手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨歡迎來(lái)電上海儀電分析儀器供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺(tái)【買(mǎi)產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="眾所周知，紫外可見(jiàn)分光光度計(jì)的光源部需要經(jīng)常更換光源燈（鎢燈或氘燈），一般來(lái)說(shuō)這種工作均由儀器廠家的工程師來(lái)進(jìn)行；如果儀器用戶自己可以掌握這種更換和調(diào)整技術(shù)，既能節(jié)約等待時(shí)間又能節(jié)省維修費(fèi)用，可謂一舉兩得。雖然有些用戶也曾經(jīng)自行嘗試過(guò)這種工"><meta name="keywords" content="手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨,紫外可見(jiàn)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 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class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁(yè)?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_yiqiyibiao/">儀器儀表</a>?<a href="http://www.cdcfah.com/cp/second-yiqiyibiao_gxyq/">光學(xué)儀器</a>?<a href="http://www.cdcfah.com/cp/third-gxyq_gpygdj/">光譜儀、光度計(jì)</a>?手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨歡迎來(lái)電上海儀電分析儀器供應(yīng)</p><div id="v3pbszg" class="leftbox clearfix"><h1>手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨歡迎來(lái)電上海儀電分析儀器供應(yīng)</h1><div id="wwikmyp" class="proBig"><div id="pn3xzqc" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="hqdum8y" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="vs8nfmy" 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>手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨,紫外可見(jiàn)分光光度計(jì)</p><p><span>***更新：</span>2020-11-16 03:17:00</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="7o232is" 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="cvmtpr8" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="mfqxpwn" class="box"><p><p> 眾所周知，紫外可見(jiàn)分光光度計(jì)的光源部需要經(jīng)常更換光源燈（鎢燈或氘燈），一般來(lái)說(shuō)這種工作均由儀器廠家的工程師來(lái)進(jìn)行；如果儀器用戶自己可以掌握這種更換和調(diào)整技術(shù)，既能節(jié)約等待時(shí)間又能節(jié)省維修費(fèi)用，可謂一舉兩得。 </p> <p> 雖然有些用戶也曾經(jīng)自行嘗試過(guò)這種工作，但往往效果不太理想，究其原因則是沒(méi)有掌握要領(lǐng)，他們將這種更換光源燈的工作看做與更換室內(nèi)照明燈泡的性質(zhì)一樣，認(rèn)為只要換上的光源燈被亮即萬(wàn)事大吉；為此，我談?wù)勥@方面的調(diào)整要領(lǐng)。 </p> <p> 一般簡(jiǎn)易型分光光度計(jì)的光源室**設(shè)計(jì)了一支鎢燈來(lái)涵蓋整個(gè)波長(zhǎng)區(qū)域的使用，由于鎢燈的能量在紫外區(qū)很弱，因此、此類(lèi)儀器在紫外區(qū)的測(cè)量信號(hào)的噪聲較大。 </p> <p> 當(dāng)然、也有**的紫外分光光度計(jì)，同理，手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨，手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨、光源燈就改用一支氘燈了，手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨。 </p> <p> <br /> </p> <p> 為了保障在190～1100nm區(qū)域內(nèi)的高信噪比，目前的儀器均采用兩只光源燈互補(bǔ)使用，即在紫外區(qū)采用氘燈，而在可見(jiàn)區(qū)使用鎢燈，兩只燈的選擇采用旋轉(zhuǎn)光源鏡來(lái)切換。分光光度計(jì)的氘燈和汞燈是在不同波長(zhǎng)的時(shí)候有程序控制自動(dòng)變換的，一般是在360nm處變換。手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png"></div><p> 紫外可見(jiàn)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*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 /> 暗箱紫外可見(jiàn)分光光度計(jì)選擇因?yàn)樵黾恿藴y(cè)量的速度，所以雙光束分光光度計(jì)在測(cè)量一些溶液隨時(shí)間動(dòng)態(tài)變化的研究中大有用處。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png"></div><p> 雜散光：典型值是0.01～0.05%T，在國(guó)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(guò)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(jì)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(jì)少了出射狹縫，實(shí)現(xiàn)低雜散光的難度更大。從性能指標(biāo)來(lái)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(dá)到半數(shù)，但是能夠低于0.01%T的很少。波長(zhǎng)準(zhǔn)確性，國(guó)外的典型水平是0.1～1nm。國(guó)內(nèi)產(chǎn)品中，處于此范圍的有16種，基本達(dá)到同一水平，但沒(méi)有優(yōu)于0.1nm的產(chǎn)品。國(guó)內(nèi)產(chǎn)品的光度準(zhǔn)確性大多以透過(guò)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(guó)外產(chǎn)品有比較明顯的差距。