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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="mta2oi3" 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>化工紫外可見(jiàn)分光光度計(jì)怎么樣,紫外可見(jiàn)分光光度計(jì)</p><p><span>***更新：</span>2020-11-17 00:27:04</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="ftax7kg" 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(huà): </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(xiàn)] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="r7pr8np" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="oifh8z2" class="box"><p><p> <br /> </p> <p> 自從60年前紫外分光光度計(jì)出現(xiàn)在實(shí)驗(yàn)室的工作臺(tái)之后，已經(jīng)形成了一種能解決大部分難題的儀器，從單一波長(zhǎng)的測(cè)量到高性能多光譜的測(cè)量分析。實(shí)驗(yàn)室選擇時(shí)需要根據(jù)自己實(shí)驗(yàn)室的需要和目的用途來(lái)考慮，光學(xué)構(gòu)造和光源、探測(cè)方法、樣品類(lèi)型和數(shù)據(jù)處理等都是要考慮的因素。 </p> <p> <br /> </p> <p> 光學(xué)構(gòu)造（OPTICALCONFIGURATION） </p> <p> <br /> </p> <p> 一般來(lái)說(shuō)，紫外光分光光度計(jì)分為單光束和雙光束兩類(lèi)。顧名思義，單光束型主要是依賴(lài)單束光進(jìn)行測(cè)量。一束給定波長(zhǎng)的光通過(guò)對(duì)照物，然后再通過(guò)實(shí)際樣品溶液，就能得到吸光結(jié)果。 </p> <p> <br /> </p> <p> <br /> </p> <p> 雙光束型則是通過(guò)一個(gè)斬光輪（mirroredchopperwheel）將一束光分成兩束，分別測(cè)量對(duì)照樣品和實(shí)際樣品?？梢訫IN光漂移（lampdrift）和減少測(cè)量時(shí)間。一些雙光型光度計(jì)不利用斬光輪，而是利用一種光束分光器來(lái)代替，將一束光分成兩束平行的光然后同時(shí)測(cè)量對(duì)照樣品和目的樣品，化工紫外可見(jiàn)分光光度計(jì)怎么樣，化工紫外可見(jiàn)分光光度計(jì)怎么樣。因?yàn)樵黾恿藴y(cè)量的速度，化工紫外可見(jiàn)分光光度計(jì)怎么樣，所以雙光束分光光度計(jì)在測(cè)量一些溶液隨時(shí)間動(dòng)態(tài)變化的研究中大有用處。 </p> <p> <br /> 紫外可見(jiàn)吸收光譜是由于分子中的某些基團(tuán)吸收了紫外可見(jiàn)輻射光后，發(fā)生了電子能級(jí)躍遷而產(chǎn)生的吸收光譜?；ぷ贤饪梢?jiàn)分光光度計(jì)怎么樣</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="化工紫外可見(jiàn)分光光度計(jì)怎么樣,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592124342670/5540999.png"></div><p style="text-indent:25px">紫外分光光度計(jì)檢測(cè)器是將光信號(hào)轉(zhuǎn)變?yōu)殡娦盘?hào)的裝置。測(cè)量吸光度時(shí)，并非直接測(cè)量透過(guò)吸收池的光強(qiáng)度，而是將光強(qiáng)度轉(zhuǎn)換成電流進(jìn)行測(cè)量，這種光電轉(zhuǎn)換器件稱(chēng)為檢測(cè)器，又叫接受器。常用的檢測(cè)器有光電池、光電管、光電倍增管及光電二極管陣列檢測(cè)器等。光電池價(jià)格便宜，但長(zhǎng)時(shí)間曝光，會(huì)使靈敏度降低。光電管的靈敏度比光電池高；光電倍增管不僅靈敏度比普通光電管高，而且響應(yīng)速度快，目前中、高性能分光光度計(jì)中一般采用它作為檢測(cè)器。