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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="vzrjvhj" 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>低端紫外可見分光光度計(jì)選擇,紫外可見分光光度計(jì)</p><p><span>***更新：</span>2020-12-23 01:14:32</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="mbylnuw" 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="kzm7ian" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="3md7pr8" class="box"><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(jì)黯然了很多。 </p> <p> 事實(shí)上紫外-可見分光光度計(jì)（下文簡稱紫外分光光度計(jì)），依然是“分析舞臺(tái)”的美玉，低調(diào)有內(nèi)涵，親民有價(jià)值。一起來發(fā)現(xiàn)它在日化產(chǎn)品分析中的美和價(jià)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(tuán)吸收了紫外可見輻射光后，發(fā)生了電子能級(jí)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(huì)相同，因此，每種物質(zhì)都有其特有的、固定的吸收光譜曲線，低端紫外可見分光光度計(jì)選擇，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(cè)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)，低端紫外可見分光光度計(jì)選擇，低端紫外可見分光光度計(jì)選擇。大部分單機(jī)型的分光光度計(jì)包含了驅(qū)動(dòng)儀器運(yùn)行和管理數(shù)據(jù)的軟件。與PC機(jī)一起聯(lián)用，需要從制造商購買軟件。低端紫外可見分光光度計(jì)選擇</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="低端紫外可見分光光度計(jì)選擇,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593139440396/4585287.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，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> 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 </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)。 </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。低端紫外可見分光光度計(jì)選擇紫外分光光度計(jì)一般覆蓋190nm和380nm波長，通常利用氘燈照明。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="低端紫外可見分光光度計(jì)選擇,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png"></div><p> 波長的準(zhǔn)確性：*有16種偏差超過1nm，其余大多在01～1之間。其中突出的是Varian的Cary100/300，它們?cè)?561nm處的波長準(zhǔn)確性達(dá)到了002nm的水平。波長重復(fù)性大于05nm的*7種，01～05nm之間的占了多數(shù)，共有68種，還有相當(dāng)數(shù)量的產(chǎn)品達(dá)到了優(yōu)于01nm的水平。如Agilent的8453(002)、Beckman的DU7000series(005)、Camspec的M400T/PC(005)、GBC的Centra10/20/40(004)、Hitachi的U3010/3310(005)、PerkinElmer的Lambda系列(002～005)、ScincoCO的S-1100/3130/3150(002)、Shimadzu的MS1500(001)和UV1201(003)、Varian的Cary系列(0008～0025)等。雖然從原理上，固定光柵型的設(shè)計(jì)結(jié)構(gòu)固定、簡單，易于實(shí)現(xiàn)好的波長準(zhǔn)確性和重復(fù)性，但掃描光柵的設(shè)計(jì)制造工藝已十分成熟。光譜范圍紫外可見光譜區(qū)通常指190nm～780nm的波長范圍，但實(shí)際的分光光度計(jì)設(shè)計(jì)中，經(jīng)常將波長向長波方向拓展，進(jìn)入短波近紅外區(qū)。在120多種國外產(chǎn)品中，有52種波長≤900nm，其中≤800nm的*11種。