工廠紫外可見(jiàn)分光光度計(jì)差價(jià) 服務(wù)為先上海儀電分析儀器供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺(tái)【買(mǎi)產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="紫外分光光度計(jì)--注意事項(xiàng)1．該儀器應(yīng)放在干燥的房間內(nèi)，使用時(shí)放置在堅(jiān)固平穩(wěn)的工作臺(tái)上，室內(nèi)照明不宜太強(qiáng)。熱天時(shí)不能用電扇直接向儀器吹風(fēng)，防止燈泡燈絲發(fā)亮不穩(wěn)定。2．使用本儀器前，使用者應(yīng)該首先了解本儀器的結(jié)構(gòu)和工作原理，以及各個(gè)操縱旋鈕之"><meta name="keywords" content="工廠紫外可見(jiàn)分光光度計(jì)差價(jià),紫外可見(jiàn)分光光度計(jì)"><link rel="canonical" href="http://www.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> 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服務(wù)為先上海儀電分析儀器供應(yīng)</p><div id="dzd3rlz" class="leftbox clearfix"><h1>工廠紫外可見(jiàn)分光光度計(jì)差價(jià) 服務(wù)為先上海儀電分析儀器供應(yīng)</h1><div id="59nnt3l" class="proBig"><div id="59f35pl" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="hlzjbz5" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="hdp53rf" 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>工廠紫外可見(jiàn)分光光度計(jì)差價(jià),紫外可見(jiàn)分光光度計(jì)</p><p><span>***更新：</span>2020-11-26 12:35:20</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="rnrf53f" 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="fnd35bz" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="trflxdt" class="box"><p><p> 紫外分光光度計(jì)--注意事項(xiàng) </p> <p> 1．該儀器應(yīng)放在干燥的房間內(nèi)，使用時(shí)放置在堅(jiān)固平穩(wěn)的工作臺(tái)上，室內(nèi)照明不宜太強(qiáng)。熱天時(shí)不能用電扇直接向儀器吹風(fēng)，防止燈泡燈絲發(fā)亮不穩(wěn)定。 </p> <p> 2．使用本儀器前，使用者應(yīng)該首先了解本儀器的結(jié)構(gòu)和工作原理，以及各個(gè)操縱旋鈕之功能。在未按通電源之前，應(yīng)該對(duì)儀器的安全性能進(jìn)行檢查，工廠紫外可見(jiàn)分光光度計(jì)差價(jià)，電源接線應(yīng)牢固，通電也要良好，工廠紫外可見(jiàn)分光光度計(jì)差價(jià)，工廠紫外可見(jiàn)分光光度計(jì)差價(jià)，各個(gè)調(diào)節(jié)旋鈕的起始位置應(yīng)該正確，然后再按通電源開(kāi)關(guān)。 </p> <p> 3．在儀器尚未接通電源時(shí)，電表指針必須于“0”刻線上，若不是這種情況，則可以用電表上的校正螺絲進(jìn)行調(diào)節(jié)。例如測(cè)試紫外區(qū)時(shí)則可關(guān)閉紫外分光光度計(jì)鎢燈；反之關(guān)閉氘燈。這樣就延長(zhǎng)了那只不使用的光源燈的壽命。工廠紫外可見(jiàn)分光光度計(jì)差價(jià)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="工廠紫外可見(jiàn)分光光度計(jì)差價(jià),紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png"></div><p> 紫外可見(jiàn)分光光度計(jì)的特點(diǎn)分光光度法對(duì)于分析人員來(lái)說(shuō)，可以說(shuō)是常用和有效的工具之一。幾乎每一個(gè)分析實(shí)驗(yàn)室都離不開(kāi)紫外可見(jiàn)分光光度計(jì)。分光光度法具有以下主要特點(diǎn)。 </p> <p> 1靈敏度高 </p> <p> 由于新的顯色劑的大量合成，并在應(yīng)用研究方面取得了可喜的進(jìn)展，使得對(duì)元素測(cè)定的靈敏度有所推進(jìn)，特別是有關(guān)多元絡(luò)合物和各種表面活性劑的應(yīng)用研究，使許多元素的摩爾吸光系數(shù)由原來(lái)的幾萬(wàn)提高到數(shù)十萬(wàn)。 </p> <p> 2選擇性好 </p> <p> 目前已有些元素只要利用控制適當(dāng)?shù)娘@色條件就可直接進(jìn)行光度法測(cè)定，如鈷、鈾、鎳、銅、銀、鐵等元素的測(cè)定，已有比較滿意的方法了。 </p> <p> 3準(zhǔn)確度高 </p> <p> 對(duì)于一般的分光光度法，其濃度測(cè)量的相對(duì)誤差在1～3%范圍內(nèi)，如采用示差分光光度法進(jìn)行測(cè)量，則誤差可減少到0.X%。 </p> <p> 4適用濃度范圍廣 </p> <p> 可從常量(1%～50%)(尤其使用示差法)到痕量(10-8～10-6%)(經(jīng)預(yù)富集后)。 </p> <p> 5分析成本低、操作簡(jiǎn)便、快速、應(yīng)用廣 </p> <p> 由于各種各樣的無(wú)機(jī)物和有機(jī)物在紫外可見(jiàn)區(qū)都有吸收，因此均可借此法加以測(cè)定。到目前為止，幾乎化學(xué)元素周期表上的所有元素(除少數(shù)放射性元素和惰性元素之外)均可采用此法。在國(guó)際上發(fā)表的有關(guān)分析的論文總數(shù)中，光度法約占28%，我國(guó)約占所發(fā)表論文總數(shù)的33%。材料紫外可見(jiàn)分光光度計(jì)排名在大部分的樣品類(lèi)型中，分光光度計(jì)可接受樣品孔、小玻璃管cuvette、吸漿管和微孔板。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="工廠紫外可見(jiàn)分光光度計(jì)差價(jià),紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png"></div><p> 紫外-可見(jiàn)吸收光譜為什么有些化合物是有色的，而另一些化合物卻沒(méi)有？共軛與顏色有什么關(guān)系？我們必須對(duì)光譜中可見(jiàn)光部分和附近的不同波長(zhǎng)處的光吸收進(jìn)行精確測(cè)量。商業(yè)光譜儀可對(duì)光譜中近紫外和可見(jiàn)部分光吸收進(jìn)行精確測(cè)量。 </p> <p> 可見(jiàn)光區(qū)域的光子能量為36-72kcal/mol，近紫外線區(qū)域（至200nm）的能量范圍擴(kuò)展至143kcal/mole。波長(zhǎng)小于200nm的紫外線輻射難以處理，因此很少用作結(jié)構(gòu)分析的常規(guī)工具。 </p> <p> 當(dāng)一束光照射物質(zhì)時(shí)，上述能量會(huì)激發(fā)分子電子至更高能量的軌道。下圖顯示了有機(jī)分子中發(fā)生的各種電子激發(fā)的示意圖，其包含六個(gè)躍遷。通常，只有三個(gè)低能量躍遷是通過(guò)200至800nm光的能量實(shí)現(xiàn)的，也就是說(shuō)，能夠吸收200-800nm區(qū)域光的分子應(yīng)具有π電子系統(tǒng)和具有未成對(duì)電子對(duì)的雜原子。這種吸光基團(tuán)稱為生色團(tuán)。 </p> <p> 當(dāng)樣品分子暴露于具有與分子內(nèi)可能的電子躍遷相匹配能量的光時(shí)，電子受光子激發(fā)從高的占據(jù)分子軌道（HOMO）躍遷到低的未占據(jù)分子軌道（LUMO），一些光能將被吸收，所產(chǎn)生的物質(zhì)稱為激發(fā)態(tài)物質(zhì)。光譜儀記錄吸收波長(zhǎng)以及每個(gè)波長(zhǎng)的吸收程度，所得光譜用吸光度（A）與波長(zhǎng)的關(guān)系圖表示。吸光度通常在0（無(wú)吸收）到2（99％吸收）的范圍內(nèi)。 </p><p> 紫外吸收光譜能測(cè)定化合物中含有微量的具有紫外吸收的雜質(zhì)。如果化合物的紫外可見(jiàn)光區(qū)沒(méi)有明顯的吸收峰，而它的雜質(zhì)在紫外區(qū)內(nèi)有較強(qiáng)的吸收峰，就可以檢測(cè)出化合物中的雜質(zhì)。 </p> <p> 不同的極性溶劑產(chǎn)生氫鍵的強(qiáng)度也不同，這可以利用紫外光譜來(lái)判斷化合物在不同溶劑中氫鍵強(qiáng)度，以確定選擇哪一種溶劑。 </p> <p> 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(jiàn)區(qū)是有吸收的，我們可以用分光光度法來(lái)研究其組成。根據(jù)吸收光譜圖上的一些特征吸收，特別是MAX吸收波長(zhǎng)λmax和摩爾吸收系數(shù)ε，是檢定物質(zhì)的常用物理參數(shù)。 </p> <p> 將分析樣品和標(biāo)準(zhǔn)樣品以相同濃度配制在同一溶劑中，在同一條件下分別測(cè)定紫外可見(jiàn)吸收光譜。若兩者是同一物質(zhì)，則兩者的光譜圖應(yīng)完全一致。如果沒(méi)有標(biāo)樣，也可以和現(xiàn)成的標(biāo)準(zhǔn)譜圖對(duì)照進(jìn)行比較。 </p> <p> 由于紫外吸收光譜只含有2～3個(gè)較寬的吸收帶，而紫外光譜主要是分子內(nèi)的發(fā)色團(tuán)在紫外區(qū)產(chǎn)生的吸收，與分子和其它部分關(guān)系不大。具有相同發(fā)色團(tuán)的不同分子結(jié)構(gòu)，在較大分子中不影響發(fā)色團(tuán)的紫外吸收光譜，不同的分子結(jié)構(gòu)有可能有相同的紫外吸收光譜，但它們的吸收系數(shù)是有差別的。如果分析樣品和標(biāo)準(zhǔn)樣品的吸收波長(zhǎng)相同，吸收系數(shù)也相同，則可認(rèn)為分析樣品與標(biāo)準(zhǔn)樣品為同一物質(zhì)。