工業(yè)紫外可見分光光度計來電咨詢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="波長小于200nm的紫外光會被空氣吸收，只能在真空中傳播，因此稱為真空紫外(VUV)。因此，普通的UV-Vis吸收光譜儀不能測量200nm以下的信號。如果要測量VUV波段光譜，需要保持光路真空，光譜儀結(jié)構(gòu)會更加復(fù)雜，也更加昂貴。①單光束UV"><meta name="keywords" content="工業(yè)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 http-equiv="Cache-Control" content="no-transform" /> <meta 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clearfix"><h1>工業(yè)紫外可見分光光度計來電咨詢上海儀電分析儀器供應(yīng)</h1><div id="eq4fm3k" class="proBig"><div id="vj4kkhj" class="bigimg"><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 id="kysofce" 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="2rj3tka" 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>工業(yè)紫外可見分光光度計,紫外可見分光光度計</p><p><span>***更新：</span>2020-12-22 01:13:00</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="saxelni" 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="foqis8n" class="page-proshow02"><p class="title">詳細說明</p><div id="fzwyk7a" class="box"><p><p> 波長小于200nm的紫外光會被空氣吸收，只能在真空中傳播，因此稱為真空紫外(VUV)。因此，普通的UV-Vis吸收光譜儀不能測量200nm以下的信號。 </p> <p> 如果要測量VUV波段光譜，需要保持光路真空，光譜儀結(jié)構(gòu)會更加復(fù)雜，也更加昂貴。 </p> <p> ①單光束UV：傳統(tǒng)的紫外，單光源發(fā)射單光束，全程密閉，通過光柵，照射樣品，工業(yè)紫外可見分光光度計，由光電倍增管監(jiān)測器檢測。 </p> <p> 缺點：測完空白再測試樣品，全波段分析時間較長（一般2min）。 </p> <p> ②比例雙光束UV：單光源單光束，工業(yè)紫外可見分光光度計，全程密閉，通過光柵，工業(yè)紫外可見分光光度計，加入棱鏡，把光分為兩束，分別照射樣品與空白，再合并光，進入光電倍增管檢測器，通過差減法計算結(jié)果。 </p> <p> 好處：空白樣品同時檢測。 </p> <p> 缺點：靈敏度下降，全波段分析時間較長由于玻璃材質(zhì)會吸收紫外線，所以目前市面上的紫外可見分光光度計都采用石英棱鏡。工業(yè)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="工業(yè)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> <br /> </p> <p> 1靈敏度高 </p> <p> 由于新的顯色劑的大量合成，并在應(yīng)用研究方面取得了可喜的進展，使得對元素測定的靈敏度有所推進，特別是有關(guān)多元絡(luò)合物和各種表面活性劑的應(yīng)用研究，使許多元素的摩爾吸光系數(shù)由原來的幾萬提高到數(shù)十萬。 </p> <p> 2選擇性好 </p> <p> 目前已有些元素只要利用控制適當?shù)娘@色條件就可直接進行光度法測定，如鈷、鈾、鎳、銅、銀、鐵等元素的測定，已有比較滿意的方法了。 </p> <p> 3準確度高 </p> <p> 對于一般的分光光度法，其濃度測量的相對誤差在1～3%范圍內(nèi)，如采用示差分光光度法進行測量，則誤差可減少到0.X%。 </p> <p> 4適用濃度范圍廣 </p> <p> 可從常量(1%～50%)(尤其使用示差法)到痕量(10-8～10-6%)(經(jīng)預(yù)富集后)。 </p> <p> 5分析成本低、操作簡便、快速、應(yīng)用廣 </p> <p> 由于各種各樣的無機物和有機物在紫外可見區(qū)都有吸收，因此均可借此法加以測定。到目前為止，幾乎化學元素周期表上的所有元素(除少數(shù)放射性元素和惰性元素之外)均可采用此法。在國際上發(fā)表的有關(guān)分析的論文總數(shù)中，光度法約占28%，我國約占所發(fā)表論文總數(shù)的33%。紫外可見分光光度計的特點分光光度法對于分析人員來說，可以說是常用和有效的工具之一。幾乎每一個分析實驗室都離不開紫外可見分光光度計。分光光度法具有以下主要特點。工業(yè)紫外可見分光光度計光學構(gòu)造和光源、探測方法、樣品類型和數(shù)據(jù)處理等都是要考慮的因素。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="工業(yè)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/ydfx123/637396594919157259/9098588.png"></div><p> <br /> </p> <p> (1)非單色光的影響：紫外一可見分光光度訃使用連續(xù)光源和分光器分光，不可能得到真正理想的單色光；為保證在測量中能得到充分的光強，儀器必須保持一定的狹縫寬度。