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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="qkheq8k" 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="7npwy8o" 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>石油紫外可見分光光度計,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-19 07:15:08</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="ic8zvhg" 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="83kiofm" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="kjqseac" class="box"><p><p> 當(dāng)你什么都不了解的情況下，只選貴的，準(zhǔn)沒錯。在某種程度上，這句話具有一定的適用性。但是，新型儀器一般價格較貴，如果過度放寬儀器預(yù)算，而追加經(jīng)費采購不需要的配件也是一種浪費。如何快速簡單的掌握紫外可見分光光度計的特性，從而進(jìn)行合適的采購定位，小編將所需要的知識點總結(jié)如下。 </p> <p> 認(rèn)識紫外可見光分光光度計使用范圍。任何一臺儀器都不是解決所有問題的同一把鑰匙。多問自己幾個問題：需要一臺什么樣的儀器，要用它來做什么，分析的樣品的形態(tài)、所需要的測試范圍以及精度要求在哪里等等。理清楚這些，儀器的基本輪廓就畫出來了。 </p> <p> 紫外可見光分光光度計作為一種常規(guī)的實驗室分析儀器，可以常用于無機(jī)物，石油紫外可見分光光度計、有機(jī)物的定性定量分析，所使用的科研領(lǐng)域包括：科研，石油紫外可見分光光度計、制藥、化工、環(huán)保，石油紫外可見分光光度計、衛(wèi)生等需要分析的關(guān)鍵領(lǐng)域。現(xiàn)在的許多紫外分光光度計裝的是“長壽”型燈源，據(jù)說氘燈可達(dá)2000小時，鎢燈3000小時。石油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="石油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/ydfx123/637396592155319523/9592810.png"></div><p> 紫外可見分光光度計之比色皿的選擇與使用小技巧 </p> <p> 一直以來都認(rèn)為比色皿洗滌不干凈會造成很大實驗誤差，才發(fā)現(xiàn)原來比色皿選擇不當(dāng)也能造成不可預(yù)測的誤差。在此，就小結(jié)下有關(guān)如何正確選擇比色皿、比色皿使用注意事項以及比色皿的洗滌方法。 </p> <p> 比色皿透光面是由能夠透過所使用的波長范圍的光的材料制成。在200-350nm工作的比色皿適用于紫外區(qū),必須使用石英或熔熔硅石制成透光面的石英比色皿。(注：熔熔硅石的還真沒見過，只用過石英的)石英比色皿既可用于紫外區(qū)又可用于可見區(qū)，但是價格一般比較貴，所以要根據(jù)使用波長選擇比色皿，如果不用紫外區(qū)的話，用普通玻璃比色皿就行了，一則浪費沒必要，二則，嘿嘿，摔碎了也不心疼，哈哈。而普通硅酸鹽光學(xué)玻璃制成的透光面的比色皿,只能用于350nm至1000nm的可見區(qū)。國內(nèi)**紫外可見分光光度計廠家在分光光度計的使用或檢定中,透射比(吸光度)的準(zhǔn)確度直接關(guān)系到所測數(shù)據(jù)的可信性及科學(xué)性。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="石油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/ydfx123/637396593808795839/2949755.png"></div><p> 紫外可見分光光度計是一類很重要的實驗室分析儀器，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都有面向廣的應(yīng)用。 </p> <p> 紫外可見分光光度計校正 </p> <p> 開機(jī)預(yù)熱10分鐘足矣； </p> <p> 放入黑塊和標(biāo)樣（沒有的自己配），關(guān)閉蓋子； </p> <p> 校0； </p> <p> 把燈光對著黑塊，把透光度調(diào)0； </p> <p> 把燈光對標(biāo)樣，將吸光度調(diào)到100%。 </p> <p> 紫外可見分光光度計使用注意事項 </p> <p> 開機(jī)前應(yīng)先預(yù)熱15分鐘，然后開機(jī)自檢； </p> <p> 濕度要控制在75%左右，溫度在5～30度之間； </p> <p> 儀器要穩(wěn)壓電源，接地要好。