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class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="dk37h3u" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="eqmn7y3" 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>民用紫外可見分光光度計(jì)報(bào)價(jià),紫外可見分光光度計(jì)</p><p><span>***更新：</span>2021-01-12 07:13:39</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="wzqciev" 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="e8fb2pt" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="hughi3a" class="box"><p><p> 為了保障在190～1100nm區(qū)域內(nèi)的高信噪比，目前的儀器均采用兩只光源燈互補(bǔ)使用，即在紫外區(qū)采用氘燈，而在可見區(qū)使用鎢燈，民用紫外可見分光光度計(jì)報(bào)價(jià)，兩只燈的選擇采用旋轉(zhuǎn)光源鏡來切換。 </p> <p> 眾所周知，紫外可見分光光度計(jì)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(jìn)行；如果儀器用戶自己可以掌握這種更換和調(diào)整技術(shù)，既能節(jié)約等待時(shí)間又能節(jié)省維修費(fèi)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(lǐng)，他們將這種更換光源燈的工作看做與更換室內(nèi)照明燈泡的性質(zhì)一樣，認(rèn)為只要換上的光源燈被亮即萬事大吉；為此，我談?wù)勥@方面的調(diào)整要領(lǐng)。 </p> <p> 一般簡(jiǎn)易型分光光度計(jì)的光源室**設(shè)計(jì)了一支鎢燈來涵蓋整個(gè)波長(zhǎng)區(qū)域的使用，由于鎢燈的能量在紫外區(qū)很弱，民用紫外可見分光光度計(jì)報(bào)價(jià)，因此、此類儀器在紫外區(qū)的測(cè)量信號(hào)的噪聲較大。 </p> <p> 也有**的紫外分光光度計(jì)，民用紫外可見分光光度計(jì)報(bào)價(jià)，同理、光源燈就改用一支氘燈了。在大部分的樣品類型中，分光光度計(jì)可接受樣品孔、小玻璃管cuvette、吸漿管和微孔板。民用紫外可見分光光度計(jì)報(bào)價(jià)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="民用紫外可見分光光度計(jì)報(bào)價(jià),紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><p> 使用紫外可見分光光度計(jì)時(shí)需要注意哪些方面？ </p> <p> 使用的吸收池必須潔凈，并注意配對(duì)使用。量瓶、移液吸管均應(yīng)校正、洗凈后使用。 </p> <p> 取吸收池時(shí)，手指應(yīng)拿毛玻璃面的兩側(cè)，裝盛樣品以池體的4/5為度，使用揮發(fā)性溶液時(shí)應(yīng)加蓋，透光面要用擦鏡紙由上而下擦拭干凈，檢視應(yīng)無溶劑殘留。吸收池放入樣品室時(shí)應(yīng)注意方向相同。用后用溶劑或水沖洗干凈，晾干防塵保存。 </p> <p> 供試品溶液濃度除各該品種已有注明外，其吸收度以在0.3～0.7之間為宜。 </p> <p> 測(cè)定時(shí)除另有規(guī)定外，應(yīng)以配制供試品溶液的同批溶劑為空白對(duì)照，采用1cm石英吸收池，在規(guī)定的吸收峰±2nm以內(nèi)，測(cè)幾個(gè)點(diǎn)的吸收度或由儀器在規(guī)定的波長(zhǎng)附近自動(dòng)掃描測(cè)定，以核對(duì)供試品的吸收峰位置是否正確，并以吸收度MAX的波長(zhǎng)作為測(cè)定波長(zhǎng)，除另有規(guī)定外吸收度MAX波長(zhǎng)應(yīng)在該品種項(xiàng)下規(guī)定的測(cè)定波長(zhǎng)±2nm以內(nèi)。 </p> <p> 供試品應(yīng)取2份，如為對(duì)照品比較法，對(duì)照品一般也應(yīng)取2份。平行操作，每份結(jié)果對(duì)平均值的偏差應(yīng)在±0.5%以內(nèi)。 </p> <p> 選用儀器的狹縫寬度應(yīng)小于供試品吸收帶的半寬度，否則測(cè)得的吸收度值會(huì)偏低，狹縫寬度的選擇應(yīng)以減少狹縫寬度時(shí)供試品的吸收度不再增加為準(zhǔn)，對(duì)于大部分被測(cè)品種，可以使用2nm縫寬。民用紫外可見分光光度計(jì)報(bào)價(jià)紫外可見分光光度計(jì)是實(shí)驗(yàn)室中出鏡率相當(dāng)高的分析儀器。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="民用紫外可見分光光度計(jì)報(bào)價(jià),紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594919157259/9098588.png"></div><p> 常見的可見分光光度計(jì)和紫外可見分光光度計(jì)的型號(hào)有哪些? </p> <p> 可見分光光度計(jì)常見的有721系列，722系列和723系列。721系列可見分光光度計(jì)有721/721-100型，測(cè)定波長(zhǎng)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(duì)于721是型將測(cè)試樣品室加寬，可用10cm的比色皿，為糖廠**檢測(cè)儀器。722系列可見分光光度計(jì)有722/722S/722N型，測(cè)定波長(zhǎng)為330-1000nm/325-1000nm。722型波長(zhǎng)是330-1000nm，722S與722N的波長(zhǎng)范圍325-1000nm，其中722N是自動(dòng)調(diào)節(jié)波長(zhǎng)。723系列可見分光光度計(jì)有723/723N/72**C/72**CS型四種，測(cè)定波長(zhǎng)為320-1000nm，其中723是手動(dòng)調(diào)整波長(zhǎng)，723N是自動(dòng)調(diào)波長(zhǎng)，72**C配有掃描軟件，72**CS帶有掃描軟件和打印機(jī)。紫外可見分光光度計(jì)常見的是UV752/UV752N，波長(zhǎng)范圍是195nm-1020nm。二者主要區(qū)別是UV752N可以選配打印機(jī)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(xì)微的差別。 </p><p> 吸收池是用于盛裝待測(cè)液并決定待測(cè)溶液透光液層厚度的器皿，又稱比色皿。吸收池一般為長(zhǎng)方體，也有圓形或其它形狀的。其底及兩側(cè)為毛玻璃，另兩面為光學(xué)透光面。根據(jù)光學(xué)透光面的材質(zhì)，吸收池又可分為玻璃吸收池和石英吸收池兩種。玻璃吸收池用于可見光區(qū)測(cè)定，石英吸收池用于紫外光區(qū)的測(cè)定。吸收池的規(guī)格以光程為標(biāo)志。常用的吸收池規(guī)格有0.5cm、1.0cm、2.0cm、3.0cm、5.0cm等。光柵實(shí)現(xiàn)上就是一系列等寬、等距離的平行狹縫，它是利用光的衍射與干涉作用制成的。光柵作為色散元件具有不少獨(dú)特的優(yōu)點(diǎn)，光柵單色器的分辨率比棱鏡單色器的分辨率高，可精確到0.2nm，而且可用的波長(zhǎng)范圍也比棱鏡單色器的范圍寬。所以，目前生產(chǎn)的紫外可見分光光度計(jì)大多采用光柵作為色散元件。在水質(zhì)的常規(guī)監(jiān)測(cè)中，紫外可見分光光度法占有較大的比重，待測(cè)物的濃度和干擾物的濃度差別很大。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="民用紫外可見分光光度計(jì)報(bào)價(jià),紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592124342670/5540999.png"></div><p style="text-indent:25px">當(dāng)儀器經(jīng)過長(zhǎng)途搬運(yùn)、受過機(jī)械振動(dòng)或更換光源燈泡后，必須進(jìn)行波長(zhǎng)準(zhǔn)確度的檢查與校正。