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class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="xlt3rhp" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="t7x3bhd" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</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>雙光束紫外可見分光光度計報價,紫外可見分光光度計</p><p><span>***更新：</span>2020-12-22 04:13:57</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="t5hv3dz" 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="3hb5vlj" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="3zxbpjd" class="box"><p><p> 紫外可見光分光光度計的體積大小以及外觀美學(xué)性。紫外可見分光光度計的儀器體積大小，會牽扯儀器所需要的擺放位置以及儀器使用的方便程度。 </p> <p> 儀器的外形美觀，給人以大氣、上檔次、舒適，雙光束紫外可見分光光度計報價、新鮮的感覺。首先，會讓使用儀器者對儀器分外的愛護(hù)、維護(hù)和保養(yǎng)，有利于延長儀器的使用壽命，雙光束紫外可見分光光度計報價。同時，也會讓儀器使用者的工作環(huán)境更舒適、優(yōu)美，也有利于提高工作效率。 </p> <p> 紫外可見光分光光度計儀器使用范圍。紫外可見光分光光度的使用范圍是有儀器的性能指標(biāo)所決定。采購紫外可見光分光光度計根據(jù)測試樣品的具體要求，參考儀器的使用范圍，雙光束紫外可見分光光度計報價，滿足即可，不必苛求。當(dāng)然，土豪可以忽略。 </p> 雙光束UV：經(jīng)棱鏡分光后通過光柵，加強了靈敏度，同時測量空白樣品與目標(biāo)樣品的優(yōu)點，全波段分析時間長。全波段UV：樣品與空白樣品可以暴露在空氣中，照射樣品后，進(jìn)入密閉箱，通過光柵，進(jìn)入DAD檢測器檢測。檢測樣品不需要密閉，外界光線對測試無影響，使用方便準(zhǔn)確且空白只需要檢測一次，全波段分析時間小于1s。 <p> <br /> 分光光度分析就是根據(jù)物質(zhì)的吸收光譜研究物質(zhì)的成分、結(jié)構(gòu)和物質(zhì)間相互作用的有效手段。雙光束紫外可見分光光度計報價</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="雙光束紫外可見分光光度計報價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png"></div><p style="text-indent:25px">使用紫外可見分光光度計進(jìn)行定量和定性分析需注意以下一些問題：1吸光度讀數(shù)范圍：吸光度測量誤差在透過率過大或過小時都會變大，為了滿足定量分析的誤差要求（<5%），在定量分析時要求吸光度應(yīng)在一定的范圍內(nèi)，這個范圍的具體值與儀器性能有關(guān)，主要是與紫外可見分光光度計檢測系統(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。實驗中吸光度過大的樣品可通過稀釋樣品使吸光度到所需范圍內(nèi)。如果樣品不能稀釋，可以改用光程較小的比色皿減小吸光度。吸光度過小的樣品可使用光程較大的比色皿以增大吸光度。元素紫外可見分光光度計賣價紫外分光光度計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)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="雙光束紫外可見分光光度計報價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593893024301/8360761.png"></div><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使用，即在紫外區(qū)采用氘燈，而在可見區(qū)使用鎢燈，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)約等待時間又能節(jié)省維修費用，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> 一般簡易型分光光度計的光源室僅僅設(shè)計了一支鎢燈來涵蓋整個波長區(qū)域的使用，由于鎢燈的能量在紫外區(qū)很弱，因此、此類儀器在紫外區(qū)的測量信號的噪聲較大。 </p> <p> 也有專用的紫外分光光度計，同理、光源燈就改用一支氘燈了。 </p><p> 選擇比色皿洗滌液的原則是去污效果好，不損壞比色皿，同時又不影響測定。 </p> <p> 分析常用的鉻酸洗液不宜用于洗滌比色皿，這是因為帶水的比色皿在該洗液中有時會局部發(fā)熱，致使比色皿膠接面裂開而損壞。同時經(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，因此會影響鉻及其他有關(guān)元素的測定。 </p> <p> 一般主張使用硝酸和過氧化氫(5：1)的混合溶液泡洗，然后用水沖洗干凈。對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> 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，再于過氧化氫和硝酸(5：1)混合溶液中侵泡半小時。 </p> <p> 紫外可見分光光度計的比色皿的洗滌方法 </p> <p> 分光光度法中比色皿潔凈與否是影響測定準(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)驗是：要是你定溶液是酸，如果不干凈，就用弱堿溶液洗，要是你測定溶液是堿，如果不干凈，就用弱酸溶液洗，要是你測定溶液是有機(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> <br /> 紫外-可見分光光度法是利用某些物質(zhì)的分子吸收200--800nm光譜區(qū)的輻射來進(jìn)行分析測定的方法。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="雙光束紫外可見分光光度計報價,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593139440396/4585287.png"></div><p> 在分光元器件方面，經(jīng)歷了棱鏡、機(jī)刻光柵和全息光柵的過程，商品化的全息閃耀光柵已迅速取代一般刻劃光柵。在儀器控制方面，隨著單片機(jī)、微處理器的出現(xiàn)以及軟硬件技術(shù)的結(jié)合，從早期的人工控制進(jìn)步到了自動控制。在顯示、記錄與繪圖方面，早期采用表頭(電位計)指示、繪圖儀繪圖，后來用數(shù)字電壓表數(shù)字顯示，如今更多地采用液晶屏幕或計算機(jī)屏幕顯示。在檢測器方面，早期使用光電池、光電管，后來更普遍地使用光電倍增管甚至光電二極管陣列。陣列型檢測器和凹面光柵的聯(lián)合應(yīng)用，使儀器的測量速度發(fā)生了質(zhì)的飛躍，且性能更加穩(wěn)定可靠，受到儀器用戶的青睞，在儀器構(gòu)型方面，從單光束發(fā)展為雙光束，現(xiàn)在幾乎所有高級分光光度計都是雙光束的，有些高精度的儀器采用雙單色器。紫外可見分光光度計的發(fā)展分光光度法在分析領(lǐng)域中的應(yīng)用已經(jīng)有數(shù)十年的歷史，至今仍是應(yīng)用常用的分析方法之一。隨著分光元器件及分光技術(shù)、檢測器件與檢測技術(shù)、大規(guī)模集成制造技術(shù)等的發(fā)展，以及單片機(jī)、微處理器、計算機(jī)和DSP技術(shù)的應(yīng)用，分光光度計的性能指標(biāo)不斷提高，并向自動化、智能化、高速化和小型化等方向發(fā)展。實驗室研究人員希望省錢購入專門儀器定量核酸、蛋白或者細(xì)菌的生長情況。材料紫外可見分光光度計</p><p style="text-indent:25px">紫外可見分光光度計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)。雙光束紫外可見分光光度計報價</p><p> 在使用紫外可見分光光度計時候，設(shè)備儀器使用之前，一定需要能夠把樣品室內(nèi)存放的防潮劑給拿出來，且在設(shè)備正常運轉(zhuǎn)檢查時候也不能開啟樣品室蓋；在檢查時候需注意比色皿當(dāng)中的液體要能占總體積的百分之六十六到百分之八十比較好，千萬不能讓液體太多以至于液體外泄直接腐蝕儀器設(shè)備。 </p> <p> 當(dāng)然在進(jìn)行正常檢測時候，也要能確保比色皿干凈，當(dāng)發(fā)現(xiàn)內(nèi)壁上有液滴就許使用專業(yè)的紙張給擦拭干凈，建議大家千萬不要使用手直接擦拭，以免造成對手的傷害。 </p> <p> 在使用紫外可見分光光度計時，儀器設(shè)備在正常運轉(zhuǎn)的時候，一定要嚴(yán)禁把液體溶劑給直接放置于儀器的表層上，如果發(fā)現(xiàn)有溶劑液體出現(xiàn)外泄的情況，一定要進(jìn)行及時的清潔和處理。 </p> <p> 當(dāng)使用紫外可見分光光度計檢測完畢后，還需要能夠及時把比色皿內(nèi)的液體給妥善處理掉，并還需要能夠使用蒸餾水給徹底清潔干凈，同時將比色皿進(jìn)行倒置晾干處理；全部工作完成后還需把設(shè)備儀器電源給關(guān)閉，再將防潮劑放入到樣品室內(nèi)并做好防塵處理才好。雙光束紫外可見分光光度計報價</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)及銷售，計算機(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)的項目，經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營活動】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)的項目，經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營活動】的公司，致力于發(fā)展為創(chuàng)新務(wù)實、誠實可信的企業(yè)。儀電分析深耕行業(yè)多年，始終以客戶的需求為向?qū)?，為客戶提供高品質(zhì)的分光光度計，氣相色譜，原子吸收，食品安全。儀電分析不斷開拓創(chuàng)新，追求出色，以技術(shù)為先導(dǎo)，以產(chǎn)品為平臺，以應(yīng)用為重點，以服務(wù)為保證，不斷為客戶創(chuàng)造更高價值，提供更優(yōu)服務(wù)。儀電分析始終關(guān)注自身，在風(fēng)云變化的時代，對自身的建設(shè)毫不懈怠，高度的專注與執(zhí)著使儀電分析在行業(yè)的從容而自信。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2507530.html</p></div></div></div></div></div><div id="3ft57z5" class="page-right twoColRt"><div id="9xdz3rf" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="tzf5lxt" class="recomPic likePro"><a 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