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id="22kqoeg" 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>國(guó)內(nèi)紫外可見(jiàn)分光光度計(jì)廠家供應(yīng),紫外可見(jiàn)分光光度計(jì)</p><p><span>***更新：</span>2020-12-27 02:15:14</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="sgouk2i" 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="yekigmi" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="ae2qw2u" class="box"><p><p> 分光光度計(jì)是杜包斯克(Duboscq)和奈斯勒(Nessler)等人在1854年將朗伯-比爾(Lambert-Beer)定律應(yīng)用于定量分析化學(xué)領(lǐng)域，并且設(shè)計(jì)了第1臺(tái)比色計(jì)。到1918年，美國(guó)國(guó)家標(biāo)準(zhǔn)局制成了第1臺(tái)紫外可見(jiàn)分光光度計(jì)。此后，紫外可見(jiàn)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，使光度法的靈敏度和準(zhǔn)確度也不斷提高，其應(yīng)用范圍也不斷擴(kuò)大。紫外可見(jiàn)分光光度法從問(wèn)世以來(lái)，在應(yīng)用方面有了很大的發(fā)展，尤其是在相關(guān)學(xué)科發(fā)展的基礎(chǔ)上，促使分光光度計(jì)儀器的不斷創(chuàng)新，功能更加齊全，使得光度法的應(yīng)用更拓寬了范圍。目前，分光光度法已為工農(nóng)業(yè)各個(gè)部門(mén)和科學(xué)研究的各個(gè)領(lǐng)域所采用，成為人們從事生產(chǎn)和科研的有力測(cè)試手段。目前市場(chǎng)上有兩類主流產(chǎn)品:掃描光柵式分光光度計(jì)和固定光柵式分光光度計(jì)。 </p> <p> 什么是紫外可見(jiàn)分光光度計(jì)？紫外可見(jiàn)分光光度計(jì)是一類很重要的分析儀器，無(wú)論在物理學(xué)、化學(xué)、生物學(xué)、醫(yī)學(xué)、材料學(xué)，國(guó)內(nèi)紫外可見(jiàn)分光光度計(jì)廠家供應(yīng)，國(guó)內(nèi)紫外可見(jiàn)分光光度計(jì)廠家供應(yīng)、環(huán)境科學(xué)等科學(xué)研究領(lǐng)域，國(guó)內(nèi)紫外可見(jiàn)分光光度計(jì)廠家供應(yīng)，還是在化工、醫(yī)藥、環(huán)境檢測(cè)、冶金等現(xiàn)代化生產(chǎn)與管理部門(mén)，紫外可見(jiàn)分光光度計(jì)都有重要的應(yīng)用。金屬離子常與有機(jī)物形成絡(luò)合物，多數(shù)絡(luò)合物在紫外可見(jiàn)區(qū)是有吸收的，我們可以利用分光光度法來(lái)研究其組成。國(guó)內(nèi)紫外可見(jiàn)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="國(guó)內(nèi)紫外可見(jiàn)分光光度計(jì)廠家供應(yīng),紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593808795839/2949755.png"></div><p style="text-indent:25px">玻璃吸收池用于可見(jiàn)光區(qū)測(cè)定，石英吸收池用于紫外光區(qū)的測(cè)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。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(zhǎng)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(jiàn)分光光度計(jì)大多采用光柵作為色散元件。吸收池是用于盛裝待測(cè)液并決定待測(cè)溶液透光液層厚度的器皿，又稱比色皿。吸收池一般為長(zhǎng)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。