光電二極管陣列檢測(cè)器是紫外可見(jiàn)分光光度計(jì)檢測(cè)的一個(gè)重要進(jìn)展?；ぷ贤饪梢?jiàn)分光光度計(jì)怎么樣紫外分光光度計(jì)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="化工紫外可見(jiàn)分光光度計(jì)怎么樣,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png"></div><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> 1、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> 2、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> 3、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。 </p> <p> 4、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?xún)?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?xún)?nèi)。 </p> <p> 5、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?xún)?nèi)。 </p> <p> 6、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。<span style="display:none;"></span> </p><p> 進(jìn)行單波長(zhǎng)測(cè)量時(shí)，需要考慮朗伯比爾定律對(duì)入射光單色性的要求和測(cè)定靈敏度的要求。沒(méi)有干擾時(shí)，一般選擇在吸收峰的MAX吸收波長(zhǎng)位置處，如果有干擾，選擇在沒(méi)有干擾且吸光度變化較平緩的位置。進(jìn)行多波長(zhǎng)校正時(shí)，除盡量滿(mǎn)足單波長(zhǎng)測(cè)定的波長(zhǎng)要求外，還要求多個(gè)組分間的吸收光譜間線(xiàn)性無(wú)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(xiàn)的線(xiàn)性范圍。狹縫過(guò)大，通常會(huì)使線(xiàn)性范圍變小，特別是當(dāng)不在MAX吸收波長(zhǎng)位置測(cè)定時(shí)更是如此。狹縫過(guò)小，信噪比變差，基線(xiàn)平直度和測(cè)量數(shù)據(jù)的重復(fù)性會(huì)變差。此外，還需要考慮樣品吸收峰寬度的影響。通常單波長(zhǎng)測(cè)定時(shí)，一般選擇在MAX吸收波長(zhǎng)位置，線(xiàn)性范圍容易滿(mǎn)足，可選擇較寬的狹縫（1~2nm）多波長(zhǎng)測(cè)定時(shí)，很難同時(shí)在所有波長(zhǎng)都滿(mǎn)足線(xiàn)性范圍要求，應(yīng)選擇比較小的狹縫。在選擇紫外可見(jiàn)分光光度計(jì)之前，需要了解儀器的基礎(chǔ)構(gòu)架，有哪些地方是消耗品，有想哪些需要維修保養(yǎng)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="化工紫外可見(jiàn)分光光度計(jì)怎么樣,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><p> 原子吸收分光光度計(jì)與紫外可見(jiàn)分光光度計(jì)的區(qū)別介紹 </p> <p> 原理： </p> <p> 原子吸收觀察的是構(gòu)成物質(zhì)的元素（原子）中的電子在原子軌道中的躍遷，屬于原子吸收. </p> <p> 紫外可見(jiàn)光吸收觀察的是構(gòu)成物質(zhì)的分子中的電子在分子軌道中的躍遷，屬于分子吸收. </p> <p> 能量: </p> <p> 兩者有所同，又有所不同。定量分析的原則同，而測(cè)量所需的光能量不同： </p> <p> 原子吸收為X射線(xiàn)，能量大，可激發(fā)電子從低的原子軌道向高的原子軌道躍遷. </p> <p> 紫外可見(jiàn)吸收為紫外光及可見(jiàn)光，能量小，只能激發(fā)電子從分子軌道向MAX低（或次低）的空的分子軌道躍遷。 </p> <p> 通俗的說(shuō)，原子吸收分光光度計(jì)是用較高的溫度來(lái)燃燒分子，使之原子化（變?yōu)榛鶓B(tài)原子），再通過(guò)特征輻射，把基態(tài)原子激發(fā)，并吸收能量，通過(guò)這個(gè)能量差（透過(guò)率）來(lái)計(jì)算出濃度。