由狹縫射出后投射到被測物質(zhì)上的光，是一個有限寬度的譜帶——光譜通帶。隨光譜通帶寬度的增大，吸收光譜的分辨率降低，并偏離朗伯一比爾定律。 </p> <p> (2)非吸收光的影響：當來自出射狹縫的光的光譜通帶寬度大于吸收光譜譜帶時，投射在被測物質(zhì)上的光就含有非吸收光。這不僅能使靈敏度降低，且能使校準曲線向橫坐標軸彎曲而偏離朗伯一比爾定律。當以空白試劑為參比調(diào)節(jié)儀器零點時，比色皿窗材料的吸收、內(nèi)外窗面的散射以及溶劑的吸收等都被抵消，所得吸光度值完全由顯色溶液中待測離了濃度所決定。此時吸光度值與試液濃度一般呈線性關(guān)系。吸光度值與測定濃度不成直線關(guān)系，發(fā)生向下彎曲(負偏離)或向上彎曲(正偏離)的現(xiàn)象而偏離朗伯一比爾定律的主要原因如下。 </p> <p> <br /> </p> <p> <br /> </p> <p> <br /> </p><p> 使用紫外可見分光光度計時需要注意哪些方面？ </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，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)無溶劑殘留。吸收池放入樣品室時應(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、測定時除另有規(guī)定外，應(yīng)以配制供試品溶液的同批溶劑為空白對照，采用1cm石英吸收池，在規(guī)定的吸收峰±2nm以內(nèi)，測幾個點的吸收度或由儀器在規(guī)定的波長附近自動掃描測定，以核對供試品的吸收峰位置是否正確，并以吸收度MAX的波長作為測定波長，除另有規(guī)定外吸收度MAX波長應(yīng)在該品種項下規(guī)定的測定波長±2nm以內(nèi)。 </p> <p> 5、供試品應(yīng)取2份，如為對照品比較法，對照品一般也應(yīng)取2份。平行操作，每份結(jié)果對平均值的偏差應(yīng)在±0.5%以內(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，否則測得的吸收度值會偏低，狹縫寬度的選擇應(yīng)以減少狹縫寬度時供試品的吸收度不再增加為準，對于大部分被測品種，可以使用2nm縫寬。分光光度分析就是根據(jù)物質(zhì)的吸收光譜研究物質(zhì)的成分、結(jié)構(gòu)和物質(zhì)間相互作用的有效手段。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="工業(yè)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/ydfx123/637396593980700101/5381945.png"></div><p> 使用紫外可見分光光度計時需要注意哪些方面？ </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，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)無溶劑殘留。吸收池放入樣品室時應(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。 </p> <p> 測定時除另有規(guī)定外，應(yīng)以配制供試品溶液的同批溶劑為空白對照，采用1cm石英吸收池，在規(guī)定的吸收峰±2nm以內(nèi)，測幾個點的吸收度或由儀器在規(guī)定的波長附近自動掃描測定，以核對供試品的吸收峰位置是否正確，并以吸收度MAX的波長作為測定波長，除另有規(guī)定外吸收度MAX波長應(yīng)在該品種項下規(guī)定的測定波長±2nm以內(nèi)。 </p> <p> 供試品應(yīng)取2份，如為對照品比較法，對照品一般也應(yīng)取2份。平行操作，每份結(jié)果對平均值的偏差應(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，否則測得的吸收度值會偏低，狹縫寬度的選擇應(yīng)以減少狹縫寬度時供試品的吸收度不再增加為準，對于大部分被測品種，可以使用2nm縫寬。在大部分的樣品類型中，分光光度計可接受樣品孔、小玻璃管cuvette、吸漿管和微孔板。飼料紫外可見分光光度計廠家</p><p style="text-indent:25px">紫外可見光分光光度計是使用紫外光譜特點而設(shè)計制造的光學儀器。工業(yè)紫外可見分光光度計</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> 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)。工業(yè)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是一家儀器儀表、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)批準的項目，經(jīng)相關(guān)部門批準后方可開展經(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)?！疽婪毥?jīng)批準的項目，經(jīng)相關(guān)部門批準后方可開展經(jīng)營活動】的公司，致力于發(fā)展為創(chuàng)新務(wù)實、誠實可信的企業(yè)。儀電分析深耕行業(yè)多年，始終以客戶的需求為向?qū)В瑸榭蛻籼峁?**的分光光度計，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)成對用戶產(chǎn)品上的貼心，為用戶帶來良好體驗。儀電分析始終關(guān)注儀器儀表市場，以敏銳的市場洞察力，實現(xiàn)與客戶的成長共贏。</p></p><br 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