％左右。汞(Hg)可用冷原子吸收法測(cè)定。原子吸收分光光度計(jì)能夠靈敏可靠地測(cè)定微量或痕量元素。石油原子吸收分光光度計(jì)排行</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="石油原子吸收分光光度計(jì)排行,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">調(diào)整熄滅器位置的目的在于使其縫口平行于外光路的光軸并位于正下方,以保證空心陰極燈的光束完整經(jīng)過火焰并集聚于火焰中心而取得較高的靈活度。熄滅器的調(diào)整是在靜態(tài)下停止的。常以銅燈(324.1nm)作光源,按前述調(diào)整好燈的位置,調(diào)理負(fù)高壓,使透射比為1：100％，然后用儀器附帶的透光檢驗(yàn)工具或一根火柴棒插入熄滅器縫口里。當(dāng)對(duì)光棒直立在熄滅器縫口的正中心時(shí),透射比應(yīng)接近0%,否則仍需對(duì)熄滅器位置作前后調(diào)整，然后拍對(duì)光棒垂直置于縫口兩端,其透射比應(yīng)降至30%,否則應(yīng)改動(dòng)熄滅器轉(zhuǎn)角直至到達(dá)請(qǐng)求為止。當(dāng)靜態(tài)調(diào)整終了之后,若有必要,可在點(diǎn)火的狀況下,吸噴銅規(guī)范溶液,調(diào)整熄滅器的前后轉(zhuǎn)角及其高度，丈量不同位置時(shí)的吸光度。對(duì)應(yīng)予大吸光度的位置為位置,但熄滅器不應(yīng)擋光。由于不同元素的熄滅器高度是不同的，運(yùn)用時(shí)應(yīng)依據(jù)不同的元素重新調(diào)理熄滅器高度。雙光束原子吸收分光光度計(jì)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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="石油原子吸收分光光度計(jì)排行,原子吸收分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991236161257/4858141.png"></div><p style="text-indent:25px">原子吸收分光度計(jì)分析樣品優(yōu)點(diǎn)：⑴靈敏度高。采用火焰原子化方式，大多元素的靈敏度可達(dá)ppm級(jí)，少數(shù)元素可達(dá)ppb級(jí)，原子吸收分光度計(jì)若用高溫石墨爐原子化，其靈敏度可達(dá)10-10-10-14g，因此，原子吸收光譜法極適用于痕量金屬分析。⑵選擇性好。由于原子吸收線比原子發(fā)射線少得多，因此，本法的光譜干擾少，加之采用單元素制成的空芯陰極燈作銳線光源，光源輻射的光譜較純，對(duì)樣品溶液中被測(cè)元素的共振線波長處不易產(chǎn)生背景發(fā)射干擾。⑶操作方便、快速。原子吸收光譜分析與分光光度分析極為類似，其儀器結(jié)構(gòu)、原理也大致相同，原子吸收分光度計(jì)因此對(duì)于長期從事化學(xué)分析的人使用原子吸收儀器極為方便，火焰原子吸收分析的速度也較快。</p><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)槿芤海⑷芤阂造F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)元素吸收波長相同的特征譜線通過基態(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。試液提升量：提升量大小影響到靈敏度高低。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="石油原子吸收分光光度計(jì)排行,原子吸收分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991311337342/3521940.png"></div><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)安全操作須知：建議將氣瓶安裝在不受陽光直接照射的室外?？諝庠游辗止夤舛扔?jì)代理</p><p style="text-indent:25px">原子吸收分光光度計(jì)具有靈敏度高及選擇性好兩大主要優(yōu)點(diǎn)。石油原子吸收分光光度計(jì)排行</p><p style="text-indent:25px">原子吸收分光光度計(jì)的實(shí)際應(yīng)用：1、有機(jī)物分析中的應(yīng)用：利用間接法可以測(cè)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(jì)量反應(yīng)而間接測(cè)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(cè)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(cè)定。石油原子吸收分光光度計(jì)排行</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3133676.html</p></div></div></div></div></div><div id="jnrftfv" class="page-right twoColRt"><div id="dpppp93" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="9vtjzlt" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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