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href="http://www.cdcfah.com/cp/first-_yiqiyibiao/">儀器儀表</a>?<a href="http://www.cdcfah.com/cp/second-yiqiyibiao_fenxiyiqi/">分析儀器</a>?<a href="http://www.cdcfah.com/cp/third-fenxiyiqi_zwfxy/">紫外分析儀</a>?國內(nèi)紫外可見分光光度計廠家鑄造輝煌上海儀電分析儀器供應(yīng)</p><div id="cgaxp23" class="leftbox clearfix"><h1>國內(nèi)紫外可見分光光度計廠家鑄造輝煌上海儀電分析儀器供應(yīng)</h1><div id="8yqnpo7" class="proBig"><div id="gpbd2ol" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592124342670/5540999.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="dmovx2i" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592124342670/5540999.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="kzr2s9i" 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>國內(nèi)紫外可見分光光度計廠家,紫外可見分光光度計</p><p><span>***更新：</span>2020-12-24 02:13:48</p><p><span id="click" >瀏覽次數(shù)：6次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="cr24v9b" 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="dmogir4" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="d7nkcen" class="box"><p><p> 選擇比色皿洗滌液的原則是去污效果好，不損壞比色皿，同時又不影響測定，國內(nèi)紫外可見分光光度計廠家。 </p> <p> 分析常用的鉻酸洗液不宜用于洗滌比色皿，這是因為帶水的比色皿在該洗液中有時會局部發(fā)熱，致使比色皿膠接面裂開而損壞。同時經(jīng)洗液洗滌后的比色皿還很可能殘存微量鉻，其在紫外區(qū)有吸收，因此會影響鉻及其他有關(guān)元素的測定。 </p> <p> 一般主張使用硝酸和過氧化氫(5：1)的混合溶液泡洗，然后用水沖洗干凈。對一般方法難以洗凈的比色皿，還可以采取以下兩種方法。 </p> <p> 先將比色皿侵入含有少量陰離子表面活性劑的碳酸鈉(20克/升)溶液泡洗，國內(nèi)紫外可見分光光度計廠家，經(jīng)水沖洗后，再于過氧化氫和硝酸(5：1)混合溶液中侵泡半小時。 </p> <p> 紫外可見分光光度計的比色皿的洗滌方法 </p> <p> 分光光度法中比色皿潔凈與否是影響測定準(zhǔn)確度的因素之一。因此，必須重視選擇正確的洗凈方法。 </p> <p> 俺的經(jīng)驗是：要是你定溶液是酸，如果不干凈，就用弱堿溶液洗，要是你測定溶液是堿，國內(nèi)紫外可見分光光度計廠家，如果不干凈，就用弱酸溶液洗，要是你測定溶液是有機(jī)物質(zhì)，如果不干凈，就用有機(jī)溶劑，比如酒精等溶液洗。 </p> <p> <br /> 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。國內(nèi)紫外可見分光光度計廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國內(nèi)紫外可見分光光度計廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592124342670/5540999.png"></div><p> 紫外可見分光光度計的基本結(jié)構(gòu)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> 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。水質(zhì)紫外可見分光光度計現(xiàn)貨紫外可見光的范圍內(nèi)，對于一個特定的波長，吸收的程度正比于試樣中該成分的濃度，可以進(jìn)行定性分析。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國內(nèi)紫外可見分光光度計廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><p style="text-indent:25px">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。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。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。</p><p> 紫外分光光度計一般覆蓋190nm和380nm波長，通常利用氘燈照明。一些特殊的儀器可以提供滿足光子學(xué)和半導(dǎo)體研究需要的光譜范圍。VarianofPaloAlto公司的CaryDeepUV和HitachiHighTechnologiesofTokyo的U-7000AutomatedVacuumUVSystem就是這樣的儀器。 </p> <p> 一些儀器具有多種光源供選擇：紫外光、可見光和甚至紅外光（780nm至3,000nm）。鎢燈和鹵素?zé)粢话阒桓采w可見光部分（大約380nm到800nm）。而氙燈則可以覆蓋紫外光和可見光區(qū)域。光源和檢測方法（LIGHTSOURCESANDDETECTION）分光光度計的光譜也是需要考慮的一個重要因素。實驗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。例如AmershamBiosciencesofPiscataway公司的GeneQuantII能在230、260、280、320、595和600nm的波長下測量樣品。果果需要更大的靈活性，研究者可以考慮一種更高性能的寬光譜儀器，可以程序性地進(jìn)行ELISAs分析和比色分析。金屬離子常與有機(jī)物形成絡(luò)合物，多數(shù)絡(luò)合物在紫外可見區(qū)是有吸收的，我們可以利用分光光度法來研究其組成。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="國內(nèi)紫外可見分光光度計廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png"></div><p> 雙光束UV：單光源單光束，全程密閉，通過棱鏡分出兩道光，分別通過一光柵，分別進(jìn)入各自的光點倍增管檢測器。 </p> <p> 好處：加強(qiáng)靈敏度，同時測量空白與樣品。 </p> <p> 缺點：全波段分析時間較長。 </p> <p> 全波段UV：單光源單光束，樣品與空白暴露在空氣中，照射樣品，開始進(jìn)入密閉箱，通過光柵，進(jìn)入DAD檢測器。 </p> <p> 好處：空白只需要檢測一次，如果你愿意一輩子檢測這一次都可以。檢測樣品不密閉，外界光線對其無影響，使用方便且精確。分析任何波段或全波段不到1s。 </p> <p> 缺點：貴。紫外可見吸收光譜是由于分子中的某些基團(tuán)吸收了紫外可見輻射光后，發(fā)生了電子能級躍遷而產(chǎn)生的吸收光譜。上海紫外可見分光光度計性價比</p><p style="text-indent:25px">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。國內(nèi)紫外可見分光光度計廠家</p><p> 紫外可見分光光度計之比色皿的選擇與使用小技巧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)。 </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> <br /> 國內(nèi)紫外可見分光光度計廠家</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)型的公司。公司自成立以來，以質(zhì)量為發(fā)展，讓匠心彌散在每個細(xì)節(jié)，公司旗下分光光度計，氣相色譜，原子吸收，食品安全深受客戶的喜愛。公司秉持誠信為本的經(jīng)營理念，在儀器儀表深耕多年，以技術(shù)為先導(dǎo)，以自主產(chǎn)品為重點，發(fā)揮人才優(yōu)勢，打造儀器儀表良好品牌。儀電分析立足于全國市場，依托強(qiáng)大的研發(fā)實力，融合前沿的技術(shù)理念，飛快響應(yīng)客戶的變化需求。</p></p><br /><p>文章來源地址: 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