并且避免陽光直接照射。 </p><p> 進(jìn)行單波長測量時，需要考慮朗伯比爾定律對入射光單色性的要求和測定靈敏度的要求。沒有干擾時，一般選擇在吸收峰的MAX吸收波長位置處，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)行多波長校正時，除盡量滿足單波長測定的波長要求外，還要求多個組分間的吸收光譜間線性無關(guān)。 </p> <p> 紫外分光光度計狹縫的大小會影響到儀器的信噪比和標(biāo)準(zhǔn)曲線的線性范圍。狹縫過大，通常會使線性范圍變小，特別是當(dāng)不在MAX吸收波長位置測定時更是如此。狹縫過小，信噪比變差，基線平直度和測量數(shù)據(jù)的重復(fù)性會變差。此外，還需要考慮樣品吸收峰寬度的影響。通常單波長測定時，一般選擇在MAX吸收波長位置，線性范圍容易滿足，可選擇較寬的狹縫（1~2nm）多波長測定時，很難同時在所有波長都滿足線性范圍要求，應(yīng)選擇比較小的狹縫。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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="石油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/ydfx123/637396593893024301/8360761.png"></div><p> 使用紫外分光光度計的過程中，經(jīng)常會遇到儀器因光源達(dá)不到要求，需要進(jìn)行調(diào)修。要求光源燈處不能有空氣流動，因為單光束儀器很忌諱空氣快速流動而使光源燈的色溫發(fā)生變化。如遇電壓正常而鎢燈不亮?xí)r，就需要更換鎢燈。更換時，不要用手直接接觸燈泡表面，如果手指摸過，應(yīng)用無水乙醇和C4H10O混合液擦拭干凈，否則通電后指印遇熱不能去除。安裝光源燈后要注意調(diào)整光路。光源燈有兩個引線頭，安裝時用導(dǎo)線焊接，主要是防止接觸不良而造成的光源發(fā)光不穩(wěn)現(xiàn)象。在焊接時防止焊點與燈頭銅皮碰上，裝上燈座使電源短路。燈絲要求平直，如果燈絲彎曲，會影響光能量。燈絲的位置要與入射狹縫平行并對準(zhǔn)，上、下、左、右調(diào)節(jié)后緊固螺釘。擰緊燈座的螺紋套，可用鉗子擰緊，一般燈頭盡量往燈座里塞，因為多數(shù)燈絲離燈頭偏高。調(diào)整燈位置的前后可移動整個燈座架，它下面有三個固定螺釘，先稍松后，移動前后位置再固定。一般調(diào)節(jié)鎢燈的位置時，將波長調(diào)到580nm處，狹縫調(diào)到MAX，把一張白紙置于比色皿盒邊出口處，觀察白紙上的光斑。若光斑上方左右角均不完整成半圓弧，可能是光源燈高度不對；光斑左邊或右邊不完整，可調(diào)光源燈底座位置。調(diào)整至白紙上可見明亮、均勻的長方形黃橙色光斑。分光光度計的氘燈和汞燈是在不同波長的時候有程序控制自動變換的，一般是在360nm處變換。上海**紫外可見分光光度計單價</p><p style="text-indent:25px">因為增加了測量的速度，所以雙光束分光光度計在測量一些溶液隨時間動態(tài)變化的研究中大有用處。石油紫外可見分光光度計</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(qiáng)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(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。石油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主營品牌有儀電分析,上分，發(fā)展規(guī)模團(tuán)隊不斷壯大，該公司生產(chǎn)型的公司。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(jìn)，追求新型，在強(qiáng)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。儀電分析順應(yīng)時代發(fā)展和市場需求，通過**技術(shù)，力圖保證高規(guī)格高質(zhì)量的分光光度計，氣相色譜，原子吸收，食品安全。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2054581.html</p></div></div></div></div></div><div id="y2dtqce" class="page-right twoColRt"><div id="3wsulcz" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="yfw7jfh" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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