中國(guó)紫外可見(jiàn)分光光度計(jì)對(duì)比紫外可見(jiàn)分光光度計(jì)，可以通過(guò)更換光源分別形成可見(jiàn)和紫外光區(qū)，測(cè)定的波長(zhǎng)在200～1000nm。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國(guó)內(nèi)紫外可見(jiàn)分光光度計(jì)廠家供應(yīng),紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png"></div><p> 棱鏡單色器是利用不同波長(zhǎng)的光在棱鏡內(nèi)折射率不同將復(fù)合光色散為單色光，這種現(xiàn)象稱為棱鏡的色散作用。常用的棱鏡由玻璃或石英制成。可見(jiàn)光范圍常采用玻璃棱鏡，其色散力強(qiáng)，價(jià)格低廉，但是玻璃吸收紫外光，所以不宜用于紫外光區(qū)。紫外光范圍常用石英作為材料，石英棱鏡的工作波長(zhǎng)范圍為185~4000nm，在紫外光區(qū)有較好的分辨力，而且也適用于可見(jiàn)光區(qū)和近紅外光區(qū)。棱鏡單色器的特點(diǎn)是波長(zhǎng)越短，色散程度越好。越趨向長(zhǎng)波，色散程度越差，所以，單色器用棱鏡的分光光度計(jì)，其波長(zhǎng)刻度在紫外光區(qū)可達(dá)到0.2nm，而在長(zhǎng)波段，只能達(dá)到5nm。紫外分光光度計(jì)的單色器是將光源發(fā)出的連續(xù)光譜分解成單色光，并能準(zhǔn)確方便地“取出”所需要的某一波長(zhǎng)的光的光學(xué)裝置，它是光度計(jì)的心臟。單色器主要由狹縫、色散元件和透鏡系統(tǒng)組成。其中色散元件是單色器的主要部件。常用的色散元件是棱鏡、光柵，或者是兩者的組合。 </p> <p> <br /> </p><p> 測(cè)定時(shí)除另有規(guī)定外，應(yīng)以配制供試品溶液的同批溶劑為空白對(duì)照，采用1cm石英吸收池，在規(guī)定的吸收峰±2nm以內(nèi)，測(cè)幾個(gè)點(diǎn)的吸收度或由儀器在規(guī)定的波長(zhǎng)附近自動(dòng)掃描測(cè)定，以核對(duì)供試品的吸收峰位置是否正確，并以吸收度MAX的波長(zhǎng)作為測(cè)定波長(zhǎng)，除另有規(guī)定外吸收度MAX波長(zhǎng)應(yīng)在該品種項(xiàng)下規(guī)定的測(cè)定波長(zhǎng)±2nm以內(nèi)。 </p> <p> 供試品應(yīng)取2份，如為對(duì)照品比較法，對(duì)照品一般也應(yīng)取2份。平行操作，每份結(jié)果對(duì)平均值的偏差應(yīng)在±0.5%以內(nèi)。 </p> <p> 選用儀器的狹縫寬度應(yīng)小于供試品吸收帶的半寬度，否則測(cè)得的吸收度值會(huì)偏低，狹縫寬度的選擇應(yīng)以減少狹縫寬度時(shí)供試品的吸收度不再增加為準(zhǔn)，對(duì)于大部分被測(cè)品種，可以使用2nm縫寬。 </p> <p> 使用紫外可見(jiàn)分光光度計(jì)時(shí)需要注意哪些方面？ </p> <p> 使用的吸收池必須潔凈，并注意配對(duì)使用。量瓶、移液吸管均應(yīng)校正、洗凈后使用。 </p> <p> 取吸收池時(shí)，手指應(yīng)拿毛玻璃面的兩側(cè)，裝盛樣品以池體的4/5為度，使用揮發(fā)性溶液時(shí)應(yīng)加蓋，透光面要用擦鏡紙由上而下擦拭干凈，檢視應(yīng)無(wú)溶劑殘留。吸收池放入樣品室時(shí)應(yīng)注意方向相同。用后用溶劑或水沖洗干凈，晾干防塵保存。 </p> <p> 供試品溶液濃度除各該品種已有注明外，其吸收度以在0.3～0.7之間為宜。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(cè)量。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國(guó)內(nèi)紫外可見(jiàn)分光光度計(jì)廠家供應(yīng),紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592124342670/5540999.png"></div><p> <p> 環(huán)境中的塵埃和腐蝕性氣體亦可以影響機(jī)械系統(tǒng)的靈活性、降低各種限位開(kāi)關(guān)、按鍵、光電偶合器的可靠性，也是造成必須學(xué)部件鋁膜銹蝕的原因之一： </p> <p> 紫外分光光度計(jì)儀器使用一定周期后，內(nèi)部會(huì)積累一定量的塵埃，由維修工程師或在工程師指導(dǎo)下定期開(kāi)啟儀器外罩對(duì)內(nèi)部進(jìn)行除塵工作： </p> <p> 將各發(fā)熱元件的散熱器重新緊固，對(duì)光學(xué)盒的密封窗口進(jìn)行清潔，必要時(shí)對(duì)光路進(jìn)行校準(zhǔn)，對(duì)機(jī)械部分進(jìn)行清潔和必要的潤(rùn)滑。