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clearfix"><section class="container clearfix tcPro"><section class="home-main container clearfix"><div id="cwtpwof" class="twoCol"><div id="lumtvx3" class="page-proshow clearfix"><p class="current"> 當前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應</a>?<a href="http://www.cdcfah.com/cp/first-_yiqiyibiao/">儀器儀表</a>?<a href="http://www.cdcfah.com/cp/second-yiqiyibiao_fenxiyiqi/">分析儀器</a>?<a href="http://www.cdcfah.com/cp/third-fenxiyiqi_ysfxyq/">元素分析儀器</a>?實驗室原子吸收分光光度計單價客戶至上上海儀電分析儀器供應</p><div id="hvcewdf" class="leftbox clearfix"><h1>實驗室原子吸收分光光度計單價客戶至上上海儀電分析儀器供應</h1><div id="vzwtahj" class="proBig"><div id="hliurtv" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988188495975/1516361.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="azgdpbt" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988188495975/1516361.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="eoq3c2h" 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>實驗室原子吸收分光光度計單價,原子吸收分光光度計</p><p><span>***更新：</span>2021-02-06 06:11:07</p><p><span id="click" >瀏覽次數(shù)：4次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="7n8cnzr" 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="jyvszgs" class="page-proshow02"><p class="title">詳細說明</p><div id="3lvhj3a" class="box"><p><p style="text-indent:25px">原子吸收分光光度計基線漂移測試注意事項：①我國的原子吸收分光光度計計量檢定規(guī)程規(guī)定：測試基線漂移時銅燈預熱3min，這是不妥的，實驗室原子吸收分光光度計單價。因為從理論上講，銅燈一般在30min左右才能達到穩(wěn)定狀態(tài)，所以操作時應該預熱30min。②雙光束和單光束的測試結(jié)果不應該相同，因為從理論上講，雙光束測試指標應稍優(yōu)于單光束儀器，否則雙光束儀器沒有意義。③計量檢定規(guī)程規(guī)定測試基線漂移的時間為30min，這也是欠妥當?shù)?。目前，國際上的做法是連續(xù)測試一小時。然而，有些制造廠商采用測試lOmin或測試30min等，來作為基線漂移的測試時間，實驗室原子吸收分光光度計單價，這是不科學的，實驗室原子吸收分光光度計單價。因為，如果使用者做一個實驗，在lOmin內(nèi)還未做完，儀器的基線就已經(jīng)漂掉了，這怎么能保證分析測試數(shù)據(jù)的可靠性呢?30min的測試時間也不科學，因為空心陰極燈是一種氣體放電燈，從物理學或從氣體發(fā)光的理論來講，一般的氣體放電燈其發(fā)光要在30min左右才能達到穩(wěn)定。特別是1Omin時間，燈泡的發(fā)光也未達到較佳值，何況還有其他比較多因素決定了儀器還未達到測試穩(wěn)定的狀態(tài)。所以，測試穩(wěn)定性應該保證一小時才能得出正確的結(jié)果。原子吸收觀察的是構(gòu)成物質(zhì)的元素（原子）中的電子在原子軌道中的躍遷，屬于原子吸收。實驗室原子吸收分光光度計單價</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="實驗室原子吸收分光光度計單價,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988188495975/1516361.png"></div><p style="text-indent:25px">原子吸收分光光度計的安全運用留意事項：1、乙炔氣源鄰近禁止明火或過熱高溫物體寄存，乙炔氣源不應與氧化性氣源同放。2、排放的廢液應及時傾倒處理或與當?shù)丨h(huán)保部門。3、禁止帶電插拔數(shù)據(jù)線纜。4、在日常作業(yè)中應經(jīng)常檢查乙炔鋼瓶與減壓閥連接是否結(jié)實無漏氣。