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id="pcti28v" class="proBig"><div id="ngn9nuo" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="zszypls" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="h8lx792" 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>元素紫外可見分光光度計報價,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-07 09:25:37</p><p><span id="click" >瀏覽次數(shù)：3次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="cgcmn22" 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="9ijls8x" class="page-proshow02"><p class="title">詳細說明</p><div id="8xopb7t" class="box"><p>紫外可見分光光度計使用中常見問題解析 <p> 在一般分光光度計的使用說明書上，要求儀器預(yù)熱時間約20分鐘；若是帶微處理器的分光光度計，開機后儀器自動進入自檢(初始化)狀態(tài)，約需1O分鐘左右。在分光光度計預(yù)熱這個環(huán)節(jié)上，很多使用者或多或少存在問題，如開機只預(yù)熱電路系統(tǒng)(不調(diào)節(jié)波長、打開吸收池暗箱蓋預(yù)熱等)或認為初始化過程就是預(yù)熱等等。對帶微處理器有自檢功能的分光光度計，開機后儀器自檢(初始化)結(jié)束后，在測定窗口上，設(shè)置所需波長值，用一個吸收池裝上純凈水置于光路上，調(diào)“0000A”后，預(yù)熱儀器，元素紫外可見分光光度計報價，當(dāng)儀器顯示讀數(shù)不再變化后即可進行測定。 </p> <p> 對于紫外可見分光光度計，由于有雙光源(鎢燈與氘燈)，元素紫外可見分光光度計報價，元素紫外可見分光光度計報價，為了延長燈的使用壽命，開機自檢完成后可以關(guān)掉測定時不用的光源燈。通常我們所理解的單色光，只是存于理想狀態(tài)下，實際上得到的“單色光”，是帶有一定寬度和波長范圍的譜帶。元素紫外可見分光光度計報價</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="元素紫外可見分光光度計報價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png"></div><p> 我們都知道，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。 </p> <p> 那么你的使用情況如何呢？ </p> <p> 你所關(guān)注紫外-可見分光光度計的哪些性能？ </p> <p> 大家都來說說吧！分光光度法是通過測定被測物質(zhì)，在特定波長處或一定波長范圍內(nèi)光的吸光度或發(fā)光強度，對該物質(zhì)進行定性和定量分析的方法。紫外-可見分光光度計是元析儀器引用新型技術(shù)，其功能強大，采用單色器技術(shù)，波長范圍190-1100nm，是各種涉及水和廢水分析領(lǐng)域的通用儀器，應(yīng)用范圍包括化工分析以及市政和工業(yè)廢水，飲用水，加工過程用水，地表水，冷卻水和鍋爐補給水等液體的分析。元素紫外可見分光光度計報價為了選擇合適的狹縫寬度，應(yīng)以減少狹縫寬度時紫外分光光度計試樣的吸光度不再增加為準(zhǔn)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="元素紫外可見分光光度計報價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png"></div><p> 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。 </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(dāng)?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(zhǔn)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(xué)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%。 </p>紫外可見分光光度計的基本結(jié)構(gòu) <p> 紫外可見分光光度計的工作原理是由光源發(fā)出連續(xù)輻射光，經(jīng)單色器按波長大小色散為單色光，單色光照射到吸收池，一部分被樣品溶液吸收，未被吸收的光經(jīng)檢測器的光電管將光強度變化轉(zhuǎn)變?yōu)殡娦盘栕兓?