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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>材料紫外可見分光光度計多少錢,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-20 04:18:19</p><p><span id="click" >瀏覽次數(shù)：5次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="jf7lh33" 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: </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="x3ltrvj" class="page-proshow02"><p class="title">詳細說明</p><div id="75b3dhf" class="box"><p><p> 定性定量。利用特定的吸收峰，快速對待測樣品進行定性和定量分析。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，材料紫外可見分光光度計多少錢。透光率是一個物理詞匯，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用的，材料紫外可見分光光度計多少錢，可對此類原料品質(zhì)進行總體把控。 </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。以桑普實驗室這十幾年對苯氧乙醇中雜質(zhì)苯酚的測定方法改進過程為例： </p> <p> 之后建立了4-氨基安替比林比色法，可實現(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> 期間同時采用EP中紫外分光光度法，并將其進行適當(dāng)改進，作為修訂后的企標(biāo)。該方法便利快速，可實現(xiàn)50ppm以上的定量檢測。HPLC-DAD </p> <p> 近兩年，材料紫外可見分光光度計多少錢，桑普對產(chǎn)品品質(zhì)把控更嚴(yán)格，希望能實現(xiàn)幾個ppm的定量檢測。所以采用了HPLC-DAD作為企標(biāo)對其檢測。紫外光分光光度計分為單光束和雙光束兩類。單光束型主要是依賴單束光進行測量。材料紫外可見分光光度計多少錢</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="材料紫外可見分光光度計多少錢,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593893024301/8360761.png"></div><p> 我們都知道，紫外-可見分光光度計是實驗室中出鏡率相當(dāng)高的分析儀器。 </p> <p> 那么你的使用情況如何呢？ </p> <p> 你所關(guān)注紫外-可見分光光度計的哪些性能？ </p> <p> 大家都來說說吧！分光光度法是通過測定被測物質(zhì)，在特定波長處或一定波長范圍內(nèi)光的吸光度或發(fā)光強度，對該物質(zhì)進行定性和定量分析的方法。紫外-可見分光光度計是元析儀器引用新型技術(shù)，其功能強大，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)用范圍包括化工分析以及市政和工業(yè)廢水，飲用水，加工過程用水，地表水，冷卻水和鍋爐補給水等液體的分析。飼料紫外可見分光光度計排名紫外—可見分光光度計根據(jù)測定波長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定量分析法。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="材料紫外可見分光光度計多少錢,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png"></div><p> 可見分光光度計是一種常規(guī)的實驗室分析儀器?？沙Ｓ糜跓o機物、有機物的定性、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、可見分光光度計就是一把尺子一個天平，凡是有化驗、分析的地方都能用到它。那么，如何評價一臺紫外、可見分光光度計的優(yōu)劣呢? </p> <p> 要考察它的外觀。試想，一臺外型呆板、做工粗糙的儀器，怎么可能是一臺先進的儀器呢? </p> <p> 我們探討一下會對儀器的使用有很大影響的幾個重要指標(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、波長的準(zhǔn)確度和重復(fù)性 </p> <p> <br /> </p> </p><p> 色譜技術(shù)比它起步晚了二百多年，但如今的色譜儀器（氣相、液相、氣質(zhì)、液質(zhì)）占了分析界的大半壁江山。相較璀璨如星的各類的色譜儀器，紫外-可見分光光度計黯然了很多。 </p> <p> 紫外-可見分光光度計可以被更精確更高級的檢測手段所取代？可以退出“分析史”的舞臺？ </p> <p> NO！NO！NO！ </p> <p> 事實上紫外-可見分光光度計（下文簡稱紫外分光光度計），依然是“分析舞臺”的美玉，低調(diào)有內(nèi)涵，親民有價值。一起來發(fā)現(xiàn)它在日化產(chǎn)品分析中的美和價值吧。