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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="lsoahiz" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593893024301/8360761.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="wpwnkg3" 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>產品關鍵詞：</span>暗箱紫外可見分光光度計設備,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-16 02:17:03</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="27uqc8c" 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="wypwhnp" class="page-proshow02"><p class="title">詳細說明</p><div id="pcokbsd" class="box"><p><p> 紫外可見分光光度計的發(fā)展分光光度法在分析領域中的應用已經有數(shù)十年的歷史，至今仍是應用常用的分析方法之一。隨著分光元器件及分光技術、檢測器件與檢測技術、大規(guī)模集成制造技術等的發(fā)展，以及單片機、微處理器、計算機和DSP技術的應用，分光光度計的性能指標不斷提高，并向自動化、智能化、高速化和小型化等方向發(fā)展。 </p> <p> 在分光元器件方面，經歷了棱鏡、機刻光柵和全息光柵的過程，商品化的全息閃耀光柵已迅速取代一般刻劃光柵。在儀器控制方面，隨著單片機、微處理器的出現(xiàn)以及軟硬件技術的結合，從早期的人工控制進步到了自動控制。在顯示、記錄與繪圖方面，早期采用表頭(電位計)指示、繪圖儀繪圖，后來用數(shù)字電壓表數(shù)字顯示，如今更多地采用液晶屏幕或計算機屏幕顯示。在檢測器方面，早期使用光電池、光電管，暗箱紫外可見分光光度計設備，后來更普遍地使用光電倍增管甚至光電二極管陣列。陣列型檢測器和凹面光柵的聯(lián)合應用，使儀器的測量速度發(fā)生了質的飛躍，且性能更加穩(wěn)定可靠，受到儀器用戶的青睞，在儀器構型方面，暗箱紫外可見分光光度計設備，從單光束發(fā)展為雙光束，現(xiàn)在幾乎所有高級分光光度計都是雙光束的，有些高精度的儀器采用雙單色器，暗箱紫外可見分光光度計設備。使用紫外分光光度計應具備四季恒濕的儀器室，配置恒溫設備，特別是地處南方地區(qū)的實驗室。暗箱紫外可見分光光度計設備</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="暗箱紫外可見分光光度計設備,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593893024301/8360761.png"></div><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樣品，引起目標樣品中價電子發(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，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，標樣和測試樣品分別測試，全波段掃描時間至多2min；比例雙光束UV：單光束UV，全程密閉、經光柵再經棱鏡，全程密閉、標樣和測試樣品分別測試、測試靈敏度降低，全波段分析時間長。暗箱紫外可見分光光度計設備在分光光度計的使用或檢定中,透射比(吸光度)的準確度直接關系到所測數(shù)據(jù)的可信性及科學性。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="暗箱紫外可見分光光度計設備,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png"></div><p> 我們都知道，紫外-可見分光光度計是實驗室中出鏡率相當高的分析儀器。 </p> <p> 那么你的使用情況如何呢？ </p> <p> 你所關注紫外-可見分光光度計的哪些性能？ </p> <p> 大家都來說說吧！分光光度法是通過測定被測物質，在特定波長處或一定波長范圍內光的吸光度或發(fā)光強度，對該物質進行定性和定量分析的方法。紫外-可見分光光度計是元析儀器引用新型技術，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，應用范圍包括化工分析以及市政和工業(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液體的分析。 </p>紫外可見分光光度計的基本結構 <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，未被吸收的光經檢測器的光電管將光強度變化轉變?yōu)殡娦盘栕兓?，并經信號顯示系統(tǒng)調制放大后，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。為了選擇合適的狹縫寬度，應以減少狹縫寬度時紫外分光光度計試樣的吸光度不再增加為準。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="暗箱紫外可見分光光度計設備,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593139440396/4585287.png"></div><p> 使用紫外分光光度計的過程中，經常會遇到儀器因光源達不到要求，需要進行調修。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時，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整光路。光源燈有兩個引線頭，安裝時用導線焊接，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，上、下、左、右調節(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。一般調節(jié)鎢燈的位置時，將波長調到580nm處，狹縫調到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，可調光源燈底座位置。調整至白紙上可見明亮、均勻的長方形黃橙色光斑。按所吸收光的波長區(qū)域不同，分為紫外分光光度法和可見分光光度法，合稱為紫外-可見分光光度法。暗箱紫外可見分光光度計設備</p><p style="text-indent:25px">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。暗箱紫外可見分光光度計設備</p><p> 原子吸收分光光度計與紫外可見分光光度計的區(qū)別介紹 </p> <p> 原理： </p> <p> 原子吸收觀察的是構成物質的元素（原子）中的電子在原子軌道中的躍遷，屬于原子吸收. </p> <p> 紫外可見光吸收觀察的是構成物質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. </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，原子吸收分光光度計是用較高的溫度來燃燒分子，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，通過這個能量差（透過率）來計算出濃度。而紫外—可見分光光度計是通過顯色劑（一種能和我們被測元素產生絡合反應的分子），與我們的被測元素產生反應，并且反應物分子帶有特定的顏色，經過分子吸收氘燈（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）來計算出濃度。暗箱紫外可見分光光度計設備</p><p style="text-indent:25px">上海儀電分析儀器有限公司辦公設施齊全，辦公環(huán)境優(yōu)越，為員工打造良好的辦公環(huán)境。專業(yè)的團隊大多數(shù)員工都有多年工作經驗，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。我公司擁有強大的技術實力，多年來一直專注于儀器儀表、電子元器件及相關的系統(tǒng)集成的生產、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。【依法須經批準的項目，經相關部門批準后方可開展經營活動】儀器儀表、電子元器件及相關的系統(tǒng)集成的生產、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。【依法須經批準的項目，經相關部門批準后方可開展經營活動】的發(fā)展和創(chuàng)新，打造高指標產品和服務。上海儀電分析儀器有限公司主營業(yè)務涵蓋分光光度計，氣相色譜，原子吸收，食品安全，堅持“質量保證、良好服務、顧客滿意”的質量方針，贏得廣大客戶的支持和信賴。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2006384.html</p></div></div></div></div></div><div id="iggsopq" 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