恢復(fù)原狀，再進(jìn)行一些必要的檢測(cè)、調(diào)校與記錄。分析儀器工作者要懂得儀器的日常維護(hù)和對(duì)主要技術(shù)指標(biāo)的簡(jiǎn)易測(cè)試方法，自己經(jīng)常對(duì)儀器進(jìn)行維護(hù)和測(cè)試，以保證儀器工作在良好狀態(tài)。 </p> 紫外分光光度法是根據(jù)物質(zhì)的吸收光譜，來(lái)研究物質(zhì)的成分、結(jié)構(gòu)和物質(zhì)間相互作用的有效手段。紫外分光光度計(jì)可以在紫外可見(jiàn)光區(qū)任意選擇不同波長(zhǎng)的光。物質(zhì)的吸收光譜就是物質(zhì)中的分子和原子吸收了入射光中的某些特定波長(zhǎng)的光能量，相應(yīng)地發(fā)生了分子振動(dòng)能級(jí)躍遷和電子能級(jí)躍遷的結(jié)果。 </p> <p> <br /> 紫外分光光度計(jì)的帶寬（bandwidth）很大程度上依賴于單色儀的狹縫的寬度。分析紫外可見(jiàn)分光光度計(jì)生產(chǎn)廠家</p><p style="text-indent:25px">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。國(guó)內(nèi)紫外可見(jiàn)分光光度計(jì)廠家供應(yīng)</p><p> 紫外可見(jiàn)分光光度法中的透光率標(biāo)尺放大倍數(shù)，因?yàn)楦邼舛鹊臉悠吠腹饴屎苄?，引起較大的透光率讀數(shù)誤差，而示差分光光度法采用比 </p> <p> 試樣濃度較低的標(biāo)準(zhǔn)溶液作參比溶液，使透光率的讀數(shù)標(biāo)尺放大，其讀數(shù)在透光率的適宜范圍（15%~65%）內(nèi)，可提高測(cè)定準(zhǔn)確度。 </p> <p> 可能是通過(guò)吸收定律以及透光率和吸光度的轉(zhuǎn)化來(lái)計(jì)算。棱鏡根據(jù)波長(zhǎng)將光彎曲至不同程度，可將陽(yáng)光分離成可見(jiàn)光的組成顏色。波長(zhǎng)是光波相鄰峰（或谷）之間的距離，可以以米，厘米或納米（10-9米）表示。頻率是每單位時(shí)間經(jīng)過(guò)固定波的周期數(shù)，通常以每秒周期或赫茲（Hz）的形式表示?？梢?jiàn)波長(zhǎng)約400-800nm范圍內(nèi)。長(zhǎng)的可見(jiàn)波長(zhǎng)是紅色，短的是紫色。國(guó)內(nèi)紫外可見(jiàn)分光光度計(jì)廠家供應(yīng)</p><p style="text-indent:25px">上海儀電分析儀器有限公司位于徐塘路88號(hào)7幢4層、9幢。儀電分析致力于為客戶提供良好的分光光度計(jì)，氣相色譜，原子吸收，食品安全，一切以用戶需求為中心，深受廣大客戶的歡迎。公司秉持誠(chéng)信為本的經(jīng)營(yíng)理念，在儀器儀表深耕多年，以技術(shù)為先導(dǎo)，以自主產(chǎn)品為重點(diǎn)，發(fā)揮人才優(yōu)勢(shì)，打造儀器儀表良好品牌。儀電分析立足于全國(guó)市場(chǎng)，依托強(qiáng)大的研發(fā)實(shí)力，融合前沿的技術(shù)理念，飛快響應(yīng)客戶的變化需求。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2577606.html</p></div></div></div></div></div><div id="g4eqwkq" class="page-right twoColRt"><div id="ioc4iy4" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="ykiyu4m" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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