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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>常用紫外可見分光光度計(jì)儀器,紫外可見分光光度計(jì)</p><p><span>***更新：</span>2020-11-03 00:31:14</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="lub7rjq" 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="cbnkm8k" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="e7hlceg" class="box"><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)，除盡量滿足單波長(zhǎng)測(cè)定的波長(zhǎng)要求外，常用紫外可見分光光度計(jì)儀器，常用紫外可見分光光度計(jì)儀器，還要求多個(gè)組分間的吸收光譜間線性無(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)曲線的線性范圍。狹縫過(guò)大，通常會(huì)使線性范圍變小，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，線性范圍容易滿足，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)都滿足線性范圍要求，應(yīng)選擇比較小的狹縫，常用紫外可見分光光度計(jì)儀器。光學(xué)構(gòu)造和光源、探測(cè)方法、樣品類型和數(shù)據(jù)處理等都是要考慮的因素。常用紫外可見分光光度計(jì)儀器</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="常用紫外可見分光光度計(jì)儀器,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png"></div><p> 紫外可見分光光度計(jì)條件設(shè)定 </p> <p> 在定量分析中，為了提高測(cè)定的靈敏度，入射光的波長(zhǎng)應(yīng)選擇被測(cè)物的MAX吸收波長(zhǎng)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(zhǎng)，不僅能提高測(cè)定的靈敏度，還能提高測(cè)定的準(zhǔn)確度。 </p> <p> 狹縫寬度過(guò)大，入射光的單色性差；狹縫寬度太小，入射光的強(qiáng)減弱。狹縫寬度過(guò)大或過(guò)小均會(huì)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(cè)樣品吸收帶的半寬度，否則測(cè)得的吸光度值會(huì)偏低，狹縫寬度的選擇應(yīng)以減少狹縫寬度時(shí)供試品的吸光度不再；加為準(zhǔn)，對(duì)于大部分被測(cè)品種，可以使用2nm縫寬。 </p> <p> 可通過(guò)控制被測(cè)物濃度或改變吸收池厚度來(lái)實(shí)現(xiàn)吸光度合理的范圍，以盡量減小測(cè)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(lái)調(diào)節(jié)吸光度測(cè)量工作零點(diǎn)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(duì)入射光的反射和吸收所帶來(lái)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 /> 直讀紫外可見分光光度計(jì)多少錢紫外分光光度計(jì)一般覆蓋190nm和380nm波長(zhǎng)，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="常用紫外可見分光光度計(jì)儀器,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><p> 可見分光光度計(jì)是一種常規(guī)的實(shí)驗(yàn)室分析儀器?？沙Ｓ糜跓o(wú)機(jī)物、有機(jī)物的定性、定量分析中，在科研、制藥、化工、環(huán)保、衛(wèi)生、防疫等領(lǐng)域中發(fā)揮重要的作用。有人說(shuō)，紫外、可見分光光度計(jì)就是一把尺子一個(gè)天平，凡是有化驗(yàn)、分析的地方都能用到它。那么，如何評(píng)價(jià)一臺(tái)紫外、可見分光光度計(jì)的優(yōu)劣呢? </p> <p> 要考察它的外觀。試想，一臺(tái)外型呆板、做工粗糙的儀器，怎么可能是一臺(tái)先進(jìn)的儀器呢? </p> <p> 我們探討一下會(huì)對(duì)儀器的使用有很大影響的幾個(gè)重要指標(biāo) </p> <p> <p> 1、光度準(zhǔn)確度 </p> <p> 2、雜散光 </p> <p> 3、光譜帶寬 </p> <p> 4、穩(wěn)定性 </p> <p> 5、噪聲 </p> <p> 6、波長(zhǎng)的準(zhǔn)確度和重復(fù)性 </p> <p> <br /> </p> </p><p> 分光光度計(jì)作為一種精密儀器，在運(yùn)行工作過(guò)程中由于工作環(huán)境、操作方法等種種原因，其技術(shù)狀況必然會(huì)發(fā)生某些變化，可能影響設(shè)備的性能，甚至誘發(fā)設(shè)備故障及事故。因此，分析工作者必須了解分光光度計(jì)的基本原理和使用說(shuō)明，并能及時(shí)發(fā)現(xiàn)和排除這些隱患，對(duì)已產(chǎn)生的故障及時(shí)維修才能保證儀器設(shè)備的正常運(yùn)行。 </p> <p> 紫外可見分光光度計(jì)--使用經(jīng)驗(yàn) </p> <p> 若大幅度改變測(cè)試波長(zhǎng)，需稍等片刻，等燈熱平衡后，重新校正“0”和“100%”然后再測(cè)量。 </p> <p> 指針式儀器在未接通電源時(shí)，電表的指針必須位于零刻度上。若不是這種情況，需進(jìn)行機(jī)械調(diào)零。 </p> <p> 比色皿使用完畢后，請(qǐng)立即用蒸餾水沖洗干凈，并用干凈柔軟的紗布將水跡擦去，以防止表面光潔度被破壞，影響比色皿的透光率。 </p> <p> 操作人員不應(yīng)輕易動(dòng)燈泡及反光鏡燈，以免影響光效率。 </p> <p> 1900型等分光光度計(jì)，由于其光電接收裝置為光電倍增管，它本身的特點(diǎn)是放大倍數(shù)大，因而可以用于檢測(cè)微弱光電信號(hào)，而不能用來(lái)檢測(cè)強(qiáng)光。否則容易產(chǎn)生信號(hào)漂移，靈敏度下降。 </p> <p> 針對(duì)其上述特點(diǎn)，在維修、使用此類儀器時(shí)應(yīng)注意不讓光電倍增管長(zhǎng)時(shí)間暴露于光下，因此在預(yù)熱時(shí)，應(yīng)打開比色皿蓋或使用擋光桿，避免長(zhǎng)時(shí)間照射使其性能漂移而導(dǎo)致工作不穩(wěn)。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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="常用紫外可見分光光度計(jì)儀器,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592124342670/5540999.png"></div><p style="text-indent:25px"><p>紫外可見分光光度計(jì)定量、定性分析需注意的問題<p>重復(fù)測(cè)定次數(shù)和波長(zhǎng)掃描速度：對(duì)吸光度不是很大的樣品，或者狹縫不是很小，這是檢測(cè)器檢測(cè)的光信號(hào)的強(qiáng)度是比較大的，重復(fù)性較好，可選擇較少的重復(fù)次數(shù)。相反，如果樣品吸光度很大，狹縫很小，選擇較大的重復(fù)次數(shù)可獲得更好的結(jié)果。5測(cè)定波長(zhǎng)間隔：在掃描光譜時(shí)需要選擇，可根據(jù)樣品吸收峰的寬度進(jìn)行選擇，峰寬較大時(shí)，可選擇較大的波長(zhǎng)間隔。反之亦反。通常每個(gè)正常的吸收峰應(yīng)該用不少于30個(gè)數(shù)據(jù)點(diǎn)表示出來(lái)。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。直讀紫外可見分光光度計(jì)多少錢</p><p style="text-indent:25px">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。常用紫外可見分光光度計(jì)儀器</p><p> 什么是紫外可見分光光度計(jì)？紫外可見分光光度計(jì)是一類很重要的分析儀器，無(wú)論在物理學(xué)、化學(xué)、生物學(xué)、醫(yī)學(xué)、材料學(xué)、環(huán)境科學(xué)等科學(xué)研究領(lǐng)域，還是在化工、醫(yī)藥、環(huán)境檢測(cè)、冶金等現(xiàn)代化生產(chǎn)與管理部門，紫外可見分光光度計(jì)都有重要的應(yīng)用。 </p> <p> 分光光度計(jì)是杜包斯克(Duboscq)和奈斯勒(Nessler)等人在1854年將朗伯-比爾(Lambert-Beer)定律應(yīng)用于定量分析化學(xué)領(lǐng)域，并且設(shè)計(jì)了第1臺(tái)比色計(jì)。到1918年，美國(guó)國(guó)家標(biāo)準(zhǔn)局制成了第1臺(tái)紫外可見分光光度計(jì)。此后，紫外可見分光光度計(jì)經(jīng)不斷改進(jìn)，又出現(xiàn)自動(dòng)記錄、自動(dòng)打印、數(shù)字顯示、微機(jī)控制等各種類型的儀器，使光度法的靈敏度和準(zhǔn)確度也不斷提高，其應(yīng)用范圍也不斷擴(kuò)大。紫外可見分光光度法從問世以來(lái)，在應(yīng)用方面有了很大的發(fā)展，尤其是在相關(guān)學(xué)科發(fā)展的基礎(chǔ)上，促使分光光度計(jì)儀器的不斷創(chuàng)新，功能更加齊全，使得光度法的應(yīng)用更拓寬了范圍。目前，分光光度法已為工農(nóng)業(yè)各個(gè)部門和科學(xué)研究的各個(gè)領(lǐng)域所采用，成為人們從事生產(chǎn)和科研的有力測(cè)試手段。目前市場(chǎng)上有兩類主流產(chǎn)品:掃描光柵式分光光度計(jì)和固定光柵式分光光度計(jì)。 </p> <p> <br /> 常用紫外可見分光光度計(jì)儀器</p><p style="text-indent:25px">上海儀電分析儀器有限公司屬于儀器儀表的高新企業(yè)，技術(shù)力量雄厚。儀電分析是一家有限責(zé)任公司企業(yè)，一直“以人為本，服務(wù)于社會(huì)”的經(jīng)營(yíng)理念;“誠(chéng)守信譽(yù)，持續(xù)發(fā)展”的質(zhì)量方針。公司業(yè)務(wù)涵蓋分光光度計(jì)，氣相色譜，原子吸收，食品安全，價(jià)格合理，品質(zhì)有保證，深受廣大客戶的歡迎。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(lái)源地址: 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