分析紫外可見分光光度計(jì)單價(jià) 客戶至上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)于吸光度測定重復(fù)性的問題分光光度計(jì)在測定過程中，分析紫外可見分光光度計(jì)單價(jià)，發(fā)現(xiàn)同一個(gè)溶液在不同時(shí)問里其測定結(jié)果不同，即重復(fù)性不好，其原因是什么?排除測定錯(cuò)誤因素外，分析紫外可見分光光度計(jì)單價(jià)，可能原因有：(1)儀器預(yù)熱時(shí)間不夠或預(yù)熱方法"><meta name="keywords" content="分析紫外可見分光光度計(jì)單價(jià),紫外可見分光光度計(jì)"><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" 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href="http://www.cdcfah.com/cp/third-gxyq_gpygdj/">光譜儀、光度計(jì)</a>?分析紫外可見分光光度計(jì)單價(jià) 客戶至上上海儀電分析儀器供應(yīng)</p><div id="bfxumq7" class="leftbox clearfix"><h1>分析紫外可見分光光度計(jì)單價(jià) 客戶至上上海儀電分析儀器供應(yīng)</h1><div id="y2snu98" class="proBig"><div id="x7hj3uw" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="3lsel98" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="3h82gta" 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>分析紫外可見分光光度計(jì)單價(jià),紫外可見分光光度計(jì)</p><p><span>***更新：</span>2020-11-13 02:18:12</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="2zyumgx" 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="3aszbqw" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="gfhzbah" class="box"><p><p> 關(guān)于吸光度測定重復(fù)性的問題分光光度計(jì)在測定過程中，分析紫外可見分光光度計(jì)單價(jià)，發(fā)現(xiàn)同一個(gè)溶液在不同時(shí)問里其測定結(jié)果不同，即重復(fù)性不好，其原因是什么?排除測定錯(cuò)誤因素外，分析紫外可見分光光度計(jì)單價(jià)，可能原因有：(1)儀器預(yù)熱時(shí)間不夠或預(yù)熱方法不對所造成，分析紫外可見分光光度計(jì)單價(jià)，應(yīng)延長預(yù)熱時(shí)間或采用正確的預(yù)熱方法。 </p> <p> (2)光電轉(zhuǎn)換器(如光電管)因長時(shí)間使用其光電轉(zhuǎn)換效率發(fā)生了變化導(dǎo)致。這時(shí)標(biāo)準(zhǔn)溶液與待測溶液的吸光度都同樣變低，在相對定量時(shí)對結(jié)果影響很小。但是對這類儀器，一般建議連續(xù)使用時(shí)間不應(yīng)超過3h，若需長時(shí)間使用，間歇30min。實(shí)驗(yàn)室研究人員希望省錢購入專門儀器定量核酸、蛋白或者細(xì)菌的生長情況。分析紫外可見分光光度計(jì)單價(jià)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="分析紫外可見分光光度計(jì)單價(jià),紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png"></div><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(jì)時(shí)，是否要經(jīng)常進(jìn)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(shí)才應(yīng)進(jìn)行波長準(zhǔn)確度的檢查，簡易的檢查方法(粗檢)是：儀器開機(jī)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(jìn)行波長校正。當(dāng)儀器經(jīng)過長途搬運(yùn)、受過機(jī)械振動或更換光源燈泡后，必須進(jìn)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、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。上海紫外可見分光光度計(jì)選擇紫外光分光光度計(jì)分為單光束和雙光束兩類。單光束型主要是依賴單束光進(jìn)行測量。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="分析紫外可見分光光度計(jì)單價(jià),紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592124342670/5540999.png"></div>紫外可見分光光度計(jì)的基本結(jié)構(gòu) <p> 紫外可見分光光度計(jì)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(qiáng)度變化轉(zhuǎn)變?yōu)殡娦盘栕兓⒔?