而>900nm的有72種，占了多數(shù)。固定光柵型受硅陣列探測(cè)器的限制，1100nm是其波長的上限。掃描光柵型使用分立光電器件，波長的擴(kuò)展更為靈活。 </p> <p> <br /> </p><p> 在使用紫外可見分光光度計(jì)時(shí)候，設(shè)備儀器使用之前，一定需要能夠把樣品室內(nèi)存放的防潮劑給拿出來，且在設(shè)備正常運(yùn)轉(zhuǎn)檢查時(shí)候也不能開啟樣品室蓋；在檢查時(shí)候需注意比色皿當(dāng)中的液體要能占總體積的百分之六十六到百分之八十比較好，千萬不能讓液體太多以至于液體外泄直接腐蝕儀器設(shè)備。 </p> <p> 當(dāng)然在進(jìn)行正常檢測(cè)時(shí)候，也要能確保比色皿干凈，當(dāng)發(fā)現(xiàn)內(nèi)壁上有液滴就許使用專業(yè)的紙張給擦拭干凈，建議大家千萬不要使用手直接擦拭，以免造成對(duì)手的傷害。 </p> <p> 在使用紫外可見分光光度計(jì)時(shí)，儀器設(shè)備在正常運(yùn)轉(zhuǎn)的時(shí)候，一定要嚴(yán)禁把液體溶劑給直接放置于儀器的表層上，如果發(fā)現(xiàn)有溶劑液體出現(xiàn)外泄的情況，一定要進(jìn)行及時(shí)的清潔和處理。 </p> <p> 當(dāng)使用紫外可見分光光度計(jì)檢測(cè)完畢后，還需要能夠及時(shí)把比色皿內(nèi)的液體給妥善處理掉，并還需要能夠使用蒸餾水給徹底清潔干凈，同時(shí)將比色皿進(jìn)行倒置晾干處理；全部工作完成后還需把設(shè)備儀器電源給關(guān)閉，再將防潮劑放入到樣品室內(nèi)并做好防塵處理才好。在分光光度計(jì)的使用或檢定中,透射比(吸光度)的準(zhǔn)確度直接關(guān)系到所測(cè)數(shù)據(jù)的可信性及科學(xué)性。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="低端紫外可見分光光度計(jì)選擇,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.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)可以在紫外可見光區(qū)任意選擇不同波長的光。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-可見分光光度法是利用某些物質(zhì)的分子吸收200--800nm光譜區(qū)的輻射來進(jìn)行分析測(cè)定的方法。常見紫外可見分光光度計(jì)性價(jià)比</p><p style="text-indent:25px">紫外—可見分光光度計(jì)根據(jù)測(cè)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(jì)定量分析法。低端紫外可見分光光度計(jì)選擇</p><p> 紫外可見分光光度計(jì)的結(jié)構(gòu)一般地，紫外可見分光光度計(jì)主要由光源系統(tǒng)、單色器系統(tǒng)、樣品室、檢測(cè)系統(tǒng)組成，如圖1所示。光源發(fā)出的復(fù)合光通過單色器被分解成單色光，當(dāng)單色光通過樣品室時(shí)，一部分被樣品吸收，其余未被吸收的光到達(dá)檢測(cè)器，被轉(zhuǎn)變?yōu)殡娦盘?hào)，經(jīng)電子電路的放大和數(shù)據(jù)處理后，通過顯示系統(tǒng)給出測(cè)量結(jié)果。紫外可見分光光度計(jì)的軟件功能可以極大地提升儀器的使用性能和價(jià)值，現(xiàn)代分光光度計(jì)生產(chǎn)廠商都非常重視儀器配套軟件的開發(fā)。除了儀器控制軟件和通用數(shù)據(jù)分析處理軟件外，很多儀器針對(duì)不同行業(yè)應(yīng)用開發(fā)了**分析軟件，給儀器使用者帶來了極大的便利。 </p> <p> <br /> 低端紫外可見分光光度計(jì)選擇</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(shí)現(xiàn)***管理的追求。儀電分析擁有一支經(jīng)驗(yàn)豐富、技術(shù)創(chuàng)新的專業(yè)研發(fā)團(tuán)隊(duì)，以高度的專注和執(zhí)著為客戶提供分光光度計(jì)，氣相色譜，原子吸收，食品安全。儀電分析致力于把技術(shù)上的創(chuàng)新展現(xiàn)成對(duì)用戶產(chǎn)品上的貼心，為用戶帶來良好體驗(yàn)。儀電分析創(chuàng)始人湯志東，始終關(guān)注客戶，創(chuàng)新科技，竭誠為客戶提供良好的服務(wù)。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2517824.html</p></div></div></div></div></div><div id="qtfc32v" class="page-right twoColRt"><div id="jdqsk8e" class="box01 margin10 clearfix"><h3><a 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