5、留意燃燒、關(guān)火次序。燃燒后操作人員不得離開！在當天不必儀器操作時,請將乙炔管道里的剩下氣體燃燒完，即直接關(guān)乙炔總開關(guān)再管空氣。6、帶石墨爐的儀器必定要留意用電安全,因為會運用380V動力電，加熱時瞬間會發(fā)生比較大的電流,所以在石墨爐處于作業(yè)狀況時，不要直接觸碰爐體部分，避免造成風險.在做試驗時隨時調(diào)查氬氣的總壓力和內(nèi)氣流量計的流量,以確保石墨管可以長期運用和試驗的準確和一致性。甲醇原子吸收分光光度計廠家供應子吸收分光光度計使用的標準溶液在4℃溫度下可保存較長時間，放置室溫后可正常使用。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="實驗室原子吸收分光光度計單價,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419991385859509/5179129.png"></div><p style="text-indent:25px">原子吸收分光光度計，有火焰原子吸收分光光度計和帶石墨爐的原子吸收分光光度計兩種。前者原子化的溫度在2100℃～2400℃之間，后者在2900℃～3000℃之間?；鹧嬖游辗止夤舛扔?，利用空氣—乙炔測定的元素可達30多種，若使用笑氣—乙炔火焰，測定的元素可達70多種。但笑氣—乙炔火焰安全性較差，客戶應用不普遍，基本上實驗室都取締了?？諝狻胰不鹧嬖游辗止夤舛确?，一般可檢測到PPm級（10-6），精密度1%左右。國產(chǎn)的火焰原子吸收分光光度計，AA-1800C，都可配備各種型號的氫化物發(fā)生器（屬電加熱原子化器），利用氫化物發(fā)生器，可測定砷（As）、銻（Sb）、鍺（Ge）、碲（Te）等元素。一般靈敏度在ng/ml級（10－9），相對標準偏差2%左右。汞(Hg)可用冷原子吸收法測定。石墨爐原子吸收分光光度計，可以測定近50種元素。石墨爐法，進樣量少，靈敏度高，有的元素也可以分析到pg/ml級。</p><p style="text-indent:25px">原子吸收分光光度法常使用哪些定量分析方法?規(guī)范參加法：適用于試樣的基體組成復雜且對測定有明顯干擾時，但在規(guī)范曲線呈線性關(guān)系的濃度范圍內(nèi)的樣品。取四份相同體積的試樣溶液，從第二份起按比例參加不同量的待測元素的規(guī)范溶液．稀釋至一定體積。分別測定參加規(guī)范溶液后樣品的吸光度。以吸光度對參加的待測元素的濃度作圖，得到一條不經(jīng)過原點的直線，外延此直線與橫坐標的交點即為試樣溶液中待測元素的濃度。為得到較為精確的外推結(jié)果·應少用四個點來作外推曲線。需求留意的是，該辦法只能消弭基體效應的影響，而不能消弭背景吸收的影響，故應扣除背景值。原子吸收分光光度計基本結(jié)構(gòu)包括光源，原子化器，光學系統(tǒng)和檢測系統(tǒng)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="實驗室原子吸收分光光度計單價,原子吸收分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637419988246893719/5353894.png"></div><p style="text-indent:25px">原子吸收分光光度計的工作流程：以測定試液中鎂離子的含量為例，先將試液噴射成霧狀并引入到火焰中，含鎂鹽的霧滴在火焰溫度下，蒸發(fā)、離解成鎂原子形成原子蒸氣。當用鎂的空心陰極燈作光源，它便輻射出具有波長為285.2nm的鎂的特征光譜(波)，當其通過火焰中一定厚度的鎂原子蒸氣時，部分光被蒸氣中基態(tài)鎂原子所吸收而使強度有所減弱。通過單色器分光后被檢測器接受，檢測器測得鎂的285.2nm譜線光的減弱程度，進而即可求出試樣中鎂的含量。儀器應防止日光直射、煙塵、純凈氣流及水蒸氣的影響，避免腐蝕氣體的干擾。實驗室原子吸收分光光度計單價</p><p style="text-indent:25px">實驗臺：應鞏固穩(wěn)定，臺面平整。實驗室原子吸收分光光度計單價</p><p style="text-indent:25px">原子吸收光譜儀所檢測，導致吸光度值偏高：光譜背景除了波長特征之外，還有時間、空間分布特征。分子吸收通常先于原子吸收信號之前產(chǎn)生，當有快速響應電路和記錄裝置時，可以從時間上分辨分子吸收和原子吸收信號。樣品蒸氣在石墨爐內(nèi)分布的不均勻性，導致了背景吸收空間分布的不均勻性。提高溫度使單位時間內(nèi)蒸發(fā)出的背景物的濃度增加，同時也使分子解離增加。這兩個因素共同制約著背景吸收。在恒溫爐中，提高溫度和升溫速率，使分子吸收明顯下降。實驗室原子吸收分光光度計單價</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3188861.html</p></div></div></div></div></div><div id="ujl7smo" class="page-right twoColRt"><div id="cr7movc" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="bgdprdu" 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