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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>教學(xué)紫外可見分光光度計(jì)比較,紫外可見分光光度計(jì)</p><p><span>***更新：</span>2020-11-01 02:20:32</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="yeciwsy" 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="wukyok2" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="maigkqg" class="box"><p><p> 進(jìn)行單波長測量時(shí)，需要考慮朗伯比爾定律對入射光單色性的要求和測定靈敏度的要求。沒有干擾時(shí)，一般選擇在吸收峰的MAX吸收波長位置處，如果有干擾，選擇在沒有干擾且吸光度變化較平緩的位置。進(jìn)行多波長校正時(shí)，除盡量滿足單波長測定的波長要求外，還要求多個(gè)組分間的吸收光譜間線性無關(guān)。 </p> <p> 紫外分光光度計(jì)狹縫的大小會(huì)影響到儀器的信噪比和標(biāo)準(zhǔn)曲線的線性范圍，教學(xué)紫外可見分光光度計(jì)比較。狹縫過大，通常會(huì)使線性范圍變小，教學(xué)紫外可見分光光度計(jì)比較，特別是當(dāng)不在MAX吸收波長位置測定時(shí)更是如此。狹縫過小，信噪比變差，基線平直度和測量數(shù)據(jù)的重復(fù)性會(huì)變差。此外，教學(xué)紫外可見分光光度計(jì)比較，還需要考慮樣品吸收峰寬度的影響。通常單波長測定時(shí)，一般選擇在MAX吸收波長位置，線性范圍容易滿足，可選擇較寬的狹縫（1~2nm）多波長測定時(shí)，很難同時(shí)在所有波長都滿足線性范圍要求，應(yīng)選擇比較小的狹縫。紫外可見分光光度計(jì)是實(shí)驗(yàn)室中出鏡率相當(dāng)高的分析儀器。教學(xué)紫外可見分光光度計(jì)比較</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="教學(xué)紫外可見分光光度計(jì)比較,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592124342670/5540999.png"></div><p> 光柵實(shí)現(xiàn)上就是一系列等寬、等距離的平行狹縫，它是利用光的衍射與干涉作用制成的。光柵作為色散元件具有不少獨(dú)特的優(yōu)點(diǎn)，光柵單色器的分辨率比棱鏡單色器的分辨率高，可精確到0.2nm，而且可用的波長范圍也比棱鏡單色器的范圍寬。所以，目前生產(chǎn)的紫外可見分光光度計(jì)大多采用光柵作為色散元件。 </p> <p> 吸收池是用于盛裝待測液并決定待測溶液透光液層厚度的器皿，又稱比色皿。吸收池一般為長方體，也有圓形或其它形狀的。其底及兩側(cè)為毛玻璃，另兩面為光學(xué)透光面。根據(jù)光學(xué)透光面的材質(zhì)，吸收池又可分為玻璃吸收池和石英吸收池兩種。玻璃吸收池用于可見光區(qū)測定，石英吸收池用于紫外光區(qū)的測定。吸收池的規(guī)格以光程為標(biāo)志。常用的吸收池規(guī)格有0.5cm、1.0cm、2.0cm、3.0cm、5.0cm等。環(huán)境檢測紫外可見分光光度計(jì)多少錢紫外光分光光度計(jì)分為單光束和雙光束兩類。單光束型主要是依賴單束光進(jìn)行測量。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="教學(xué)紫外可見分光光度計(jì)比較,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png"></div><p style="text-indent:25px"><p>綜合評價(jià)紫外可見光分光光度計(jì)儀器：根據(jù)使用領(lǐng)域進(jìn)行初步篩選，科研、制藥領(lǐng)域注重選擇光譜可調(diào)的紫外可見光分光光度計(jì)。其中，制藥中藥檢儀器要符合藥典規(guī)定，光譜帶寬要求為2nm以下。<p>重要性能指標(biāo)的考察，包括：光度準(zhǔn)確度，雜散光，光譜帶寬，穩(wěn)定性，噪聲，波長的準(zhǔn)確度和重復(fù)性是幾個(gè)重要指標(biāo)。各指標(biāo)間相互獨(dú)立有相互影響，需要綜合考量選購目標(biāo)紫外可見光分光光度計(jì)。<p>使用前，閱讀儀器使用說明書和做好儀器使用前的工程師培訓(xùn)。使用過程中，正確操作、認(rèn)真了解儀器指標(biāo)的物理意義和測試方法以及結(jié)合儀器使用中的相關(guān)設(shè)備的調(diào)試。掌握儀器的基本保養(yǎng)維護(hù)知識，建立相關(guān)指標(biāo)與分析測試結(jié)果之間的誤差影響條件，經(jīng)常檢測和調(diào)試儀器，確保儀器處在合適的工作狀態(tài)。</p><p> 紫外-可見分光光度計(jì)（UV）引用新型技術(shù)，其功能強(qiáng)大，采用單色器技術(shù)，波長范圍190-1100nm，是各種涉及水和廢水分析領(lǐng)域的通用儀器，應(yīng)用范圍包括市政和工業(yè)廢水，飲用水，加工過程用水，地表水，冷卻水和鍋爐補(bǔ)給水等。 </p> <p> 在水和廢水監(jiān)測中的應(yīng)用，對于一個(gè)水系的監(jiān)測分析和綜合評價(jià)，一般包括水相（溶液本身）、固相（懸浮物、底質(zhì)）、生物相（水生生物）。在水質(zhì)的常規(guī)監(jiān)測中，紫外可見分光光度法占有較大的比重。由于水和廢水的成分復(fù)雜多變，待測物的濃度和干擾物的濃度差別很大，在具體分析時(shí)必須選擇好分析方法。 </p> <p> 在農(nóng)產(chǎn)品和食品分析中可用于檢測的組分或成分有蛋白質(zhì)、賴氨酸、葡萄糖、維生素C、硝酸鹽、亞硝酸鹽、砷、汞等; </p> <p> 在植物生化分析中可用于檢測葉綠素、全氮和酶的活力等； </p> <p> 在飼料分析中可用于檢測煙酸、棉酚、磷化氫和甲酯等。原理紫外可見吸收光譜主要產(chǎn)生于分子價(jià)電子在能級間的躍遷。利用一定頻率的紫外--可見光照射被分析的物質(zhì)，引起分子中價(jià)電子的躍遷，它將有選擇地被吸收。吸收光譜可以反映出物質(zhì)的特征。它對物質(zhì)進(jìn)行定性分析、定量分析及結(jié)構(gòu)分析,所依據(jù)的光譜是分子或離子吸收入射光中特定波長的光而產(chǎn)生的吸收光譜。分光光度計(jì)的鎢燈壽命無法延長，氘燈如果不用的時(shí)候，可以關(guān)閉，開機(jī)要預(yù)熱時(shí)間。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="教學(xué)紫外可見分光光度計(jì)比較,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png"></div><p style="text-indent:25px">紫外可見分光光度計(jì)的展望紫外可見分光光度計(jì)雖然是一類有著很長歷史的分析儀器，但每一次吸收了新的技術(shù)成果都使它煥發(fā)出新的活力。掃描光柵型分光光度計(jì)依托成熟的設(shè)計(jì)制造工藝，并結(jié)合計(jì)算機(jī)控制等新的技術(shù)成果，仍有很強(qiáng)的生命力。在很多方面，掃描型產(chǎn)品仍體現(xiàn)了技術(shù)水平。陣列式探測器的產(chǎn)生直接促成了固定光柵分光光度計(jì)的設(shè)計(jì)，使得它在測量地更快、更穩(wěn)定、適應(yīng)性更強(qiáng)的方向邁出了一大步。并且，從今后的發(fā)展來看，儀器的小型化、在線化，測量的現(xiàn)場化、實(shí)時(shí)化將是一大方向。要使分光光度計(jì)走出實(shí)驗(yàn)室，成為一種應(yīng)用更廣，更為普及的測量分析設(shè)備，陣列式探測器以及其它的固態(tài)式設(shè)計(jì)可發(fā)揮重要的作用。光纖也將是其中的一項(xiàng)重要技術(shù)，它已使得紫外可見分光光度計(jì)的使用變得更方便，同時(shí)也使分光光度計(jì)的配置變得更靈活。光纖結(jié)合模塊化設(shè)計(jì)，可能使得分光光度計(jì)可以突破完全固定、靜態(tài)的組成，而變成可以自由搭配，自助式構(gòu)建的儀器。光纖同時(shí)也是實(shí)現(xiàn)在線測量的重要手段。計(jì)算機(jī)技術(shù)的影響將更為增進(jìn)。分光光度計(jì)的自動(dòng)化、智能化是一個(gè)方面。另一方面，軟件已經(jīng)在一定程度上使實(shí)在的儀器接近了虛擬的程序，網(wǎng)絡(luò)和信息技術(shù)的結(jié)合可能帶來進(jìn)一步的影響。在操作紫外可見分光光度計(jì)時(shí)，操作人員需要留意一下機(jī)器的干燥劑。教學(xué)紫外可見分光光度計(jì)比較</p><p style="text-indent:25px">分光光度計(jì)元器件方面，經(jīng)歷了棱鏡、機(jī)刻光柵和全息光柵，商品化的全息閃耀光柵已迅速取代一般刻劃光柵。教學(xué)紫外可見分光光度計(jì)比較</p><p> 定性定量。利用特定的吸收峰，快速對待測樣品進(jìn)行定性和定量分析。如聚六亞甲基雙胍鹽酸鹽的檢測。利用雙波長，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> 透過率對于某些原料檢測是非常實(shí)用的，可對此類原料品質(zhì)進(jìn)行總體把控。 </p> <p> 雜質(zhì)的檢測。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)室這十幾年對苯氧乙醇中雜質(zhì)苯酚的測定方法改進(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。HPLC-DAD </p> <p> 近兩年，桑普對產(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。所以采用了HPLC-DAD作為企標(biāo)對其檢測。教學(xué)紫外可見分光光度計(jì)比較</p><p style="text-indent:25px">上海儀電分析儀器有限公司是一家生產(chǎn)型類企業(yè)，積極探索行業(yè)發(fā)展，努力實(shí)現(xiàn)產(chǎn)品創(chuàng)新。公司致力于為客戶提供安全、質(zhì)量有保證的良好產(chǎn)品及服務(wù)，是一家有限責(zé)任公司企業(yè)。公司始終堅(jiān)持客戶需求優(yōu)先的原則，致力于提供高質(zhì)量的分光光度計(jì)，氣相色譜，原子吸收，食品安全。儀電分析自成立以來，一直堅(jiān)持走正規(guī)化、專業(yè)化路線，得到了廣大客戶及社會(huì)各界的普遍認(rèn)可與大力支持。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1793930.html</p></div></div></div></div></div><div id="kwu420k" class="page-right twoColRt"><div id="usi4gui" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="agu4mao" 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(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)</p></a></div><div id="cqwu2kg" class="recomPic likePro"><a 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