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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="tr7hm88" 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="gyj3e9j" 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>高性能紫外可見分光光度計(jì)排行,紫外可見分光光度計(jì)</p><p><span>***更新：</span>2020-11-05 07:20:57</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="dlmjnci" 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="xf3mwga" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="xfl233c" class="box"><p><p> 原子吸收分光光度計(jì)與紫外可見分光光度計(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，高性能紫外可見分光光度計(jì)排行. </p> <p> 紫外可見光吸收觀察的是構(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，高性能紫外可見分光光度計(jì)排行. </p> <p> 紫外可見吸收為紫外光及可見光，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），再通過特征輻射，把基態(tài)原子激發(fā)，并吸收能量，通過這個(gè)能量差（透過率）來(lái)計(jì)算出濃度。而紫外—可見分光光度計(jì)是通過顯色劑（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)過分子吸收氘燈（紫外區(qū)）或鎢燈（可見區(qū)）的照射，吸收燈發(fā)射的能量，通過能量差（透過率）來(lái)計(jì)算出濃度，高性能紫外可見分光光度計(jì)排行。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(jí)躍遷而產(chǎn)生的吸收光譜。高性能紫外可見分光光度計(jì)排行</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="高性能紫外可見分光光度計(jì)排行,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.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。狹縫寬度過大或過小均會(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 /> 國(guó)產(chǎn)**紫外可見分光光度計(jì)對(duì)比紫外可見光分光光度計(jì)是使用紫外光譜特點(diǎn)而設(shè)計(jì)制造的光學(xué)儀器。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="高性能紫外可見分光光度計(jì)排行,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593808795839/2949755.png"></div><p> 紫外分光光度計(jì)做不準(zhǔn)？比色皿出錯(cuò)了唄。一文了解比色皿的正確使用，配對(duì)，洗滌。 </p> <p> 比色皿（cuvette）是一種用于光譜分析的裝備儀器。常用的主要是由石英粉燒制的石英比色皿和普通硅酸鹽光學(xué)玻璃制成的透光面比色皿。 </p> <p> 當(dāng)然也有微量、半微量、熒光等比色皿出現(xiàn)。 </p> <p> 石英比色皿（Q/S）：適用波長(zhǎng)范圍在190nm-2500nm（適用于紫外、可見、近紅外光區(qū)）價(jià)格較玻璃比色皿較貴 </p> <p> 玻璃比色皿（G）：適用波長(zhǎng)范圍320nm-2500nm（不適用于紫外光區(qū)），價(jià)格相對(duì)便宜 </p> <p> 由上述數(shù)據(jù)可以看出石英比色皿完全可以代替玻璃比色皿使用，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(fèi)沒必要，二則，嘿嘿，摔碎了也不心疼。至于微量、半微量、熒光等比色皿不常用就不在說(shuō)了。 </p><p> 紫外可見分光光度計(jì)的軟件功能可以極大地提升儀器的使用性能和價(jià)值，現(xiàn)代分光光度計(jì)生產(chǎn)廠商都非常重視儀器配套軟件的開發(fā)。除了儀器控制軟件和通用數(shù)據(jù)分析處理軟件外，很多儀器針對(duì)不同行業(yè)應(yīng)用開發(fā)了**分析軟件，給儀器使用者帶來(lái)了極大的便利。 </p> <p> 紫外可見分光光度計(jì)的結(jié)構(gòu)一般地，紫外可見分光光度計(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，如圖1所示。光源發(fā)出的復(fù)合光通過單色器被分解成單色光，當(dāng)單色光通過樣品室時(shí)，一部分被樣品吸收，其余未被吸收的光到達(dá)檢測(cè)器，被轉(zhuǎn)變?yōu)殡娦盘?hào)，經(jīng)電子電路的放大和數(shù)據(jù)處理后，通過顯示系統(tǒng)給出測(cè)量結(jié)果。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-比爾定律應(yīng)用于定量分析化學(xué)領(lǐng)域。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="高性能紫外可見分光光度計(jì)排行,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png"></div><p> 分光光度計(jì)作為一種精密儀器，在運(yùn)行工作過程中由于工作環(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> 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%”點(diǎn)。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。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。實(shí)驗(yàn)室紫外可見分光光度計(jì)排名</p><p style="text-indent:25px">分光光度分析就是根據(jù)物質(zhì)的吸收光譜研究物質(zhì)的成分、結(jié)構(gòu)和物質(zhì)間相互作用的有效手段。高性能紫外可見分光光度計(jì)排行</p><p style="text-indent:25px">紫外分光光度計(jì)檢測(cè)器是將光信號(hào)轉(zhuǎn)變?yōu)殡娦盘?hào)的裝置。測(cè)量吸光度時(shí)，并非直接測(cè)量透過吸收池的光強(qiáng)度，而是將光強(qiáng)度轉(zhuǎn)換成電流進(jìn)行測(cè)量，這種光電轉(zhuǎn)換器件稱為檢測(cè)器，又叫接受器。常用的檢測(cè)器有光電池、光電管、光電倍增管及光電二極管陣列檢測(cè)器等。光電池價(jià)格便宜，但長(zhǎng)時(shí)間曝光，會(huì)使靈敏度降低。光電管的靈敏度比光電池高；光電倍增管不僅靈敏度比普通光電管高，而且響應(yīng)速度快，目前中、高性能分光光度計(jì)中一般采用它作為檢測(cè)器。光電二極管陣列檢測(cè)器是紫外可見分光光度計(jì)檢測(cè)的一個(gè)重要進(jìn)展。高性能紫外可見分光光度計(jì)排行</p><p style="text-indent:25px">上海儀電分析儀器有限公司主營(yíng)品牌有儀電分析,上分，發(fā)展規(guī)模團(tuán)隊(duì)不斷壯大，該公司生產(chǎn)型的公司。公司是一家有限責(zé)任公司企業(yè)，以誠(chéng)信務(wù)實(shí)的創(chuàng)業(yè)精神、專業(yè)的管理團(tuán)隊(duì)、踏實(shí)的職工隊(duì)伍，努力為廣大用戶提供***的產(chǎn)品。公司始終堅(jiān)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(jì)，氣相色譜，原子吸收，食品安全。儀電分析將以真誠(chéng)的服務(wù)、創(chuàng)新的理念、***的產(chǎn)品，為彼此贏得全新的未來(lái)！</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/1858154.html</p></div></div></div></div></div><div id="hk38tvp" class="page-right twoColRt"><div id="bokrbrb" class="box01 margin10 clearfix"><h3><a 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