國(guó)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(guó)外與國(guó)內(nèi)產(chǎn)品的雜散光的典型值，兩者幾乎相差了一個(gè)數(shù)量級(jí)。但是已有一些較新研發(fā)的產(chǎn)品，可以達(dá)到國(guó)外產(chǎn)品的普遍水準(zhǔn)。 </p><p> 雙光束UV：經(jīng)棱鏡分光后通過(guò)光柵，加強(qiáng)了靈敏度，同時(shí)測(cè)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(zhǎng)。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(guò)光柵，進(jìn)入DAD檢測(cè)器檢測(cè)。檢測(cè)樣品不需要密閉，外界光線對(duì)測(cè)試無(wú)影響，使用方便準(zhǔn)確且空白只需要檢測(cè)一次，全波段分析時(shí)間小于1s。 </p> <p> 紫外可見(jiàn)光分光光度計(jì)的體積大小以及外觀美學(xué)性。紫外可見(jiàn)分光光度計(jì)的儀器體積大小，會(huì)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(jué)。首先，會(huì)讓使用儀器者對(duì)儀器分外的愛(ài)護(hù)、維護(hù)和保養(yǎng)，有利于延長(zhǎng)儀器的使用壽命。同時(shí)，也會(huì)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(jiàn)光分光光度計(jì)儀器使用范圍。紫外可見(jiàn)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(gòu)紫外可見(jiàn)光分光光度計(jì)根據(jù)測(cè)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。例如測(cè)試紫外區(qū)時(shí)則可關(guān)閉紫外分光光度計(jì)鎢燈；反之關(guān)閉氘燈。這樣就延長(zhǎng)了那只不使用的光源燈的壽命。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png"></div><p> 原子吸收分光光度計(jì)與紫外可見(jiàn)分光光度計(jì)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(jiàn)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(cè)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(jiàn)吸收為紫外光及可見(jiàn)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(shuō)，原子吸收分光光度計(jì)是用較高的溫度來(lái)燃燒分子，使之原子化（變?yōu)榛鶓B(tài)原子），再通過(guò)特征輻射，把基態(tài)原子激發(fā)，并吸收能量，通過(guò)這個(gè)能量差（透過(guò)率）來(lái)計(jì)算出濃度。而紫外—可見(jiàn)分光光度計(jì)是通過(guò)顯色劑（一種能和我們被測(cè)元素產(chǎn)生絡(luò)合反應(yīng)的分子），與我們的被測(cè)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(guò)分子吸收氘燈（紫外區(qū)）或鎢燈（可見(jiàn)區(qū)）的照射，吸收燈發(fā)射的能量，通過(guò)能量差（透過(guò)率）來(lái)計(jì)算出濃度。紫外可見(jiàn)分光光度計(jì)主要由光源系統(tǒng)、單色器系統(tǒng)、樣品室、檢測(cè)系統(tǒng)組成。分析紫外可見(jiàn)分光光度計(jì)廠家供應(yīng)</p><p style="text-indent:25px">紫外可見(jiàn)分光光度計(jì)基本工作原理和紅外光譜儀相似，利用一定頻率的紫外可見(jiàn)光照射被分析的有機(jī)物質(zhì)。手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨</p><p style="text-indent:25px">使用紫外可見(jiàn)分光光度計(jì)進(jìn)行定量和定性分析需注意以下一些問(wèn)題：1吸光度讀數(shù)范圍：吸光度測(cè)量誤差在透過(guò)率過(guò)大或過(guò)小時(shí)都會(huì)變大，為了滿足定量分析的誤差要求（<5%），在定量分析時(shí)要求吸光度應(yīng)在一定的范圍內(nèi)，這個(gè)范圍的具體值與儀器性能有關(guān)，主要是與紫外可見(jiàn)分光光度計(jì)檢測(cè)系統(tǒng)噪聲大小有關(guān)，但通常都在0.1~1.0范圍內(nèi)，如果儀器的檔次更低，則范圍更窄。根據(jù)朗伯比爾定律，影響吸光度大小的因素主要是樣品摩爾吸光系數(shù)，濃度和比色皿光程。實(shí)驗(yàn)中吸光度過(guò)大的樣品可通過(guò)稀釋樣品使吸光度到所需范圍內(nèi)。如果樣品不能稀釋，可以改用光程較小的比色皿減小吸光度。吸光度過(guò)小的樣品可使用光程較大的比色皿以增大吸光度。手持紫外可見(jiàn)分光光度計(jì)現(xiàn)貨</p><p style="text-indent:25px">上海儀電分析儀器有限公司一直專注于儀器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷(xiāo)售，計(jì)算機(jī)軟件開(kāi)發(fā)及銷(xiāo)售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)?！疽婪毥?jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】?jī)x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(xiāo)售，計(jì)算機(jī)軟件開(kāi)發(fā)及銷(xiāo)售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)。【依法須經(jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】，是一家儀器儀表的企業(yè)，擁有自己獨(dú)立的技術(shù)體系。目前我公司在職員工以90后為主，是一個(gè)有活力有能力有創(chuàng)新精神的團(tuán)隊(duì)。公司業(yè)務(wù)范圍主要包括：分光光度計(jì)，氣相色譜，原子吸收，食品安全等。公司奉行顧客至上、質(zhì)量為本的經(jīng)營(yíng)宗旨，深受客戶好評(píng)。公司力求給客戶提供全數(shù)良好服務(wù)，我們相信誠(chéng)實(shí)正直、開(kāi)拓進(jìn)取地為公司發(fā)展做正確的事情，將為公司和個(gè)人帶來(lái)共同的利益和進(jìn)步。經(jīng)過(guò)幾年的發(fā)展，已成為分光光度計(jì)，氣相色譜，原子吸收，食品安全行業(yè)出名企業(yè)。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2007758.html</p></div></div></div></div></div><div id="dczqiug" class="page-right 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