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id="dzx7ebd" 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>分析檢測(cè)紫外可見(jiàn)分光光度計(jì)性?xún)r(jià)比,紫外可見(jiàn)分光光度計(jì)</p><p><span>***更新：</span>2020-11-09 06:22:41</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="ni6x6og" 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="atdbfat" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="eu2ntd8" class="box"><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，分析檢測(cè)紫外可見(jiàn)分光光度計(jì)性?xún)r(jià)比，飲用水，加工過(guò)程用水，地表水，分析檢測(cè)紫外可見(jiàn)分光光度計(jì)性?xún)r(jià)比，分析檢測(cè)紫外可見(jiàn)分光光度計(jì)性?xún)r(jià)比，冷卻水和鍋爐補(bǔ)給水等液體的分析。在操作紫外可見(jiàn)分光光度計(jì)時(shí)，操作人員需要留意一下機(jī)器的干燥劑。分析檢測(cè)紫外可見(jiàn)分光光度計(jì)性?xún)r(jià)比</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="分析檢測(cè)紫外可見(jiàn)分光光度計(jì)性?xún)r(jià)比,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><p> 紫外可見(jiàn)分光光度計(jì)條件設(shè)定 </p> <p> 在定量分析中，為了提高測(cè)定的靈敏度，入射光的波長(zhǎng)應(yīng)選擇被測(cè)物的MAX吸收波長(zhǎng)λmax，如果λmax有干擾，可選擇另一條靈敏度稍低、但能避免干擾的譜線，所以，適當(dāng)選擇入射光的波長(zhǎng)，不僅能提高測(cè)定的靈敏度，還能提高測(cè)定的準(zhǔn)確度。 </p> <p> 狹縫寬度過(guò)大，入射光的單色性差；狹縫寬度太小，入射光的強(qiáng)減弱。狹縫寬度過(guò)大或過(guò)小均會(huì)造成靈敏度降低，選擇是產(chǎn)生MIN誤差情下的MAX狹縫。一般選用儀器的狹縫寬琶度應(yīng)小于待測(cè)樣品吸收帶的半寬度，否則測(cè)得的吸光度值會(huì)偏低，狹縫寬度的選擇應(yīng)以減少狹縫寬度時(shí)供試品的吸光度不再；加為準(zhǔn)，對(duì)于大部分被測(cè)品種，可以使用2nm縫寬。 </p> <p> 可通過(guò)控制被測(cè)物濃度或改變吸收池厚度來(lái)實(shí)現(xiàn)吸光度合理的范圍，以盡量減小測(cè)量誤差。一般吸光度盡量控制在0.1-0.8范圍。 </p> <p> 空白溶液是用來(lái)調(diào)節(jié)吸光度測(cè)量工作零點(diǎn)即A=0，T=100%的溶液，以消除溶液中其它基體組分以及吸收池和溶劑對(duì)入射光的反射和吸收所帶來(lái)的誤差。根據(jù)情況不同，常用空白溶液有如下幾種選擇。 </p> <p> <br /> **紫外可見(jiàn)分光光度計(jì)廠家供應(yīng)實(shí)驗(yàn)室研究人員希望省錢(qián)購(gòu)入專(zhuān)門(mén)儀器定量核酸、蛋白或者細(xì)菌的生長(zhǎng)情況。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="分析檢測(cè)紫外可見(jiàn)分光光度計(jì)性?xún)r(jià)比,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593980700101/5381945.png"></div>紫外可見(jiàn)分光光度計(jì)使用中常見(jiàn)問(wèn)題解析 <p> 在一般分光光度計(jì)的使用說(shuō)明書(shū)上，要求儀器預(yù)熱時(shí)間約20分鐘；若是帶微處理器的分光光度計(jì)，開(kāi)機(jī)后儀器自動(dòng)進(jìn)入自檢(初始化)狀態(tài)，約需1O分鐘左右。在分光光度計(jì)預(yù)熱這個(gè)環(huán)節(jié)上，很多使用者或多或少存在問(wèn)題，如開(kāi)機(jī)只預(yù)熱電路系統(tǒng)(不調(diào)節(jié)波長(zhǎng)、打開(kāi)吸收池暗箱蓋預(yù)熱等)或認(rèn)為初始化過(guò)程就是預(yù)熱等等。對(duì)帶微處理器有自檢功能的分光光度計(jì)，開(kāi)機(jī)后儀器自檢(初始化)結(jié)束后，在測(cè)定窗口上，設(shè)置所需波長(zhǎng)值，用一個(gè)吸收池裝上純凈水置于光路上，調(diào)“0000A”后，預(yù)熱儀器，當(dāng)儀器顯示讀數(shù)不再變化后即可進(jìn)行測(cè)定。 </p> <p> 對(duì)于紫外可見(jiàn)分光光度計(jì)，由于有雙光源(鎢燈與氘燈)，為了延長(zhǎng)燈的使用壽命，開(kāi)機(jī)自檢完成后可以關(guān)掉測(cè)定時(shí)不用的光源燈。 </p><p style="text-indent:25px">使用紫外可見(jiàn)分光光度計(jì)進(jìn)行定量和定性分析需注意以下一些問(wèn)題：1吸光度讀數(shù)范圍：吸光度測(cè)量誤差在透過(guò)率過(guò)大或過(guò)小時(shí)都會(huì)變大，為了滿(mǎn)足定量分析的誤差要求（<5%），在定量分析時(shí)要求吸光度應(yīng)在一定的范圍內(nèi)，這個(gè)范圍的具體值與儀器性能有關(guān)，主要是與紫外可見(jiàn)分光光度計(jì)檢測(cè)系統(tǒng)噪聲大小有關(guān)，但通常都在0.1~1.0范圍內(nèi)，如果儀器的檔次更低，則范圍更窄。根據(jù)朗伯比爾定律，影響吸光度大小的因素主要是樣品摩爾吸光系數(shù)，濃度和比色皿光程。實(shí)驗(yàn)中吸光度過(guò)大的樣品可通過(guò)稀釋樣品使吸光度到所需范圍內(nèi)。如果樣品不能稀釋?zhuān)梢愿挠霉獬梯^小的比色皿減小吸光度。吸光度過(guò)小的樣品可使用光程較大的比色皿以增大吸光度。傳統(tǒng)單光束UV紫外測(cè)試，測(cè)試過(guò)程全程封閉，單光束光源只通過(guò)光柵直接照射樣品，再經(jīng)光電倍增管檢測(cè)器檢測(cè)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="分析檢測(cè)紫外可見(jiàn)分光光度計(jì)性?xún)r(jià)比,紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png"></div><p> 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)。大部分單機(jī)型的分光光度計(jì)包含了驅(qū)動(dòng)儀器運(yùn)行和管理數(shù)據(jù)的軟件。與PC機(jī)一起聯(lián)用，需要從制造商購(gòu)買(mǎi)軟件。飼料紫外可見(jiàn)分光光度計(jì)對(duì)比</p><p style="text-indent:25px">紫外分光光度計(jì)的帶寬（bandwidth）很大程度上依賴(lài)于單色儀的狹縫的寬度。分析檢測(cè)紫外可見(jiàn)分光光度計(jì)性?xún)r(jià)比</p><p> 紫外可見(jiàn)分光光度計(jì)的比色皿的洗滌方法 </p> <p> 1分光光度法中比色皿潔凈與否是影響測(cè)定準(zhǔn)確度的因素之一。因此，必須重視選擇正確的洗凈方法。 </p> <p> 俺的經(jīng)驗(yàn)是：要是你測(cè)定溶液是酸，如果不干凈，就用弱堿溶液洗，要是你測(cè)定溶液是堿，如果不干凈，就用弱酸溶液洗，要是你測(cè)定溶液是有機(jī)物質(zhì)，如果不干凈，就用有機(jī)溶劑，比如酒精等溶液洗。 </p> <p> 2選擇比色皿洗滌液的原則是去污效果好，不損壞比色皿，同時(shí)又不影響測(cè)定。 </p> <p> 2.1分析常用的鉻酸洗液不宜用于洗滌比色皿，這是因?yàn)閹谋壬笤谠撓匆褐杏袝r(shí)會(huì)局部發(fā)熱，致使比色皿膠接面裂開(kāi)而損壞。同時(shí)經(jīng)洗液洗滌后的比色皿還很可能殘存微量鉻，其在紫外區(qū)有吸收，因此會(huì)影響鉻及其他有關(guān)元素的測(cè)定。 </p> <p> 一般主張使用硝酸和過(guò)氧化氫(5：1)的混合溶液泡洗，然后用水沖洗干凈。對(duì)一般方法難以洗凈的比色皿，還可以采取以下兩種方法。 </p> <p> 2.2先將比色皿侵入含有少量陰離子表面活性劑的碳酸鈉(20克/升)溶液泡洗，經(jīng)水沖洗后，再于過(guò)氧化氫和硝酸(5：1)混合溶液中侵泡半小時(shí)。分析檢測(cè)紫外可見(jiàn)分光光度計(jì)性?xún)r(jià)比</p><p style="text-indent:25px">上海儀電分析儀器有限公司是一家生產(chǎn)型類(lèi)企業(yè)，積極探索行業(yè)發(fā)展，努力實(shí)現(xiàn)產(chǎn)品創(chuàng)新。公司是一家有限責(zé)任公司企業(yè)，以誠(chéng)信務(wù)實(shí)的創(chuàng)業(yè)精神、專(zhuān)業(yè)的管理團(tuán)隊(duì)、踏實(shí)的職工隊(duì)伍，努力為廣大用戶(hù)提供高品質(zhì)的產(chǎn)品。公司業(yè)務(wù)涵蓋分光光度計(jì)，氣相色譜，原子吸收，食品安全，價(jià)格合理，品質(zhì)有保證，深受廣大客戶(hù)的歡迎。儀電分析以創(chuàng)造高品質(zhì)產(chǎn)品及服務(wù)的理念，打造高指標(biāo)的服務(wù)，引導(dǎo)行業(yè)的發(fā)展。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/1913611.html</p></div></div></div></div></div><div id="8qjhwb7" class="page-right twoColRt"><div id="9oc4ec0" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="zeex4jm" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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