江西紫外可見分光光度計誠信互利上海儀電分析儀器供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="關(guān)于波長準(zhǔn)確度的檢查與校正日常在使用分光光度計時，是否要經(jīng)常進行儀器波長準(zhǔn)確度的檢查?答案是否定的。當(dāng)在日常測定中發(fā)現(xiàn)儀器測定靈敏度下降，這時才應(yīng)進行波長準(zhǔn)確度的檢查，江西紫外可見分光光度計，簡易的檢查方法(粗檢)是：儀器開機后，調(diào)節(jié)波長為"><meta name="keywords" content="江西紫外可見分光光度計,紫外可見分光光度計"><link rel="canonical" href="http://www.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> <meta name="baidu-site-verification" content="OBVzrC9aaQ" /> <meta 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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="exzg37h" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="auldz28" 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>江西紫外可見分光光度計,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-01 01:19:37</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="g78osbs" 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="7njqrs8" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="i49ypb7" class="box"><p><p style="text-indent:25px">關(guān)于波長準(zhǔn)確度的檢查與校正日常在使用分光光度計時，是否要經(jīng)常進行儀器波長準(zhǔn)確度的檢查?答案是否定的。當(dāng)在日常測定中發(fā)現(xiàn)儀器測定靈敏度下降，這時才應(yīng)進行波長準(zhǔn)確度的檢查，江西紫外可見分光光度計，簡易的檢查方法(粗檢)是：儀器開機后，調(diào)節(jié)波長為580nm，在吸收池座的通光道中插入一張白色卡片紙，若能觀察到一長方形的黃色光斑，說明波長準(zhǔn)確度屬正常范圍，否則就應(yīng)進行波長校正。當(dāng)儀器經(jīng)過長途搬運、受過機械振動或更換光源燈泡后，必須進行波長準(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，江西紫外可見分光光度計、利用氘燈的特征發(fā)射線校正法。具體步驟可參考儀器使用說明書，江西紫外可見分光光度計。紫外可見分光光度計主要由光源系統(tǒng)、單色器系統(tǒng)、樣品室、檢測系統(tǒng)組成。江西紫外可見分光光度計</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江西紫外可見分光光度計,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png"></div><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。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，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，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。實驗室紫外可見分光光度計廠家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="江西紫外可見分光光度計,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png"></div><p> 紫外可見分光光度計之比色皿的選擇與使用小技巧 </p> <p> 一直以來都認(rèn)為比色皿洗滌不干凈會造成很大實驗誤差，才發(fā)現(xiàn)原來比色皿選擇不當(dāng)也能造成不可預(yù)測的誤差。在此，就小結(jié)下有關(guān)如何正確選擇比色皿、比色皿使用注意事項以及比色皿的洗滌方法。 </p> <p> 比色皿透光面是由能夠透過所使用的波長范圍的光的材料制成。在200-350nm工作的比色皿適用于紫外區(qū),必須使用石英或熔熔硅石制成透光面的石英比色皿。(注：熔熔硅石的還真沒見過，只用過石英的)石英比色皿既可用于紫外區(qū)又可用于可見區(qū)，但是價格一般比較貴，所以要根據(jù)使用波長選擇比色皿，如果不用紫外區(qū)的話，用普通玻璃比色皿就行了，一則浪費沒必要，二則，嘿嘿，摔碎了也不心疼，哈哈。而普通硅酸鹽光學(xué)玻璃制成的透光面的比色皿,只能用于350nm至1000nm的可見區(qū)。 </p><p> 雜散光：典型值是0.01～0.05%T，在國外的產(chǎn)品中有65種產(chǎn)品的雜散光指標(biāo)在這一范圍中。雜散光超過0.05%T的產(chǎn)品有31種，小于0.01%T的產(chǎn)品有19種。。