紫外可見(jiàn)分光光度計(jì)基本工作原理和紅外光譜儀相似，利用一定頻率的紫外可見(jiàn)光照射被分析的有機(jī)物質(zhì)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="工廠紫外可見(jiàn)分光光度計(jì)差價(jià),紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593808795839/2949755.png"></div><p style="text-indent:25px">紫外-可見(jiàn)分光光度計(jì)的類(lèi)型很多，根據(jù)儀器結(jié)構(gòu)可分為單光束分光光度計(jì)、雙光束分光光度計(jì)和雙波長(zhǎng)分光光度計(jì)三種，其中單光束分光光度計(jì)和雙光束分光光度計(jì)屬于單波長(zhǎng)分光光度計(jì)。1.單光束分光光度計(jì)從光源發(fā)出的光經(jīng)單色器分光后得到一束單色光，通過(guò)吸收池后，然后照射在檢測(cè)器上始終為一束光，如下圖所示。該類(lèi)型的分光光度計(jì)結(jié)構(gòu)簡(jiǎn)單、價(jià)格便宜，但由于其雜散光、光源波動(dòng)等影響很大，所以準(zhǔn)確度較差。雙光束分光光度計(jì)從光源發(fā)出的復(fù)合光經(jīng)單色器分光后的單色光被反射鏡（切光器）分為強(qiáng)度相等的兩束光，分別通過(guò)參比溶液和樣品溶液，如下圖所示。由于兩束光同時(shí)通過(guò)參比溶液和樣品溶液，因此能夠自動(dòng)消除光源強(qiáng)度變化所引起的誤差。雙光束分光光度計(jì)一般能自動(dòng)記錄吸收光譜曲線，其靈敏度較好，但結(jié)構(gòu)較復(fù)雜、價(jià)格較貴?，F(xiàn)在的許多紫外分光光度計(jì)裝的是“長(zhǎng)壽”型燈源，據(jù)說(shuō)氘燈可達(dá)2000小時(shí)，鎢燈3000小時(shí)。高性能紫外可見(jiàn)分光光度計(jì)排名</p><p style="text-indent:25px">測(cè)量吸光度并不是測(cè)量透過(guò)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，稱為紫外分光光度計(jì)的檢測(cè)器。工廠紫外可見(jiàn)分光光度計(jì)差價(jià)</p><p> 我們都知道，紫外-可見(jiàn)分光光度計(jì)是實(shí)驗(yàn)室中出鏡率相當(dāng)高的分析儀器。 </p> <p> 那么你的使用情況如何呢？ </p> <p> 你所關(guān)注紫外-可見(jiàn)分光光度計(jì)的哪些性能？ </p> <p> 大家都來(lái)說(shuō)說(shuō)吧！分光光度法是通過(guò)測(cè)定被測(cè)物質(zhì)，在特定波長(zhǎng)處或一定波長(zhǎng)范圍內(nèi)光的吸光度或發(fā)光強(qiáng)度，對(duì)該物質(zhì)進(jìn)行定性和定量分析的方法。紫外-可見(jiàn)分光光度計(jì)是元析儀器引用新型技術(shù)，其功能強(qiáng)大，采用單色器技術(shù)，波長(zhǎng)范圍190-1100nm，是各種涉及水和廢水分析領(lǐng)域的通用儀器，應(yīng)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(guò)程用水，地表水，冷卻水和鍋爐補(bǔ)給水等液體的分析。工廠紫外可見(jiàn)分光光度計(jì)差價(jià)</p><p style="text-indent:25px">上海儀電分析儀器有限公司是一家儀器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷(xiāo)售，計(jì)算機(jī)軟件開(kāi)發(fā)及銷(xiāo)售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)。【依法須經(jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】?jī)x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(xiāo)售，計(jì)算機(jī)軟件開(kāi)發(fā)及銷(xiāo)售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)?！疽婪毥?jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】的公司，是一家集研發(fā)、設(shè)計(jì)、生產(chǎn)和銷(xiāo)售為一體的專(zhuān)業(yè)化公司。儀電分析擁有一支經(jīng)驗(yàn)豐富、技術(shù)創(chuàng)新的專(zhuān)業(yè)研發(fā)團(tuán)隊(duì)，以高度的專(zhuān)注和執(zhí)著為客戶提供分光光度計(jì)，氣相色譜，原子吸收，食品安全。儀電分析繼續(xù)堅(jiān)定不移地走高質(zhì)量發(fā)展道路，既要實(shí)現(xiàn)基本面穩(wěn)定增長(zhǎng)，又要聚焦關(guān)鍵領(lǐng)域，實(shí)現(xiàn)轉(zhuǎn)型再突破。儀電分析始終關(guān)注儀器儀表行業(yè)。滿足市場(chǎng)需求，提高產(chǎn)品價(jià)值，是我們前行的力量。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2153842.html</p></div></div></div></div></div><div id="hnt3hbf" 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