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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>車載紫外可見分光光度計(jì)對(duì)比,紫外可見分光光度計(jì)</p><p><span>***更新：</span>2020-11-02 00:31:41</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="kp3mdkm" 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="ey43ubi" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="sqk3a3f" class="box"><p>紫外可見分光光度計(jì)使用中常見問題解析 <p> 在一般分光光度計(jì)的使用說明書上，要求儀器預(yù)熱時(shí)間約20分鐘；若是帶微處理器的分光光度計(jì)，開機(jī)后儀器自動(dòng)進(jìn)入自檢(初始化)狀態(tài)，約需1O分鐘左右。在分光光度計(jì)預(yù)熱這個(gè)環(huán)節(jié)上，很多使用者或多或少存在問題，如開機(jī)只預(yù)熱電路系統(tǒng)(不調(diào)節(jié)波長(zhǎng)、打開吸收池暗箱蓋預(yù)熱等)或認(rèn)為初始化過程就是預(yù)熱等等。對(duì)帶微處理器有自檢功能的分光光度計(jì)，開機(jī)后儀器自檢(初始化)結(jié)束后，車載紫外可見分光光度計(jì)對(duì)比，在測(cè)定窗口上，設(shè)置所需波長(zhǎng)值，用一個(gè)吸收池裝上純凈水置于光路上，調(diào)“0000A”后，預(yù)熱儀器，車載紫外可見分光光度計(jì)對(duì)比，當(dāng)儀器顯示讀數(shù)不再變化后即可進(jìn)行測(cè)定。 </p> <p> 對(duì)于紫外可見分光光度計(jì)，由于有雙光源(鎢燈與氘燈)，為了延長(zhǎng)燈的使用壽命，車載紫外可見分光光度計(jì)對(duì)比，開機(jī)自檢完成后可以關(guān)掉測(cè)定時(shí)不用的光源燈。紫外—可見分光光度計(jì)根據(jù)測(cè)定波長(zhǎng)的范圍可分為可見分光光度定量分析法和紫外分光光度計(jì)定量分析法。車載紫外可見分光光度計(jì)對(duì)比</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="車載紫外可見分光光度計(jì)對(duì)比,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png"></div><p> 可見分光光度計(jì)是一種常規(guī)的實(shí)驗(yàn)室分析儀器。可常用于無機(jī)物、有機(jī)物的定性、定量分析中，在科研、制藥、化工、環(huán)保、衛(wèi)生、防疫等領(lǐng)域中發(fā)揮重要的作用。有人說，紫外、可見分光光度計(jì)就是一把尺子一個(gè)天平，凡是有化驗(yàn)、分析的地方都能用到它。那么，如何評(píng)價(jià)一臺(tái)紫外、可見分光光度計(jì)的優(yōu)劣呢? </p> <p> 要考察它的外觀。試想，一臺(tái)外型呆板、做工粗糙的儀器，怎么可能是一臺(tái)先進(jìn)的儀器呢? </p> <p> 我們探討一下會(huì)對(duì)儀器的使用有很大影響的幾個(gè)重要指標(biāo) </p> <p> <p> 1、光度準(zhǔn)確度 </p> <p> 2、雜散光 </p> <p> 3、光譜帶寬 </p> <p> 4、穩(wěn)定性 </p> <p> 5、噪聲 </p> <p> 6、波長(zhǎng)的準(zhǔn)確度和重復(fù)性 </p> <p> <br /> </p> 中端紫外可見分光光度計(jì)賣價(jià)紫外分光光度計(jì)可用于藥品的鑒別、純度檢查及含量測(cè)定，既可以定性分析，又可以定量分析。