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<meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head><body> <h1><a href="http://www.cdcfah.com/">六月丁香婷婷亚洲中文字幕,欧美精品高清一区二区蜜芽,尤物92午夜福利视频,精品视频一区二区三区在线观看</a></h1> <div style="position:fixed;left:-9000px;top:-9000px;"><object id="qgqbi"></object><delect id="qgqbi"><sub id="qgqbi"><dl id="qgqbi"></dl></sub></delect><track id="qgqbi"></track><tr id="qgqbi"></tr><video id="qgqbi"></video><xmp id="qgqbi"><span id="qgqbi"></span></xmp><span id="qgqbi"></span><strong id="qgqbi"><em id="qgqbi"><sup id="qgqbi"><progress id="qgqbi"></progress></sup></em></strong><dl id="qgqbi"><small id="qgqbi"></small></dl><wbr id="qgqbi"></wbr><noscript id="qgqbi"></noscript><tr id="qgqbi"></tr><track id="qgqbi"><dl id="qgqbi"></dl></track><label id="qgqbi"><em id="qgqbi"></em></label><tbody id="qgqbi"></tbody><blockquote id="qgqbi"></blockquote><dfn id="qgqbi"><center id="qgqbi"></center></dfn><sub id="qgqbi"></sub><u 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href="http://www.cdcfah.com/cp/third-gxyq_gpygdj/">光譜儀、光度計</a>?高校紫外可見分光光度計廠家歡迎來電上海儀電分析儀器供應(yīng)</p><div id="cq8cag0" class="leftbox clearfix"><h1>高校紫外可見分光光度計廠家歡迎來電上海儀電分析儀器供應(yīng)</h1><div id="kw8o8ig" class="proBig"><div id="0eqeu8i" 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="guawe0i" 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="uaocsqw" 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>高校紫外可見分光光度計廠家,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-07 02:18:38</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="kigmqgw" 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: </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="s0uk8ck" class="page-proshow02"><p class="title">詳細說明</p><div id="qeckiwm" class="box"><p><p> 紫外-可見分光光度計（UV）引用新型技術(shù)，其功能強大，采用單色器技術(shù)，波長范圍190-1100nm，高校紫外可見分光光度計廠家，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，高校紫外可見分光光度計廠家、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，高校紫外可見分光光度計廠家。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。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。高校紫外可見分光光度計廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="高校紫外可見分光光度計廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><p> 分光光度計的帶寬（bandwidth）很大程度上依賴于單色儀的狹縫的寬度。可以投射出實驗精確要求的光譜。一種嚴格帶寬使得儀器能對復(fù)雜的混合物進行高分辨率的吸光測量。可變的單色儀的狹縫寬度能使一臺分光光度計滿足多種實驗需要。 </p> <p> 為了測量吸光值，分光光度計制造商通常使用光電倍增管（photo-multipliertubes，PMTs）和光敏二極管。PMTs提供快速的反應(yīng)時間和良好的靈敏度，并且可以在紫外光譜調(diào)節(jié)至特定的范圍。但一些制造商依賴于光敏二極管的動態(tài)范圍在數(shù)秒內(nèi)行使所有的光譜測量。甲醇紫外可見分光光度計賣價測量吸光度并不是測量透過吸收池的光強度，而是將光強度轉(zhuǎn)換成電流進行測量，稱為紫外分光光度計的檢測器。