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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>可靠紫外可見分光光度計(jì)賣價(jià),紫外可見分光光度計(jì)</p><p><span>***更新：</span>2020-11-01 07:21:21</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="39giur8" 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="8no3eqk" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="yspmta3" class="box"><p><p> 使用紫外分光光度計(jì)的過程中，經(jīng)常會(huì)遇到儀器因光源達(dá)不到要求，需要進(jìn)行調(diào)修。要求光源燈處不能有空氣流動(dòng)，因?yàn)閱喂馐鴥x器很忌諱空氣快速流動(dòng)而使光源燈的色溫發(fā)生變化。如遇電壓正常而鎢燈不亮?xí)r，就需要更換鎢燈。更換時(shí)，不要用手直接接觸燈泡表面，如果手指摸過，應(yīng)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(diào)整光路。光源燈有兩個(gè)引線頭，安裝時(shí)用導(dǎo)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(shí)防止焊點(diǎn)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(huì)影響光能量。燈絲的位置要與入射狹縫平行并對(duì)準(zhǔn)，上、下、左、右調(diào)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?yàn)槎鄶?shù)燈絲離燈頭偏高。調(diào)整燈位置的前后可移動(dòng)整個(gè)燈座架，它下面有三個(gè)固定螺釘，先稍松后，移動(dòng)前后位置再固定。一般調(diào)節(jié)鎢燈的位置時(shí)，將波長(zhǎng)調(diào)到580nm處，狹縫調(diào)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，可靠紫外可見分光光度計(jì)賣價(jià)，可能是光源燈高度不對(duì)；光斑左邊或右邊不完整，可調(diào)光源燈底座位置，可靠紫外可見分光光度計(jì)賣價(jià)。調(diào)整至白紙上可見明亮，可靠紫外可見分光光度計(jì)賣價(jià)、均勻的長(zhǎng)方形黃橙色光斑。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?？煽孔贤饪梢姺止夤舛扔?jì)賣價(jià)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="可靠紫外可見分光光度計(jì)賣價(jià),紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png"></div><p> 進(jìn)行單波長(zhǎng)測(cè)量時(shí)，需要考慮朗伯比爾定律對(duì)入射光單色性的要求和測(cè)定靈敏度的要求。沒有干擾時(shí)，一般選擇在吸收峰的MAX吸收波長(zhǎng)位置處，如果有干擾，選擇在沒有干擾且吸光度變化較平緩的位置。進(jìn)行多波長(zhǎng)校正時(shí)，除盡量滿足單波長(zhǎng)測(cè)定的波長(zhǎng)要求外，還要求多個(gè)組分間的吸收光譜間線性無關(guān)。 </p> <p> 紫外分光光度計(jì)狹縫的大小會(huì)影響到儀器的信噪比和標(biāo)準(zhǔn)曲線的線性范圍。狹縫過大，通常會(huì)使線性范圍變小，特別是當(dāng)不在MAX吸收波長(zhǎng)位置測(cè)定時(shí)更是如此。狹縫過小，信噪比變差，基線平直度和測(cè)量數(shù)據(jù)的重復(fù)性會(huì)變差。此外，還需要考慮樣品吸收峰寬度的影響。通常單波長(zhǎng)測(cè)定時(shí)，一般選擇在MAX吸收波長(zhǎng)位置，線性范圍容易滿足，可選擇較寬的狹縫（1~2nm）多波長(zhǎng)測(cè)定時(shí)，很難同時(shí)在所有波長(zhǎng)都滿足線性范圍要求，應(yīng)選擇比較小的狹縫。元素紫外可見分光光度計(jì)報(bào)價(jià)紫外可見分光光度計(jì)，可以通過更換光源分別形成可見和紫外光區(qū)，測(cè)定的波長(zhǎng)在200～1000nm。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="可靠紫外可見分光光度計(jì)賣價(jià),紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png"></div><p> 紫外分光光度計(jì)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(zhǔn)確方便地“取出”所需要的某一波長(zhǎng)的光的光學(xué)裝置，它是光度計(jì)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(zhǎng)的光在棱鏡內(nèi)折射率不同將復(fù)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(qiáng)，價(jià)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(zhǎng)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(diǎn)是波長(zhǎng)越短，色散程度越好。