生產(chǎn)紫外可見分光光度計銷售廠家真誠推薦上海儀電分析儀器供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="紫外可見分光光度計是一類很重要的實(shí)驗(yàn)室分析儀器，無論在物理學(xué)、化學(xué)、生物學(xué)、醫(yī)學(xué)、材料學(xué)、環(huán)境科學(xué)等科學(xué)研究領(lǐng)域，還是在化工、醫(yī)藥、環(huán)境檢測、冶金等現(xiàn)代化生產(chǎn)與管理部門，紫外可見分光光度計都有面向廣的應(yīng)用，生產(chǎn)紫外可見分光光度計銷售廠家。紫"><meta name="keywords" content="生產(chǎn)紫外可見分光光度計銷售廠家,紫外可見分光光度計"><link rel="canonical" href="http://www.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> <meta name="baidu-site-verification" 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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>生產(chǎn)紫外可見分光光度計銷售廠家,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-04 00:30:25</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="i22bykm" 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="pogip8c" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="foqip8h" class="box"><p><p> 紫外可見分光光度計是一類很重要的實(shí)驗(yàn)室分析儀器，無論在物理學(xué)、化學(xué)、生物學(xué)、醫(yī)學(xué)、材料學(xué)、環(huán)境科學(xué)等科學(xué)研究領(lǐng)域，還是在化工、醫(yī)藥、環(huán)境檢測、冶金等現(xiàn)代化生產(chǎn)與管理部門，紫外可見分光光度計都有面向廣的應(yīng)用，生產(chǎn)紫外可見分光光度計銷售廠家。 </p> <p> 紫外可見分光光度計校正 </p> <p> 開機(jī)預(yù)熱10分鐘足矣； </p> <p> 放入黑塊和標(biāo)樣（沒有的自己配），生產(chǎn)紫外可見分光光度計銷售廠家，生產(chǎn)紫外可見分光光度計銷售廠家，關(guān)閉蓋子； </p> <p> 校0； </p> <p> 把燈光對著黑塊，把透光度調(diào)0； </p> <p> 把燈光對標(biāo)樣，將吸光度調(diào)到100%。 </p> <p> 紫外可見分光光度計使用注意事項(xiàng) </p> <p> 開機(jī)前應(yīng)先預(yù)熱15分鐘，然后開機(jī)自檢； </p> <p> 濕度要控制在75%左右，溫度在5～30度之間； </p> <p> 儀器要穩(wěn)壓電源，接地要好。并且避免陽光直接照射。紫外分光光度計可用于藥品的鑒別、純度檢查及含量測定，既可以定性分析，又可以定量分析。生產(chǎn)紫外可見分光光度計銷售廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="生產(chǎn)紫外可見分光光度計銷售廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593771266494/7369055.png"></div><p> 色譜技術(shù)比它起步晚了二百多年，但如今的色譜儀器（氣相、液相、氣質(zhì)、液質(zhì)）占了分析界的大半壁江山。相較璀璨如星的各類的色譜儀器，紫外-可見分光光度計黯然了很多。 </p> <p> 紫外-可見分光光度計可以被更精確更高級的檢測手段所取代？可以退出“分析史”的舞臺？ </p> <p> NO！NO！NO！ </p> <p> 事實(shí)上紫外-可見分光光度計（下文簡稱紫外分光光度計），依然是“分析舞臺”的美玉，低調(diào)有內(nèi)涵，親民有價值。一起來發(fā)現(xiàn)它在日化產(chǎn)品分析中的美和價值吧。原理分子的紫外可見吸收光譜是由于分子中的某些基團(tuán)吸收了紫外可見輻射光后，發(fā)生了電子能級躍遷而產(chǎn)生的吸收光譜。由于各種物質(zhì)具有各自不同的分子、原子和分子空間結(jié)構(gòu)，其吸收光能量的情況也就不會相同，因此，每種物質(zhì)都有其特有的、固定的吸收光譜曲線，可根據(jù)吸收光譜上某些特征波長處吸光度的高低判別或測定該物質(zhì)的含量，這就是分光光度定性和定量分析的基礎(chǔ)。 **紫外可見分光光度計差價紫外-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="生產(chǎn)紫外可見分光光度計銷售廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png"></div><p> 紫外-可見分光光度計（UV）引用新型技術(shù)，其功能強(qiáng)大，采用單色器技術(shù)，波長范圍190-1100nm，是各種涉及水和廢水分析領(lǐng)域的通用儀器，應(yīng)用范圍包括市政和工業(yè)廢水，飲用水，加工過程用水，地表水，冷卻水和鍋爐補(bǔ)給水等。 </p> <p> 在水和廢水監(jiān)測中的應(yīng)用，對于一個水系的監(jiān)測分析和綜合評價，一般包括水相（溶液本身）、固相（懸浮物、底質(zhì)）、生物相（水生生物）。在水質(zhì)的常規(guī)監(jiān)測中，紫外可見分光光度法占有較大的比重。