而紫外—可見(jiàn)分光光度計(jì)是通過(guò)顯色劑（一種能和我們被測(cè)元素產(chǎn)生絡(luò)合反應(yīng)的分子），與我們的被測(cè)元素產(chǎn)生反應(yīng)，并且反應(yīng)物分子帶有特定的顏色，經(jīng)過(guò)分子吸收氘燈（紫外區(qū)）或鎢燈（可見(jiàn)區(qū)）的照射，吸收燈發(fā)射的能量，通過(guò)能量差（透過(guò)率）來(lái)計(jì)算出濃度。使用紫外分光光度計(jì)應(yīng)具備四季恒濕的儀器室，配置恒溫設(shè)備，特別是地處南方地區(qū)的實(shí)驗(yàn)室。直讀紫外可見(jiàn)分光光度計(jì)排行</p><p style="text-indent:25px">紫外光分光光度計(jì)分為單光束和雙光束兩類(lèi)。單光束型主要是依賴(lài)單束光進(jìn)行測(cè)量?；ぷ贤饪梢?jiàn)分光光度計(jì)怎么樣</p><p style="text-indent:25px">關(guān)于波長(zhǎng)準(zhǔn)確度的檢查與校正日常在使用分光光度計(jì)時(shí)，是否要經(jīng)常進(jìn)行儀器波長(zhǎng)準(zhǔn)確度的檢查?答案是否定的。當(dāng)在日常測(cè)定中發(fā)現(xiàn)儀器測(cè)定靈敏度下降，這時(shí)才應(yīng)進(jìn)行波長(zhǎng)準(zhǔn)確度的檢查，簡(jiǎn)易的檢查方法(粗檢)是：儀器開(kāi)機(jī)后，調(diào)節(jié)波長(zhǎng)為580nm，在吸收池座的通光道中插入一張白色卡片紙，若能觀察到一長(zhǎng)方形的黃色光斑，說(shuō)明波長(zhǎng)準(zhǔn)確度屬正常范圍，否則就應(yīng)進(jìn)行波長(zhǎng)校正。當(dāng)儀器經(jīng)過(guò)長(zhǎng)途搬運(yùn)、受過(guò)機(jī)械振動(dòng)或更換光源燈泡后，必須進(jìn)行波長(zhǎng)準(zhǔn)確度的檢查與校正。粗檢同上，其校正方法有：干涉濾光片或鐠釹濾光片校正法、利用氘燈的特征發(fā)射線(xiàn)校正法。具體步驟可參考儀器使用說(shuō)明書(shū)?；ぷ贤饪梢?jiàn)分光光度計(jì)怎么樣</p><p style="text-indent:25px">上海儀電分析儀器有限公司擁有儀器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷(xiāo)售，計(jì)算機(jī)軟件開(kāi)發(fā)及銷(xiāo)售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)?！疽婪毥?jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】?jī)x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(xiāo)售，計(jì)算機(jī)軟件開(kāi)發(fā)及銷(xiāo)售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)。【依法須經(jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】等多項(xiàng)業(yè)務(wù)，主營(yíng)業(yè)務(wù)涵蓋分光光度計(jì)，氣相色譜，原子吸收，食品安全。公司目前擁有專(zhuān)業(yè)的技術(shù)員工，為員工提供廣闊的發(fā)展平臺(tái)與成長(zhǎng)空間，為客戶(hù)提供高質(zhì)的產(chǎn)品服務(wù)，深受員工與客戶(hù)好評(píng)。誠(chéng)實(shí)、守信是對(duì)企業(yè)的經(jīng)營(yíng)要求，也是我們做人的基本準(zhǔn)則。公司致力于打造***的分光光度計(jì)，氣相色譜，原子吸收，食品安全。公司深耕分光光度計(jì)，氣相色譜，原子吸收，食品安全，正積蓄著更大的能量，向更廣闊的空間、更寬泛的領(lǐng)域拓展。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2017426.html</p></div></div></div></div></div><div id="w8l3lnr" class="page-right twoColRt"><div id="7tqce3a" 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