越趨向長(zhǎng)波，色散程度越差，所以，單色器用棱鏡的分光光度計(jì)，其波長(zhǎng)刻度在紫外光區(qū)可達(dá)到0.2nm，而在長(zhǎng)波段，只能達(dá)到5nm。 </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. </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. </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(jì)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(gè)能量差（透過率）來計(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）來計(jì)算出濃度。為了選擇合適的狹縫寬度，應(yīng)以減少狹縫寬度時(shí)紫外分光光度計(jì)試樣的吸光度不再增加為準(zhǔn)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="可靠紫外可見分光光度計(jì)賣價(jià),紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593893024301/8360761.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。使用紫外分光光度計(jì)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(shí)驗(yàn)室。生產(chǎn)紫外可見分光光度計(jì)性價(jià)比</p><p style="text-indent:25px">紫外可見分光光度計(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光照射被分析的有機(jī)物質(zhì)?？煽孔贤饪梢姺止夤舛扔?jì)賣價(jià)</p><p> 當(dāng)你什么都不了解的情況下，只選貴的，準(zhǔn)沒錯(cuò)。在某種程度上，這句話具有一定的適用性。但是，新型儀器一般價(jià)格較貴，如果過度放寬儀器預(yù)算，而追加經(jīng)費(fèi)采購不需要的配件也是一種浪費(fèi)。如何快速簡(jiǎn)單的掌握紫外可見分光光度計(jì)的特性，從而進(jìn)行合適的采購定位，小編將所需要的知識(shí)點(diǎn)總結(jié)如下。 </p> <p> 認(rèn)識(shí)紫外可見光分光光度計(jì)使用范圍。任何一臺(tái)儀器都不是解決所有問題的同一把鑰匙。多問自己幾個(gè)問題：需要一臺(tái)什么樣的儀器，要用它來做什么，分析的樣品的形態(tài)、所需要的測(cè)試范圍以及精度要求在哪里等等。理清楚這些，儀器的基本輪廓就畫出來了。 </p> <p> 紫外可見光分光光度計(jì)作為一種常規(guī)的實(shí)驗(yàn)室分析儀器，可以常用于無機(jī)物、有機(jī)物的定性定量分析，所使用的科研領(lǐng)域包括：科研、制藥、化工、環(huán)保、衛(wèi)生等需要分析的關(guān)鍵領(lǐng)域。可靠紫外可見分光光度計(jì)賣價(jià)</p><p style="text-indent:25px">上海儀電分析儀器有限公司總部位于徐塘路88號(hào)7幢4層、9幢，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)及銷售，計(jì)算機(jī)軟件開發(fā)及銷售，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)部門批準(zhǔn)后方可開展經(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)及銷售，計(jì)算機(jī)軟件開發(fā)及銷售，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)部門批準(zhǔn)后方可開展經(jīng)營(yíng)活動(dòng)】的公司。儀電分析作為儀器儀表、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(jì)算機(jī)軟件開發(fā)及銷售，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)部門批準(zhǔn)后方可開展經(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)及銷售，計(jì)算機(jī)軟件開發(fā)及銷售，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)部門批準(zhǔn)后方可開展經(jīng)營(yíng)活動(dòng)】的企業(yè)之一，為客戶提供良好的分光光度計(jì)，氣相色譜，原子吸收，食品安全。儀電分析致力于把技術(shù)上的創(chuàng)新展現(xiàn)成對(duì)用戶產(chǎn)品上的貼心，為用戶帶來良好體驗(yàn)。儀電分析始終關(guān)注儀器儀表市場(chǎng)，以敏銳的市場(chǎng)洞察力，實(shí)現(xiàn)與客戶的成長(zhǎng)共贏。</p></p><br 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