粗檢同上，其校正方法有：干涉濾光片或鐠釹濾光片校正法、利用氘燈的特征發(fā)射線校正法。具體步驟可參考儀器使用說明書。關(guān)于波長(zhǎng)準(zhǔn)確度的檢查與校正日常在使用分光光度計(jì)時(shí)，是否要經(jīng)常進(jìn)行儀器波長(zhǎng)準(zhǔn)確度的檢查?答案是否定的。當(dāng)在日常測(cè)定中發(fā)現(xiàn)儀器測(cè)定靈敏度下降，這時(shí)才應(yīng)進(jìn)行波長(zhǎng)準(zhǔn)確度的檢查，簡(jiǎn)易的檢查方法(粗檢)是：儀器開機(jī)后，調(diào)節(jié)波長(zhǎng)為580nm，在吸收池座的通光道中插入一張白色卡片紙，若能觀察到一長(zhǎng)方形的黃色光斑，說明波長(zhǎng)準(zhǔn)確度屬正常范圍，否則就應(yīng)進(jìn)行波長(zhǎng)校正。傳統(tǒng)單光束UV紫外測(cè)試，測(cè)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(cè)器檢測(cè)。民用紫外可見分光光度計(jì)報(bào)價(jià)</p><p style="text-indent:25px">光學(xué)構(gòu)造和光源、探測(cè)方法、樣品類型和數(shù)據(jù)處理等都是要考慮的因素。民用紫外可見分光光度計(jì)報(bào)價(jià)</p><p> 例： </p> <p> 之后建立了4-氨基安替比林比色法，可實(shí)現(xiàn)對(duì)苯氧乙醇含量20、40、60、80、100ppm的區(qū)分；紫外分光光度法 </p> <p> 期間同時(shí)采用EP中紫外分光光度法，并將其進(jìn)行適當(dāng)改進(jìn)，作為修訂后的企標(biāo)。該方法便利快速，可實(shí)現(xiàn)50ppm以上的定量檢測(cè)。HPLC-DAD </p> <p> 近兩年，桑普對(duì)產(chǎn)品品質(zhì)把控更嚴(yán)格，希望能實(shí)現(xiàn)幾個(gè)ppm的定量檢測(cè)。所以采用了HPLC-DAD作為企標(biāo)對(duì)其檢測(cè)。定性定量。利用特定的吸收峰，快速對(duì)待測(cè)樣品進(jìn)行定性和定量分析。如聚六亞甲基雙胍鹽酸鹽的檢測(cè)。利用雙波長(zhǎng)，以很快的速度辨別是單胍還是雙胍，并進(jìn)行粗略定量。這是液相色譜無論如何也做不到的。 </p> <p> 測(cè)定透過率。透光率是一個(gè)物理詞匯，是表示光線透過介質(zhì)的的能力，是透過透明或半透明物體的光通量與其入射光通量的百分率。吸光度與透過率的換算公式 </p> <p> 透過率對(duì)于某些原料檢測(cè)是非常實(shí)用的，可對(duì)此類原料品質(zhì)進(jìn)行總體把控。 </p> <p> 雜質(zhì)的檢測(cè)。通過前處理將雜質(zhì)與主成分分離后，進(jìn)行紫外分光光度測(cè)定，可很快得到該雜質(zhì)的含量。以桑普實(shí)驗(yàn)室這十幾年對(duì)苯氧乙醇中雜質(zhì)苯酚的測(cè)定方法改進(jìn)過程為民用紫外可見分光光度計(jì)報(bào)價(jià)</p><p style="text-indent:25px">上海儀電分析儀器有限公司致力于儀器儀表，是一家生產(chǎn)型公司。公司業(yè)務(wù)分為分光光度計(jì)，氣相色譜，原子吸收，食品安全等，目前不斷進(jìn)行創(chuàng)新和服務(wù)改進(jìn)，為客戶提供良好的產(chǎn)品和服務(wù)。公司注重以質(zhì)量為中心，以服務(wù)為理念，秉持誠(chéng)信為本的理念，打造儀器儀表良好品牌。儀電分析秉承“客戶為尊、服務(wù)為榮、創(chuàng)意為先、技術(shù)為實(shí)”的經(jīng)營(yíng)理念，全力打造公司的重點(diǎn)競(jìng)爭(zhēng)力。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2812992.html</p></div></div></div></div></div><div id="vyug7pb" 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