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="車載紫外可見分光光度計(jì)對(duì)比,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><p>光源和檢測(cè)方法（LIGHTSOURCESANDDETECTION）分光光度計(jì)的光譜也是需要考慮的一個(gè)重要因素。實(shí)驗(yàn)室研究人員希望省錢購(gòu)入專門儀器定量核酸、蛋白或者細(xì)菌的生長(zhǎng)情況。例如AmershamBiosciencesofPiscataway公司的GeneQuantII能在230、260、280、320、595和600nm的波長(zhǎng)下測(cè)量樣品。果果需要更大的靈活性，研究者可以考慮一種更高性能的寬光譜儀器，可以程序性地進(jìn)行ELISAs分析和比色分析。</p><p>紫外分光光度計(jì)一般覆蓋190nm和380nm波長(zhǎng)，通常利用氘燈照明。一些特殊的儀器可以提供滿足光子學(xué)和半導(dǎo)體研究需要的光譜范圍。VarianofPaloAlto公司的CaryDeepUV和HitachiHighTechnologiesofTokyo的U-7000AutomatedVacuumUVSystem就是這樣的儀器。</p><p>一些儀器具有多種光源供選擇：紫外光、可見光和甚至紅外光（780nm至3,000nm）。鎢燈和鹵素?zé)粢话阒桓采w可見光部分（大約380nm到800nm）。而氙燈則可以覆蓋紫外光和可見光區(qū)域。</p><p> 紫外可見分光光度計(jì)種類及優(yōu)缺點(diǎn)對(duì)比 </p> <p> <br /> </p> <p> 單光束UV：傳統(tǒng)的紫外，單光源發(fā)射單光束，全程密閉，通過光柵，照射樣品，由光電倍增管監(jiān)測(cè)器檢測(cè)。 </p> <p> 缺點(diǎn)：測(cè)完空白再測(cè)試樣品，全波段分析時(shí)間較長(zhǎng)（一般2min）。2比例雙光束UV：?jiǎn)喂庠磫喂馐?，全程密閉，通過光柵，加入棱鏡，把光分為兩束，分別照射樣品與空白，再合并光，進(jìn)入光電倍增管檢測(cè)器，通過差減法計(jì)算結(jié)果。 </p> <p> 好處：空白樣品同時(shí)檢測(cè)。 </p> <p> 缺點(diǎn)：靈敏度下降，全波段分析時(shí)間較長(zhǎng)。3雙光束UV：?jiǎn)喂庠磫喂馐堂荛]，通過棱鏡分出兩道光，分別通過一光柵，分別進(jìn)入各自的光點(diǎn)倍增管檢測(cè)器。 </p> <p> 好處：加強(qiáng)靈敏度，同時(shí)測(cè)量空白與樣品。 </p> <p> 缺點(diǎn)：全波段分析時(shí)間較長(zhǎng)。4全波段UV：?jiǎn)喂庠磫喂馐?，樣品與空白暴露在空氣中，照射樣品，開始進(jìn)入密閉箱，通過光柵，進(jìn)入DAD檢測(cè)器。 </p> <p> 好處：空白只需要檢測(cè)一次，如果你愿意一輩子檢測(cè)這一次都可以。檢測(cè)樣品不密閉，外界光線對(duì)其無影響，使用方便且精確。分析任何波段或全波段不到1s。 </p> <p> 缺點(diǎn)：貴。（25W）紫外可見分光光度計(jì)應(yīng)安裝在太陽(yáng)不能直接曬到的地方，以免“室光” 太強(qiáng)，影響儀器的使用壽命。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="車載紫外可見分光光度計(jì)對(duì)比,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png"></div><p> 定性定量。利用特定的吸收峰，快速對(duì)待測(cè)樣品進(jìn)行定性和定量分析。如聚六亞甲基雙胍鹽酸鹽的檢測(cè)。利用雙波長(zhǎng)，以很快的速度辨別是單胍還是雙胍，并進(jìn)行粗略定量。這是液相色譜無論如何也做不到的。 </p> <p> 測(cè)定透過率。透光率是一個(gè)物理詞匯，是表示光線透過介質(zhì)的的能力，是透過透明或半透明物體的光通量與其入射光通量的百分率。