由于水和廢水的成分復(fù)雜多變，待測物的濃度和干擾物的濃度差別很大，在具體分析時必須選擇好分析方法。 </p> <p> 在農(nóng)產(chǎn)品和食品分析中可用于檢測的組分或成分有蛋白質(zhì)、賴氨酸、葡萄糖、維生素C、硝酸鹽、亞硝酸鹽、砷、汞等; </p> <p> 在植物生化分析中可用于檢測葉綠素、全氮和酶的活力等； </p> <p> 在飼料分析中可用于檢測煙酸、棉酚、磷化氫和甲酯等。原理紫外可見吸收光譜主要產(chǎn)生于分子價電子在能級間的躍遷。利用一定頻率的紫外--可見光照射被分析的物質(zhì)，引起分子中價電子的躍遷，它將有選擇地被吸收。吸收光譜可以反映出物質(zhì)的特征。它對物質(zhì)進(jìn)行定性分析、定量分析及結(jié)構(gòu)分析,所依據(jù)的光譜是分子或離子吸收入射光中特定波長的光而產(chǎn)生的吸收光譜。 </p><p> 當(dāng)以空白試劑為參比調(diào)節(jié)儀器零點(diǎn)時，比色皿窗材料的吸收、內(nèi)外窗面的散射以及溶劑的吸收等都被抵消，所得吸光度值完全由顯色溶液中待測離了濃度所決定。此時吸光度值與試液濃度一般呈線性關(guān)系。吸光度值與測定濃度不成直線關(guān)系，發(fā)生向下彎曲(負(fù)偏離)或向上彎曲(正偏離)的現(xiàn)象而偏離朗伯一比爾定律的主要原因如下。 </p> <p> <br /> </p> <p> (1)非單色光的影響：紫外一可見分光光度訃使用連續(xù)光源和分光器分光，不可能得到真正理想的單色光；為保證在測量中能得到充分的光強(qiáng)，儀器必須保持一定的狹縫寬度。由狹縫射出后投射到被測物質(zhì)上的光，是一個有限寬度的譜帶——光譜通帶。隨光譜通帶寬度的增大，吸收光譜的分辨率降低，并偏離朗伯一比爾定律。 </p> <p> (2)非吸收光的影響：當(dāng)來自出射狹縫的光的光譜通帶寬度大于吸收光譜譜帶時，投射在被測物質(zhì)上的光就含有非吸收光。這不僅能使靈敏度降低，且能使校準(zhǔn)曲線向橫坐標(biāo)軸彎曲而偏離朗伯一比爾定律。金屬離子常與有機(jī)物形成絡(luò)合物，多數(shù)絡(luò)合物在紫外可見區(qū)是有吸收的，我們可以利用分光光度法來研究其組成。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="生產(chǎn)紫外可見分光光度計銷售廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png"></div><p> 紫外可見分光光度計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> 2選擇比色皿洗滌液的原則是去污效果好，不損壞比色皿，同時又不影響測定。 </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> 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，再于過氧化氫和硝酸(5：1)混合溶液中侵泡半小時。實(shí)驗(yàn)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。石油紫外可見分光光度計比較</p><p style="text-indent:25px">紫外可見吸收光譜是由于分子中的某些基團(tuán)吸收了紫外可見輻射光后，發(fā)生了電子能級躍遷而產(chǎn)生的吸收光譜。生產(chǎn)紫外可見分光光度計銷售廠家</p><p> 掌握紫外可見光分光光度計基本工作原理：一定頻率紫外可見光照射所需要分析的目標(biāo)樣品，引起目標(biāo)樣品中價電子發(fā)生躍遷，從而變現(xiàn)隨著吸收波長變化而引起光譜變化，形成可供分析數(shù)據(jù)。 </p> <p> 以朗伯-比耳定律(Lambert-beer)為理論基礎(chǔ)，特定波長吸收中，吸收程度正比于試樣成分濃度，因此，可進(jìn)行光譜的定性分析。且根據(jù)吸收與已知濃度標(biāo)樣比較，能進(jìn)行定量分析。 </p> <p> 紫外可見光分光光度計種類及優(yōu)缺點(diǎn)對比：傳統(tǒng)機(jī)型：單光束UV、全程密閉、以光柵進(jìn)行分光，標(biāo)樣和測試樣品分別測試，全波段掃描時間至多2min；比例雙光束UV：單光束UV，全程密閉、經(jīng)光柵再經(jīng)棱鏡，全程密閉、標(biāo)樣和測試樣品分別測試、測試靈敏度降低，全波段分析時間長。生產(chǎn)紫外可見分光光度計銷售廠家</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)型的公司。公司業(yè)務(wù)分為分光光度計，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，秉持誠信為本的理念，打造儀器儀表良好品牌。儀電分析立足于全國市場，依托強(qiáng)大的研發(fā)實(shí)力，融合前沿的技術(shù)理念，飛快響應(yīng)客戶的變化需求。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1834093.html</p></div></div></div></div></div><div id="bvn3iog" class="page-right twoColRt"><div id="tnkelsz" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="oikmo8g" 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" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)</p></a></div><div id="tifhj2g" class="recomPic likePro"><a 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