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(jì)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(shí)，發(fā)出的光強(qiáng)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(qiáng)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(dá)10000小時(shí)以上。 </p> <p> 目前很多光度計(jì)采用鹵鎢燈代替鎢燈，如7230G型、752PLUS型分光光度計(jì)等。鹵鎢燈具有較高的發(fā)光效率和較長的使用壽命。 </p><p> 雙光束UV：經(jīng)棱鏡分光后通過光柵，加強(qiáng)了靈敏度，同時(shí)測量空白樣品與目標(biāo)樣品的優(yōu)點(diǎn)，全波段分析時(shí)間長。全波段UV：樣品與空白樣品可以暴露在空氣中，照射樣品后，進(jìn)入密閉箱，通過光柵，進(jìn)入DAD檢測器檢測。檢測樣品不需要密閉，外界光線對測試無影響，使用方便準(zhǔn)確且空白只需要檢測一次，全波段分析時(shí)間小于1s。 </p> <p> 紫外可見光分光光度計(jì)的體積大小以及外觀美學(xué)性。紫外可見分光光度計(jì)的儀器體積大小，會牽扯儀器所需要的擺放位置以及儀器使用的方便程度。 </p> <p> 儀器的外形美觀，給人以大氣、上檔次、舒適、新鮮的感覺。首先，會讓使用儀器者對儀器分外的愛護(hù)、維護(hù)和保養(yǎng)，有利于延長儀器的使用壽命。同時(shí)，也會讓儀器使用者的工作環(huán)境更舒適、優(yōu)美，也有利于提高工作效率。 </p> <p> 紫外可見光分光光度計(jì)儀器使用范圍。紫外可見光分光光度的使用范圍是有儀器的性能指標(biāo)所決定。采購紫外可見光分光光度計(jì)根據(jù)測試樣品的具體要求，參考儀器的使用范圍，滿足即可，不必苛求。當(dāng)然，土豪可以忽略。紫外分光光度計(jì)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="分析紫外可見分光光度計(jì)單價(jià),紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png"></div><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、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臺比色計(jì)。到1918年，美國國家標(biāo)準(zhǔn)局制成了第1臺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)自動記錄、自動打印、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，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)和科研的有力測試手段。目前市場上有兩類主流產(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 /> 大部分單機(jī)型的分光光度計(jì)包含了驅(qū)動儀器運(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。石油紫外可見分光光度計(jì)對比</p><p style="text-indent:25px">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考慮。分析紫外可見分光光度計(jì)單價(jià)</p><p> 可見分光光度計(jì)，紫外分光光度計(jì)和紫外可見分光光度計(jì)有什么區(qū)別? </p> <p> 可見分光光度計(jì)和紫外分光光度計(jì)的區(qū)別是測定波長范圍不同，一般可見光波長范圍是400～1000nm,紫外光波長范圍是200～400nm。所謂紫外可見分光光度計(jì)也就是說這個(gè)儀器可以通過更換光源形成紫外和可見的光區(qū)，能夠測定吸收峰在紫外和可見光部分的化合物。一般測定波長在200～1000nm。 </p> <p> 分光光度計(jì)的關(guān)鍵參數(shù)有哪些? </p> <p> 選擇可見和紫外可見的分光光度計(jì)所關(guān)注的關(guān)鍵的指標(biāo)有三點(diǎn)：一是波長范圍，二是波長準(zhǔn)確度，三是雜散光參數(shù)。波長范圍的選擇是由用戶實(shí)驗(yàn)需要所定，波長范圍越寬的價(jià)格越貴;波長準(zhǔn)確度及雜散光參數(shù)的數(shù)值越低，表示性能越好。分析紫外可見分光光度計(jì)單價(jià)</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，是一家生產(chǎn)型公司。儀電分析致力于為客戶提供良好的分光光度計(jì)，氣相色譜，原子吸收，食品安全，一切以用戶需求為中心，深受廣大客戶的歡迎。公司將不斷增強(qiáng)企業(yè)重點(diǎn)競爭力，努力學(xué)習(xí)行業(yè)知識，遵守行業(yè)規(guī)范，植根于儀器儀表行業(yè)的發(fā)展。儀電分析秉承“客戶為尊、服務(wù)為榮、創(chuàng)意為先、技術(shù)為實(shí)”的經(jīng)營理念，全力打造公司的重點(diǎn)競爭力。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1965124.html</p></div></div></div></div></div><div id="8qnpr3j" class="page-right twoColRt"><div id="k3um8xo" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="3myfm9v" class="recomPic 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