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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)品關鍵詞：</span>化工紫外可見分光光度計代理,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-15 04:18:15</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="ujqsjln" 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="uogvnz3" class="page-proshow02"><p class="title">詳細說明</p><div id="azmog3q" class="box"><p><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，化工紫外可見分光光度計代理，要是你測定溶液是有機物質，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，化工紫外可見分光光度計代理，還可以采取以下兩種方法。 </p> <p> 2，化工紫外可見分光光度計代理.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。紫外可見分光光度計，可以通過更換光源分別形成可見和紫外光區(qū)，測定的波長在200～1000nm?；ぷ贤饪梢姺止夤舛扔嫶?/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代理,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593139440396/4585287.png"></div><p> 可見分光光度計，紫外分光光度計和紫外可見分光光度計有什么區(qū)別? </p> <p> 可見分光光度計和紫外分光光度計的區(qū)別是測定波長范圍不同，一般可見光波長范圍是400～1000nm,紫外光波長范圍是200～400nm。所謂紫外可見分光光度計也就是說這個儀器可以通過更換光源形成紫外和可見的光區(qū)，能夠測定吸收峰在紫外和可見光部分的化合物。一般測定波長在200～1000nm。 </p> <p> 分光光度計的關鍵參數(shù)有哪些? </p> <p> 選擇可見和紫外可見的分光光度計所關注的關鍵的指標有三點：一是波長范圍，二是波長準確度，三是雜散光參數(shù)。波長范圍的選擇是由用戶實驗需要所定，波長范圍越寬的價格越貴;波長準確度及雜散光參數(shù)的數(shù)值越低，表示性能越好。中端紫外可見分光光度計銷售廠家例如測試紫外區(qū)時則可關閉紫外分光光度計鎢燈；反之關閉氘燈。這樣就延長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="化工紫外可見分光光度計代理,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593808795839/2949755.png"></div><p> 紫外分光光度計的單色器是將光源發(fā)出的連續(xù)光譜分解成單色光，并能準確方便地“取出”所需要的某一波長的光的光學裝置，它是光度計的心臟。單色器主要由狹縫、色散元件和透鏡系統(tǒng)組成。其中色散元件是單色器的主要部件。常用的色散元件是棱鏡、光柵，或者是兩者的組合。 </p> <p> 棱鏡單色器是利用不同波長的光在棱鏡內折射率不同將復合光色散為單色光，這種現(xiàn)象稱為棱鏡的色散作用。常用的棱鏡由玻璃或石英制成?？梢姽夥秶２捎貌ＡЮ忡R，其色散力強，價格低廉，但是玻璃吸收紫外光，所以不宜用于紫外光區(qū)。紫外光范圍常用石英作為材料，石英棱鏡的工作波長范圍為185~4000nm，在紫外光區(qū)有較好的分辨力，而且也適用于可見光區(qū)和近紅外光區(qū)。棱鏡單色器的特點是波長越短，色散程度越好。越趨向長波，色散程度越差，所以，單色器用棱鏡的分光光度計，其波長刻度在紫外光區(qū)可達到0.2nm，而在長波段，只能達到5nm。 </p><p> 眾所周知，紫外可見分光光度計的光源部需要經(jīng)常更換光源燈（鎢燈或氘燈），一般來說這種工作均由儀器廠家的工程師來進行；如果儀器用戶自己可以掌握這種更換和調整技術，既能節(jié)約等待時間又能節(jié)省維修費用，可謂一舉兩得。 </p> <p> 雖然有些用戶也曾經(jīng)自行嘗試過這種工作，但往往效果不太理想，究其原因則是沒有掌握要領，他們將這種更換光源燈的工作看做與更換室內照明燈泡的性質一樣，認為只要換上的光源燈被亮即萬事大吉；為此，我談談這方面的調整要領。 </p> <p> 一般簡易型分光光度計的光源室**設計了一支鎢燈來涵蓋整個波長區(qū)域的使用，由于鎢燈的能量在紫外區(qū)很弱，因此、此類儀器在紫外區(qū)的測量信號的噪聲較大。 </p> <p> 當然、也有**的紫外分光光度計，同理、光源燈就改用一支氘燈了。 </p> <p> <br /> </p> <p> 為了保障在190～1100nm區(qū)域內的高信噪比，目前的儀器均采用兩只光源燈互補使用，即在紫外區(qū)采用氘燈，而在可見區(qū)使用鎢燈，兩只燈的選擇采用旋轉光源鏡來切換。