從其光學(xué)設(shè)計看，都采用了雙單色器。與掃描光柵型產(chǎn)品相比，固定光柵的分光光度計少了出射狹縫，實現(xiàn)低雜散光的難度更大。從性能指標(biāo)來看，范圍是0.01～1%T。26種固定光柵型產(chǎn)品中雜散光在0.01～0.05%T之間的有13種，也已達到半數(shù)，但是能夠低于0.01%T的很少。波長準(zhǔn)確性，國外的典型水平是0.1～1nm。國內(nèi)產(chǎn)品中，處于此范圍的有16種，基本達到同一水平，但沒有優(yōu)于0.1nm的產(chǎn)品。國內(nèi)產(chǎn)品的光度準(zhǔn)確性大多以透過率表示，水平比較接近，均在0.3～0.5%T之間。在10%T處，也就是吸光度為1A處，將光度準(zhǔn)確性以吸光度表示，則數(shù)值為0.013～0.021A。與國外產(chǎn)品有比較明顯的差距。國內(nèi)產(chǎn)品的光度重復(fù)性基本在0.1～0.3%T范圍，同樣在吸光度1A處換算，數(shù)值為0.004～0.013A，也存在距離。比較國外與國內(nèi)產(chǎn)品的雜散光的典型值，兩者幾乎相差了一個數(shù)量級。但是已有一些較新研發(fā)的產(chǎn)品，可以達到國外產(chǎn)品的普遍水準(zhǔn)。分光光度法可以得出一些化學(xué)反應(yīng)速度常數(shù)，并從兩個或兩個以上溫度條件下得到的速度數(shù)據(jù)，得出反應(yīng)活化能。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江西紫外可見分光光度計,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><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)生了分子振動能級躍遷和電子能級躍遷的結(jié)果。 </p> <p> 環(huán)境中的塵埃和腐蝕性氣體亦可以影響機械系統(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> 紫外分光光度計儀器使用一定周期后，內(nèi)部會積累一定量的塵埃，由維修工程師或在工程師指導(dǎo)下定期開啟儀器外罩對內(nèi)部進行除塵工作： </p> <p> 將各發(fā)熱元件的散熱器重新緊固，對光學(xué)盒的密封窗口進行清潔，必要時對光路進行校準(zhǔn)，對機械部分進行清潔和必要的潤滑。恢復(fù)原狀，再進行一些必要的檢測、調(diào)校與記錄。分析儀器工作者要懂得儀器的日常維護和對主要技術(shù)指標(biāo)的簡易測試方法，自己經(jīng)常對儀器進行維護和測試，以保證儀器工作在良好狀態(tài)。紫外分光光度計儀器使用一定周期后，由維修工程師或在工程師指導(dǎo)下定期開啟儀器外罩對內(nèi)部進行除塵工作。環(huán)境檢測紫外可見分光光度計多少錢</p><p style="text-indent:25px">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。江西紫外可見分光光度計</p><p> 原子吸收分光光度計與紫外可見分光光度計的區(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，而測量所需的光能量不同： </p> <p> 原子吸收為X射線，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> 紫外可見吸收為紫外光及可見光，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，原子吸收分光光度計是用較高的溫度來燃燒分子，使之原子化（變?yōu)榛鶓B(tài)原子），再通過特征輻射，把基態(tài)原子激發(fā)，并吸收能量，通過這個能量差（透過率）來計算出濃度。而紫外—可見分光光度計是通過顯色劑（一種能和我們被測元素產(chǎn)生絡(luò)合反應(yīng)的分子），與我們的被測元素產(chǎn)生反應(yīng)，并且反應(yīng)物分子帶有特定的顏色，經(jīng)過分子吸收氘燈（紫外區(qū)）或鎢燈（可見區(qū)）的照射，吸收燈發(fā)射的能量，通過能量差（透過率）來計算出濃度。江西紫外可見分光光度計</p><p style="text-indent:25px">上海儀電分析儀器有限公司專注技術(shù)創(chuàng)新和產(chǎn)品研發(fā)，發(fā)展規(guī)模團隊不斷壯大。一批專業(yè)的技術(shù)團隊，是實現(xiàn)企業(yè)戰(zhàn)略目標(biāo)的基礎(chǔ)，是企業(yè)持續(xù)發(fā)展的動力。公司以誠信為本，業(yè)務(wù)領(lǐng)域涵蓋分光光度計，氣相色譜，原子吸收，食品安全，我們本著對客戶負(fù)責(zé)，對員工負(fù)責(zé)，更是對公司發(fā)展負(fù)責(zé)的態(tài)度，爭取做到讓每位客戶滿意。一直以來公司堅持以客戶為中心、分光光度計，氣相色譜，原子吸收，食品安全市場為導(dǎo)向，重信譽，保質(zhì)量，想客戶之所想，急用戶之所急，全力以赴滿足客戶的一切需要。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1792765.html</p></div></div></div></div></div><div id="j5yypbi" class="page-right twoColRt"><div id="7nulso8" class="box01 margin10 clearfix"><h3><a 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