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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="i3mgskc" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="x7rtqsz" class="box"><p><p style="text-indent:25px">紫外可見(jiàn)分光光度計(jì)的展望紫外可見(jiàn)分光光度計(jì)雖然是一類(lèi)有著很長(zhǎng)歷史的分析儀器，但每一次吸收了新的技術(shù)成果都使它煥發(fā)出新的活力。掃描光柵型分光光度計(jì)依托成熟的設(shè)計(jì)制造工藝，材料紫外可見(jiàn)分光光度計(jì)排名，并結(jié)合計(jì)算機(jī)控制等新的技術(shù)成果，仍有很強(qiáng)的生命力。在很多方面，掃描型產(chǎn)品仍體現(xiàn)了技術(shù)水平。陣列式探測(cè)器的產(chǎn)生直接促成了固定光柵分光光度計(jì)的設(shè)計(jì)，使得它在測(cè)量地更快、更穩(wěn)定、適應(yīng)性更強(qiáng)的方向邁出了一大步。并且，從今后的發(fā)展來(lái)看，儀器的小型化、在線化，測(cè)量的現(xiàn)場(chǎng)化、實(shí)時(shí)化將是一大方向。要使分光光度計(jì)走出實(shí)驗(yàn)室，成為一種應(yīng)用更廣，更為普及的測(cè)量分析設(shè)備，陣列式探測(cè)器以及其它的固態(tài)式設(shè)計(jì)可發(fā)揮重要的作用。光纖也將是其中的一項(xiàng)重要技術(shù)，它已使得紫外可見(jiàn)分光光度計(jì)的使用變得更方便，同時(shí)也使分光光度計(jì)的配置變得更靈活。光纖結(jié)合模塊化設(shè)計(jì)，可能使得分光光度計(jì)可以突破完全固定、靜態(tài)的組成，而變成可以自由搭配，自助式構(gòu)建的儀器，材料紫外可見(jiàn)分光光度計(jì)排名。光纖同時(shí)也是實(shí)現(xiàn)在線測(cè)量的重要手段。計(jì)算機(jī)技術(shù)的影響將更為增進(jìn)，材料紫外可見(jiàn)分光光度計(jì)排名。分光光度計(jì)的自動(dòng)化、智能化是一個(gè)方面。另一方面，軟件已經(jīng)在一定程度上使實(shí)在的儀器接近了虛擬的程序，網(wǎng)絡(luò)和信息技術(shù)的結(jié)合可能帶來(lái)進(jìn)一步的影響。紫外分光光度計(jì)的光柵是一系列等寬、等距離的平行狹縫，以光的衍射現(xiàn)象和干涉現(xiàn)象為基礎(chǔ)。材料紫外可見(jiàn)分光光度計(jì)排名</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="材料紫外可見(jiàn)分光光度計(jì)排名,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593893024301/8360761.png"></div><p style="text-indent:25px">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(kāi)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(shuō)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。當(dāng)儀器經(jīng)過(guò)長(zhǎng)途搬運(yùn)、受過(guò)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(shuō)明書(shū)。工廠紫外可見(jiàn)分光光度計(jì)差價(jià)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(chēng)為紫外分光光度計(jì)的檢測(cè)器。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="材料紫外可見(jiàn)分光光度計(jì)排名,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png"></div><p> 可見(jiàn)分光光度計(jì)是一種常規(guī)的實(shí)驗(yàn)室分析儀器?？沙Ｓ糜跓o(wú)機(jī)物、有機(jī)物的定性、定量分析中，在科研、制藥、化工、環(huán)保、衛(wèi)生、防疫等領(lǐng)域中發(fā)揮重要的作用。有人說(shuō)，紫外、可見(jiàn)分光光度計(jì)就是一把尺子一個(gè)天平，凡是有化驗(yàn)、分析的地方都能用到它。那么，如何評(píng)價(jià)一臺(tái)紫外、可見(jiàn)分光光度計(jì)的優(yōu)劣呢? </p> <p> 要考察它的外觀。試想，一臺(tái)外型呆板、做工粗糙的儀器，怎么可能是一臺(tái)先進(jìn)的儀器呢? </p> <p> 我們探討一下會(huì)對(duì)儀器的使用有很大影響的幾個(gè)重要指標(biāo) </p> <p> <p> 1、光度準(zhǔn)確度 </p> <p> 2、雜散光 </p> <p> 3、光譜帶寬 </p> <p> 4、穩(wěn)定性 </p> <p> 5、噪聲 </p> <p> 6、波長(zhǎng)的準(zhǔn)確度和重復(fù)性 </p> <p> <br /> </p> </p><p> 使用紫外可見(jiàn)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(wú)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?xún)?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?xún)?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?xún)?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。由于玻璃材質(zhì)會(huì)吸收紫外線，所以目前市面上的紫外可見(jiàn)分光光度計(jì)都采用石英棱鏡。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="材料紫外可見(jiàn)分光光度計(jì)排名,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png"></div><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(wú)論如何也做不到的。 </p> <p> 測(cè)定透過(guò)率。透光率是一個(gè)物理詞匯，是表示光線透過(guò)介質(zhì)的的能力，是透過(guò)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(guò)率的換算公式 </p> <p> 透過(guò)率對(duì)于某些原料檢測(cè)是非常實(shí)用的，可對(duì)此類(lèi)原料品質(zhì)進(jìn)行總體把控。 </p> <p> 雜質(zhì)的檢測(cè)。通過(guò)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(guò)程為分光光度計(jì)的氘燈和汞燈是在不同波長(zhǎng)的時(shí)候有程序控制自動(dòng)變換的，一般是在360nm處變換。雙光束紫外可見(jiàn)分光光度計(jì)選擇</p><p style="text-indent:25px">分光光度法可以得出一些化學(xué)反應(yīng)速度常數(shù)，并從兩個(gè)或兩個(gè)以上溫度條件下得到的速度數(shù)據(jù)，得出反應(yīng)活化能。材料紫外可見(jiàn)分光光度計(jì)排名</p><p style="text-indent:25px">玻璃吸收池用于可見(jiàn)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(jiàn)分光光度計(jì)大多采用光柵作為色散元件。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(chēng)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。材料紫外可見(jiàn)分光光度計(jì)排名</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)?！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)】?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/2153843.html</p></div></div></div></div></div><div id="4wiprtp" 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