紫外分光光度計儀器使用一定周期后，由維修工程師或在工程師指導下定期開啟儀器外罩對內部進行除塵工作。</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代理,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（UV）引用新型技術，其功能強大，采用單色器技術，波長范圍190-1100nm，是各種涉及水和廢水分析領域的通用儀器，應用范圍包括市政和工業(yè)廢水，飲用水，加工過程用水，地表水，冷卻水和鍋爐補給水等。 </p> <p> 在水和廢水監(jiān)測中的應用，對于一個水系的監(jiān)測分析和綜合評價，一般包括水相（溶液本身）、固相（懸浮物、底質）、生物相（水生生物）。在水質的常規(guī)監(jiān)測中，紫外可見分光光度法占有較大的比重。由于水和廢水的成分復雜多變，待測物的濃度和干擾物的濃度差別很大，在具體分析時必須選擇好分析方法。 </p> <p> 在農產(chǎn)品和食品分析中可用于檢測的組分或成分有蛋白質、賴氨酸、葡萄糖、維生素C、硝酸鹽、亞硝酸鹽、砷、汞等; </p> <p> 在植物生化分析中可用于檢測葉綠素、全氮和酶的活力等； </p> <p> 在飼料分析中可用于檢測煙酸、棉酚、磷化氫和甲酯等。原理紫外可見吸收光譜主要產(chǎn)生于分子價電子在能級間的躍遷。利用一定頻率的紫外--可見光照射被分析的物質，引起分子中價電子的躍遷，它將有選擇地被吸收。吸收光譜可以反映出物質的特征。它對物質進行定性分析、定量分析及結構分析,所依據(jù)的光譜是分子或離子吸收入射光中特定波長的光而產(chǎn)生的吸收光譜。傳統(tǒng)單光束UV紫外測試，測試過程全程封閉，單光束光源只通過光柵直接照射樣品，再經(jīng)光電倍增管檢測器檢測。工廠紫外可見分光光度計性價比</p><p style="text-indent:25px">紫外可見吸收光譜是由于分子中的某些基團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?；ぷ贤饪梢姺止夤舛扔嫶?/p><p> 常見的可見分光光度計和紫外可見分光光度計的型號有哪些? </p> <p> 可見分光光度計常見的有721系列，722系列和723系列。721系列可見分光光度計有721/721-100型，測定波長為360-800nm，分為分指針和數(shù)顯式兩種方式的顯示器。其中721-100型相對于721是型將測試樣品室加寬，可用10cm的比色皿，為糖廠**檢測儀器。722系列可見分光光度計有722/722S/722N型，測定波長為330-1000nm/325-1000nm。722型波長是330-1000nm，722S與722N的波長范圍325-1000nm，其中722N是自動調節(jié)波長。723系列可見分光光度計有723/723N/723PC/723PCS型四種，測定波長為320-1000nm，其中723是手動調整波長，723N是自動調波長，723PC配有掃描軟件，723PCS帶有掃描軟件和打印機。紫外可見分光光度計常見的是UV752/UV752N，波長范圍是195nm-1020nm。二者<span style="display:none;"></span>主要區(qū)別是UV752N可以選配打印機將數(shù)據(jù)輸出，其中在雜散光參數(shù)，光譜帶寬等方面還有細微的差別。化工紫外可見分光光度計代理</p><p style="text-indent:25px">上海儀電分析儀器有限公司位于徐塘路88號7幢4層、9幢，擁有一支專業(yè)的技術團隊。專業(yè)的團隊大多數(shù)員工都有多年工作經(jīng)驗，熟悉行業(yè)專業(yè)知識技能，致力于發(fā)展儀電分析,上分的品牌。公司不**提供專業(yè)的儀器儀表、電子元器件及相關的系統(tǒng)集成的生產(chǎn)、服務及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術進出口業(yè)務。【依法須經(jīng)批準的項目，經(jīng)相關部門批準后方可開展經(jīng)營活動】儀器儀表、電子元器件及相關的系統(tǒng)集成的生產(chǎn)、服務及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術進出口業(yè)務。【依法須經(jīng)批準的項目，經(jīng)相關部門批準后方可開展經(jīng)營活動】，同時還建立了完善的售后服務體系，為客戶提供良好的產(chǎn)品和服務。誠實、守信是對企業(yè)的經(jīng)營要求，也是我們做人的基本準則。公司致力于打造***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/1995840.html</p></div></div></div></div></div><div id="croqnzw" class="page-right twoColRt"><div id="gvsfceb" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="scjgiu8" 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配件哪家強信息推薦自業(yè)物資供應" class="vcenter" 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