吸光度與透過率的換算公式 </p> <p> 透過率對(duì)于某些原料檢測(cè)是非常實(shí)用的，可對(duì)此類原料品質(zhì)進(jìn)行總體把控。 </p> <p> 雜質(zhì)的檢測(cè)。通過前處理將雜質(zhì)與主成分分離后，進(jìn)行紫外分光光度測(cè)定，可很快得到該雜質(zhì)的含量。以桑普實(shí)驗(yàn)室這十幾年對(duì)苯氧乙醇中雜質(zhì)苯酚的測(cè)定方法改進(jìn)過程為例： </p> <p> 之后建立了4-氨基安替比林比色法，可實(shí)現(xiàn)對(duì)苯氧乙醇含量20、40、60、80、100ppm的區(qū)分；紫外分光光度法 </p> <p> 期間同時(shí)采用EP中紫外分光光度法，并將其進(jìn)行適當(dāng)改進(jìn)，作為修訂后的企標(biāo)。該方法便利快速，可實(shí)現(xiàn)50ppm以上的定量檢測(cè)。HPLC-DAD </p> <p> 近兩年，桑普對(duì)產(chǎn)品品質(zhì)把控更嚴(yán)格，希望能實(shí)現(xiàn)幾個(gè)ppm的定量檢測(cè)。所以采用了HPLC-DAD作為企標(biāo)對(duì)其檢測(cè)。外可見分光光度計(jì)經(jīng)不斷改進(jìn)，又出現(xiàn)自動(dòng)記錄、自動(dòng)打印、數(shù)字顯示、微機(jī)控制等各種類型的儀器。上海紫外可見分光光度計(jì)生產(chǎn)廠家</p><p style="text-indent:25px">現(xiàn)在的許多紫外分光光度計(jì)裝的是“長(zhǎng)壽”型燈源，據(jù)說氘燈可達(dá)2000小時(shí)，鎢燈3000小時(shí)。車載紫外可見分光光度計(jì)對(duì)比</p><p> 關(guān)于吸光度測(cè)定重復(fù)性的問題分光光度計(jì)在測(cè)定過程中，發(fā)現(xiàn)同一個(gè)溶液在不同時(shí)問里其測(cè)定結(jié)果不同，即重復(fù)性不好，其原因是什么?排除測(cè)定錯(cuò)誤因素外，可能原因有：(1)儀器預(yù)熱時(shí)間不夠或預(yù)熱方法不對(duì)所造成，應(yīng)延長(zhǎng)預(yù)熱時(shí)間或采用正確的預(yù)熱方法。 </p> <p> (2)光電轉(zhuǎn)換器(如光電管)因長(zhǎng)時(shí)間使用其光電轉(zhuǎn)換效率發(fā)生了變化導(dǎo)致。這時(shí)標(biāo)準(zhǔn)溶液與待測(cè)溶液的吸光度都同樣變低，在相對(duì)定量時(shí)對(duì)結(jié)果影響很小。但是對(duì)這類儀器，一般建議連續(xù)使用時(shí)間不應(yīng)超過3h，若需長(zhǎng)時(shí)間使用，間歇30min。車載紫外可見分光光度計(jì)對(duì)比</p><p style="text-indent:25px">上海儀電分析儀器有限公司專注技術(shù)創(chuàng)新和產(chǎn)品研發(fā)，發(fā)展規(guī)模團(tuán)隊(duì)不斷壯大。一批專業(yè)的技術(shù)團(tuán)隊(duì)，是實(shí)現(xiàn)企業(yè)戰(zhàn)略目標(biāo)的基礎(chǔ)，是企業(yè)持續(xù)發(fā)展的動(dòng)力。公司以誠(chéng)信為本，業(yè)務(wù)領(lǐng)域涵蓋分光光度計(jì)，氣相色譜，原子吸收，食品安全，我們本著對(duì)客戶負(fù)責(zé)，對(duì)員工負(fù)責(zé)，更是對(duì)公司發(fā)展負(fù)責(zé)的態(tài)度，爭(zhēng)取做到讓每位客戶滿意。公司憑著雄厚的技術(shù)力量、飽滿的工作態(tài)度、扎實(shí)的工作作風(fēng)、良好的職業(yè)道德，樹立了良好的分光光度計(jì)，氣相色譜，原子吸收，食品安全形象，贏得了社會(huì)各界的信任和認(rèn)可。</p></p><br /><p>文章來源地址: 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