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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>化工紫外可見分光光度計賣價,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-17 08:22:25</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="v7z3lpv" 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: </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="2kv37rx" class="page-proshow02"><p class="title">詳細說明</p><div id="ixbc8xj" class="box"><p><p> 掌握紫外可見光分光光度計基本工作原理：一定頻率紫外可見光照射所需要分析的目標(biāo)樣品，引起目標(biāo)樣品中價電子發(fā)生躍遷，從而變現(xiàn)隨著吸收波長變化而引起光譜變化，形成可供分析數(shù)據(jù)。 </p> <p> 以朗伯-比耳定律(Lambert-beer)為理論基礎(chǔ)，特定波長吸收中，吸收程度正比于試樣成分濃度，因此，可進行光譜的定性分析。且根據(jù)吸收與已知濃度標(biāo)樣比較，能進行定量分析。 </p> <p> 紫外可見光分光光度計種類及優(yōu)缺點對比：傳統(tǒng)機型：單光束UV、全程密閉、以光柵進行分光，標(biāo)樣和測試樣品分別測試，化工紫外可見分光光度計賣價，化工紫外可見分光光度計賣價，全波段掃描時間至多2min；比例雙光束UV：單光束UV，全程密閉、經(jīng)光柵再經(jīng)棱鏡，全程密閉、標(biāo)樣和測試樣品分別測試，化工紫外可見分光光度計賣價、測試靈敏度降低，全波段分析時間長。紫外可見分光光度計在開機前將樣品室內(nèi)的干燥劑取出，儀器自檢過程中禁止打開樣品室蓋?；ぷ贤饪梢姺止夤舛扔嬞u價</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="化工紫外可見分光光度計賣價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593139440396/4585287.png"></div><p> 紫外可見分光光度計的比色皿的洗滌方法 </p> <p> 1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：要是你測定溶液是酸，如果不干凈，就用弱堿溶液洗，要是你測定溶液是堿，如果不干凈，就用弱酸溶液洗，要是你測定溶液是有機物質(zhì)，如果不干凈，就用有機溶劑，比如酒精等溶液洗。 </p> <p> 2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。 </p> <p> 2.1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> 2.2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，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。高性能紫外可見分光光度計經(jīng)銷商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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="化工紫外可見分光光度計賣價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png"></div><p> 可見分光光度計是一種常規(guī)的實驗室分析儀器?？沙Ｓ糜跓o機物、有機物的定性、定量分析中，在科研、制藥、化工、環(huán)保、衛(wèi)生、防疫等領(lǐng)域中發(fā)揮重要的作用。有人說，紫外、可見分光光度計就是一把尺子一個天平，凡是有化驗、分析的地方都能用到它。那么，如何評價一臺紫外、可見分光光度計的優(yōu)劣呢? </p> <p> 要考察它的外觀。試想，一臺外型呆板、做工粗糙的儀器，怎么可能是一臺先進的儀器呢? </p> <p> 我們探討一下會對儀器的使用有很大影響的幾個重要指標(biāo) </p> <p> <p> 1、光度準(zhǔn)確度 </p> <p> 2、雜散光 </p> <p> 3、光譜帶寬 </p> <p> 4、穩(wěn)定性 </p> <p> 5、噪聲 </p> <p> 6、波長的準(zhǔn)確度和重復(fù)性 </p> <p> <br /> </p> </p><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> 開機前應(yīng)先預(yù)熱15分鐘，然后開機自檢； </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。紫外可見分光光度計是實驗室中出鏡率相當(dāng)高的分析儀器。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="化工紫外可見分光光度計賣價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png"></div><p> 什么是紫外可見分光光度計？紫外可見分光光度計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都有重要的應(yīng)用。 </p> <p> 分光光度計是杜包斯克(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)計了第1臺比色計。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。此后，紫外可見分光光度計經(jīng)不斷改進，又出現(xiàn)自動記錄、自動打印、數(shù)字顯示、微機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)各個部門和科學(xué)研究的各個領(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和固定光柵式分光光度計。 </p> <p> <br /> 使用紫外分光光度計應(yīng)具備四季恒濕的儀器室，配置恒溫設(shè)備，特別是地處南方地區(qū)的實驗室。便攜紫外可見分光光度計</p><p style="text-indent:25px">一般來說，紫外光分光光度計分為單光束和雙光束兩類。化工紫外可見分光光度計賣價</p><p> 紫外可見分光光度計條件設(shè)定 </p> <p> 在定量分析中，為了提高測定的靈敏度，入射光的波長應(yīng)選擇被測物的MAX吸收波長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，不僅能提高測定的靈敏度，還能提高測定的準(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，入射光的強減弱。狹縫寬度過大或過小均會造成靈敏度降低，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)小于待測樣品吸收帶的半寬度，否則測得的吸光度值會偏低，狹縫寬度的選擇應(yīng)以減少狹縫寬度時供試品的吸光度不再；加為準(zhǔn)，對于大部分被測品種，可以使用2nm縫寬。 </p> <p> 可通過控制被測物濃度或改變吸收池厚度來實現(xiàn)吸光度合理的范圍，以盡量減小測量誤差。一般吸光度盡量控制在0.1-0.8范圍。 </p> <p> 空白溶液是用來調(diào)節(jié)吸光度測量工作零點即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入射光的反射和吸收所帶來的誤差。根據(jù)情況不同，常用空白溶液有如下幾種選擇。 </p> <p> <br /> 化工紫外可見分光光度計賣價</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)及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術(shù)進出口業(yè)務(wù)?！疽婪毥?jīng)批準(zhǔn)的項目，經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營活動】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)及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術(shù)進出口業(yè)務(wù)。【依法須經(jīng)批準(zhǔn)的項目，經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營活動】，是一家儀器儀表的企業(yè)，擁有自己**的技術(shù)體系。一批專業(yè)的技術(shù)團隊，是實現(xiàn)企業(yè)戰(zhàn)略目標(biāo)的基礎(chǔ)，是企業(yè)持續(xù)發(fā)展的動力。公司以誠信為本，業(yè)務(wù)領(lǐng)域涵蓋分光光度計，氣相色譜，原子吸收，食品安全，我們本著對客戶負責(zé)，對員工負責(zé)，更是對公司發(fā)展負責(zé)的態(tài)度，爭取做到讓每位客戶滿意。公司深耕分光光度計，氣相色譜，原子吸收，食品安全，正積蓄著更大的能量，向更廣闊的空間、更寬泛的領(lǐng)域拓展。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2027690.html</p></div></div></div></div></div><div id="pzkf3wi" class="page-right twoColRt"><div id="nw8q8lh" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="pyfhoxy" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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