，并?jīng)信號顯示系統(tǒng)調(diào)制放大后，顯示或打印出吸光度A（或透射比T），完成測定。 </p> <p> 一、光源 </p> <p> 光源是提供符合要求的入射光的裝置，紫外可見分光光度計可見光區(qū)常用的光源為鎢燈，紫外光區(qū)常用的光源為氫燈或氘燈。 </p> <p> 1.1．鎢燈 </p> <p> 鎢燈是常用的可見光光源，它可發(fā)射的波長為325~2500nm的連續(xù)光譜，其中適宜的使用波長范圍為320~1000nm，因此，也可用做近紅外光源。電能將鎢燈加熱到白熾時，發(fā)出的光強度在各波段的分布隨燈絲溫度而變化。燈絲的溫度取決于電源電壓。電源電壓的微小波動都會引起鎢光強度的很大變化。因此必須使用穩(wěn)壓電源供電，鎢燈工作電壓為12V，也可以使用12V的直流電源供電。鎢燈的壽命一般可達10000小時以上。 </p> <p> 目前很多光度計采用鹵鎢燈代替鎢燈，如7230G型、752PLUS型分光光度計等。鹵鎢燈具有較高的發(fā)光效率和較長的使用壽命。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="元素紫外可見分光光度計報價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593808795839/2949755.png"></div><p> 光譜范圍紫外可見光譜區(qū)通常指190nm～780nm的波長范圍，但實際的分光光度計設(shè)計中，經(jīng)常將波長向長波方向拓展，進入短波近紅外區(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，波長的擴展更為靈活。 </p> <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，它們在6561nm處的波長準(zhǔn)確性達到了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)計結(jié)構(gòu)固定、簡單，易于實現(xiàn)好的波長準(zhǔn)確性和重復(fù)性，但掃描光柵的設(shè)計制造工藝已十分成熟。分光光度計的鎢燈壽命無法延長，氘燈如果不用的時候，可以關(guān)閉，開機要預(yù)熱時間。可靠紫外可見分光光度計選擇</p><p style="text-indent:25px">外可見分光光度計經(jīng)不斷改進，又出現(xiàn)自動記錄、自動打印、數(shù)字顯示、微機控制等各種類型的儀器。元素紫外可見分光光度計報價</p><p> 紫外可見分光光度計條件設(shè)定 </p> <p> 在定量分析中，為了提高測定的靈敏度，入射光的波長應(yīng)選擇被測物的MAX吸收波長λmax，如果λmax有干擾，可選擇另一條靈敏度稍低、但能避免干擾的譜線，所以，適當(dāng)選擇入射光的波長，不*能提高測定的靈敏度，還能提高測定的準(zhǔn)確度。 </p> <p> 狹縫寬度過大，入射光的單色性差；狹縫寬度太小，入射光的強減弱。狹縫寬度過大或過小均會造成靈敏度降低，選擇是產(chǎn)生MIN誤差情下的MAX狹縫。一般選用儀器的狹縫寬琶度應(yīng)小于待測樣品吸收帶的半寬度，否則測得的吸光度值會偏低，狹縫寬度的選擇應(yīng)以減少狹縫寬度時供試品的吸光度不再；加為準(zhǔn)，對于大部分被測品種，可以使用2nm縫寬。 </p> <p> 可通過控制被測物濃度或改變吸收池厚度來實現(xiàn)吸光度合理的范圍，以盡量減小測量誤差。一般吸光度盡量控制在0.1-0.8范圍。 </p> <p> 空白溶液是用來調(diào)節(jié)吸光度測量工作零點即A=0，T=100%的溶液，以消除溶液中其它基體組分以及吸收池和溶劑對入射光的反射和吸收所帶來的誤差。根據(jù)情況不同，常用空白溶液有如下幾種選擇。 </p> <p> <br /> 元素紫外可見分光光度計報價</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7幢4層、9幢，交通便利，環(huán)境優(yōu)美，是一家生產(chǎn)型企業(yè)。是一家有限責(zé)任公司企業(yè)，隨著市場的發(fā)展和生產(chǎn)的需求，與多家企業(yè)合作研究，在原有產(chǎn)品的基礎(chǔ)上經(jīng)過不斷改進，追求新型，在強化內(nèi)部管理，完善結(jié)構(gòu)調(diào)整的同時，良好的質(zhì)量、合理的價格、完善的服務(wù)，在業(yè)界受到寬泛好評。公司始終堅持客戶需求優(yōu)先的原則，致力于提供高質(zhì)量的分光光度計，氣相色譜，原子吸收，食品安全。儀電分析以創(chuàng)造***產(chǎn)品及服務(wù)的理念，打造高指標(biāo)的服務(wù)，引導(dǎo)行業(yè)的發(fā)展。</p></p><br /><p>文章來源地址: 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