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="高校紫外可見分光光度計廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png"></div><p> 使用紫外分光光度計的過程中，經(jīng)常會遇到儀器因光源達不到要求，需要進行調(diào)修。要求光源燈處不能有空氣流動，因為單光束儀器很忌諱空氣快速流動而使光源燈的色溫發(fā)生變化。如遇電壓正常而鎢燈不亮?xí)r，就需要更換鎢燈。更換時，不要用手直接接觸燈泡表面，如果手指摸過，應(yīng)用無水乙醇和C4H10O混合液擦拭干凈，否則通電后指印遇熱不能去除。安裝光源燈后要注意調(diào)整光路。光源燈有兩個引線頭，安裝時用導(dǎo)線焊接，主要是防止接觸不良而造成的光源發(fā)光不穩(wěn)現(xiàn)象。在焊接時防止焊點與燈頭銅皮碰上，裝上燈座使電源短路。燈絲要求平直，如果燈絲彎曲，會影響光能量。燈絲的位置要與入射狹縫平行并對準，上、下、左、右調(diào)節(jié)后緊固螺釘。擰緊燈座的螺紋套，可用鉗子擰緊，一般燈頭盡量往燈座里塞，因為多數(shù)燈絲離燈頭偏高。調(diào)整燈位置的前后可移動整個燈座架，它下面有三個固定螺釘，先稍松后，移動前后位置再固定。一般調(diào)節(jié)鎢燈的位置時，將波長調(diào)到580nm處，狹縫調(diào)到MAX，把一張白紙置于比色皿盒邊出口處，觀察白紙上的光斑。若光斑上方左右角均不完整成半圓弧，可能是光源燈高度不對；光斑左邊或右邊不完整，可調(diào)光源燈底座位置。調(diào)整至白紙上可見明亮、均勻的長方形黃橙色光斑。 </p><p> 當(dāng)以空白試劑為參比調(diào)節(jié)儀器零點時，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，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，且能使校準曲線向橫坐標軸彎曲而偏離朗伯一比爾定律。現(xiàn)在的許多紫外分光光度計裝的是“長壽”型燈源，據(jù)說氘燈可達2000小時，鎢燈3000小時。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="高校紫外可見分光光度計廠家,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593139440396/4585287.png"></div><p> 可見分光光度計是一種常規(guī)的實驗室分析儀器?？沙Ｓ糜跓o機物、有機物的定性、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，紫外、可見分光光度計就是一把尺子一個天平，凡是有化驗、分析的地方都能用到它。那么，如何評價一臺紫外、可見分光光度計的優(yōu)劣呢? </p> <p> 要考察它的外觀。試想，一臺外型呆板、做工粗糙的儀器，怎么可能是一臺先進的儀器呢? </p> <p> 我們探討一下會對儀器的使用有很大影響的幾個重要指標 </p> <p> <p> 1、光度準確度 </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、波長的準確度和重復(fù)性 </p> <p> <br /> </p> 紫外可見分光光度計應(yīng)安裝在太陽不能直接曬到的地方，以免“室光” 太強，影響儀器的使用壽命。中國**紫外可見分光光度計設(shè)備</p><p style="text-indent:25px">實驗室研究人員希望省錢購入專門儀器定量核酸、蛋白或者細菌的生長情況。高校紫外可見分光光度計廠家</p><p> 我們都知道，紫外-可見分光光度計是實驗室中出鏡率相當(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-可見分光光度計的哪些性能？ </p> <p> 大家都來說說吧！分光光度法是通過測定被測物質(zhì)，在特定波長處或一定波長范圍內(nèi)光的吸光度或發(fā)光強度，對該物質(zhì)進行定性和定量分析的方法。紫外-可見分光光度計是元析儀器引用新型技術(shù)，其功能強大，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)用范圍包括化工分析以及市政和工業(yè)廢水，飲用水，加工過程用水，地表水，冷卻水和鍋爐補給水等液體的分析。高校紫外可見分光光度計廠家</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，計算機軟件開發(fā)及銷售，從事貨物進出口及技術(shù)進出口業(yè)務(wù)。【依法須經(jīng)批準的項目，經(jīng)相關(guān)部門批準后方可開展經(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，計算機軟件開發(fā)及銷售，從事貨物進出口及技術(shù)進出口業(yè)務(wù)。【依法須經(jīng)批準的項目，經(jīng)相關(guān)部門批準后方可開展經(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)。公司自創(chuàng)立以來，投身于分光光度計，氣相色譜，原子吸收，食品安全，是儀器儀表的主力軍。儀電分析始終以本分踏實的精神和必勝的信念，影響并帶動團隊取得成功。儀電分析始終關(guān)注儀器儀表行業(yè)。滿足市場需求，提高產(chǎn)品價值，是我們前行的力量。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1879929.html</p></div></div></div></div></div><div id="uayo2oe" class="page-right twoColRt"><div id="ayoca0q" class="box01 margin10 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