原理分子的紫外可見吸收光譜是由于分子中的某些基團吸收了紫外可見輻射光后，發(fā)生了電子能級躍遷而產(chǎn)生的吸收光譜。由于各種物質(zhì)具有各自不同的分子、原子和分子空間結(jié)構(gòu)，其吸收光能量的情況也就不會相同，因此，每種物質(zhì)都有其特有的、固定的吸收光譜曲線，可根據(jù)吸收光譜上某些特征波長處吸光度的高低判別或測定該物質(zhì)的含量，這就是分光光度定性和定量分析的基礎(chǔ)。紫外分光光度計的光柵是一系列等寬、等距離的平行狹縫，以光的衍射現(xiàn)象和干涉現(xiàn)象為基礎(chǔ)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="材料紫外可見分光光度計多少錢,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593808795839/2949755.png"></div><p> 紫外可見分光光度計條件設(shè)定 </p> <p> 在定量分析中，為了提高測定的靈敏度，入射光的波長應(yīng)選擇被測物的MAX吸收波長λmax，如果λmax有干擾，可選擇另一條靈敏度稍低、但能避免干擾的譜線，所以，適當(dāng)選擇入射光的波長，不僅能提高測定的靈敏度，還能提高測定的準(zhǔn)確度。 </p> <p> 狹縫寬度過大，入射光的單色性差；狹縫寬度太小，入射光的強減弱。狹縫寬度過大或過小均會造成靈敏度降低，選擇是產(chǎn)生MIN誤差情下的MAX狹縫。一般選用儀器的狹縫寬琶度應(yīng)小于待測樣品吸收帶的半寬度，否則測得的吸光度值會偏低，狹縫寬度的選擇應(yīng)以減少狹縫寬度時供試品的吸光度不再；加為準(zhǔn)，對于大部分被測品種，可以使用2nm縫寬。 </p> <p> 可通過控制被測物濃度或改變吸收池厚度來實現(xiàn)吸光度合理的范圍，以盡量減小測量誤差。一般吸光度盡量控制在0.1-0.8范圍。 </p> <p> 空白溶液是用來調(diào)節(jié)吸光度測量工作零點即A=0，T=100%的溶液，以消除溶液中其它基體組分以及吸收池和溶劑對入射光的反射和吸收所帶來的誤差。根據(jù)情況不同，常用空白溶液有如下幾種選擇。 </p> <p> <br /> 因為增加了測量的速度，所以雙光束分光光度計在測量一些溶液隨時間動態(tài)變化的研究中大有用處。三用紫外可見分光光度計賣價</p><p style="text-indent:25px">外可見分光光度計經(jīng)不斷改進，又出現(xiàn)自動記錄、自動打印、數(shù)字顯示、微機控制等各種類型的儀器。材料紫外可見分光光度計多少錢</p>紫外可見分光光度計的基本結(jié)構(gòu) <p> 紫外可見分光光度計的工作原理是由光源發(fā)出連續(xù)輻射光，經(jīng)單色器按波長大小色散為單色光，單色光照射到吸收池，一部分被樣品溶液吸收，未被吸收的光經(jīng)檢測器的光電管將光強度變化轉(zhuǎn)變?yōu)殡娦盘栕兓?，并?jīng)信號顯示系統(tǒng)調(diào)制放大后，顯示或打印出吸光度A（或透射比T），完成測定。 </p> <p> 一、光源 </p> <p> 光源是提供符合要求的入射光的裝置，紫外可見分光光度計可見光區(qū)常用的光源為鎢燈，紫外光區(qū)常用的光源為氫燈或氘燈。 </p> <p> 1.1．鎢燈 </p> <p> 鎢燈是常用的可見光光源，它可發(fā)射的波長為325~2500nm的連續(xù)光譜，其中適宜的使用波長范圍為320~1000nm，因此，也可用做近紅外光源。電能將鎢燈加熱到白熾時，發(fā)出的光強度在各波段的分布隨燈絲溫度而變化。燈絲的溫度取決于電源電壓。電源電壓的微小波動都會引起鎢光強度的很大變化。因此必須使用穩(wěn)壓電源供電，鎢燈工作電壓為12V，也可以使用12V的直流電源供電。鎢燈的壽命一般可達10000小時以上。 </p> <p> 目前很多光度計采用鹵鎢燈代替鎢燈，如7230G型、752PLUS型分光光度計等。鹵鎢燈具有較高的發(fā)光效率和較長的使用壽命。材料紫外可見分光光度計多少錢</p><p style="text-indent:25px">上海儀電分析儀器有限公司致力于儀器儀表，以科技創(chuàng)新實現(xiàn)***管理的追求。儀電分析作為儀器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術(shù)進出口業(yè)務(wù)?！疽婪毥?jīng)批準(zhǔn)的項目，經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營活動】儀器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術(shù)進出口業(yè)務(wù)。【依法須經(jīng)批準(zhǔn)的項目，經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營活動】的企業(yè)之一，為客戶提供良好的分光光度計，氣相色譜，原子吸收，食品安全。儀電分析不斷開拓創(chuàng)新，追求出色，以技術(shù)為先導(dǎo)，以產(chǎn)品為平臺，以應(yīng)用為重點，以服務(wù)為保證，不斷為客戶創(chuàng)造更高價值，提供更優(yōu)服務(wù)。儀電分析始終關(guān)注自身，在風(fēng)云變化的時代，對自身的建設(shè)毫不懈怠，高度的專注與執(zhí)著使儀電分析在行業(yè)的從容而自信。</p></p><br /><p>文章來源地址: 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