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14px;">　　標準氣體發(fā)生器是將滲透管或擴散管作為氣體發(fā)生源來發(fā)生標準氣體的裝置。當滲透管和擴散保持在恒溫狀態(tài)時，單位時間和內(nèi)滲透量和蒸發(fā)量是恒定的。所以，將這兩種管子保護在恒溫狀態(tài)，將空氣和氮氣等稀釋氣體定量送入，就可連續(xù)發(fā)生微量濃度的標準氣體。氣體的濃度由該物質(zhì)的單位時間的滲透速度(蒸發(fā)擴散速度)及稀釋氣體的流量等基礎(chǔ)物理量決定，而一定規(guī)格的滲透管(擴散管)的滲透速度(蒸發(fā)擴散速度)可以用減重法得到:故這種方法具有很高的可信度。具體的裝置如下圖所示。<br/><br type="_moz"/></span></div><p style="text-align:center;"><img src="https://img43.chem17.com/9/20240402/638476600008571761869.png" width="236" height="257" align="middle" alt="標準氣體發(fā)生裝置介紹"/><br/> </p><p style="text-align:center;"><img src="https://img43.chem17.com/9/20240402/638476600564067187833.png" alt="標準氣體發(fā)生裝置介紹"style="width:800px;"/></p><p><br/></p><p><br/></p><p><br/></p><div><span style="font-size: 14px;">　　</span><strong><span style="font-size: 14px;">利用滲透管發(fā)生標準氣體</span></strong></div><div><span style="font-size: 14px;">　　滲透管是在特定質(zhì)量的氟化樹脂管內(nèi)封入高純度的液化氣體所制成的，當保持在一定的溫度下時，管內(nèi)的液化氣體將從管壁向外滲透，并且在單位時間內(nèi)，其滲透的量保持不變。所以，只要保持一定的溫度，并通入一定量的稀釋氣體，就可以獲得一定濃度的校正用標準氣體。由于可以通過滲透管重量的減少和稀釋氣體的流量來計算標準氣體的濃度，所以這種方法的準確性很高。而且是動態(tài)的氣體發(fā)生方法，可以發(fā)生氯氣，硫化氫，氨等化學性質(zhì)很活潑的氣體。滲透管的種類很多(如下表所示)而且能發(fā)生多種穩(wěn)定的標準氣體，所以有著廣泛的用途。滲透管法被日本的「惡臭防止法實施規(guī)則」以及厚生勞動省公布的「勞動環(huán)境指導方針」所認定。在美國也被NIST「美國國立標準技術(shù)研究所」和EPA「美國環(huán)境保護廳」作為標準法認定。<br/><br type="_moz"/></span></div><p style="text-align:center;"><img src="https://img46.chem17.com/9/20240402/638476600941154400379.png" width="314" height="313" align="middle" alt="標準氣體發(fā)生裝置介紹"/></p><p><br/></p><p style="text-align:center;"><img src="https://img47.chem17.com/9/20240402/638476601204675375307.png" alt="標準氣體發(fā)生裝置介紹"style="width:800px;"/></p><p><br/></p><p style="text-align:center;"><img src="https://img43.chem17.com/9/20240402/638476601427072782650.png" width="236" height="234" align="middle" alt="標準氣體發(fā)生裝置介紹"/><span style="font-size: 14px;"><br/></span></p><div style="text-align: center;"><span style="font-size: 14px;">擴散管</span></div><div style="text-align: center;"><span style="font-size: 14px;">　　適用于單一成分校準氣體制備<br/><br type="_moz"/></span></div><p style="text-align:center;"><img src="https://img48.chem17.com/9/20240402/638476601772511205163.png" width="236" height="235" align="middle" alt="標準氣體發(fā)生裝置介紹"/></p><div style="text-align: center;"><span style="font-size: 14px;">　　多成分用擴散管<br/><br type="_moz"/></span></div><div><span style="font-size: 14px;">　　稀釋劑等溶劑含有多種物質(zhì)。以往的方法只能制備單一物質(zhì)的校準氣體，用多種成分用擴散管，可同時制備4種物質(zhì)的校準氣體。可提高分析工作的效率。</span></div><p><br/></p> </div> <div id="b88wmiw" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-3656661.html">檢測管和檢測器具</a></li> <li>下一篇：<a href="/Article-3639605.html">常用色譜柱-石化行業(yè)篇</a></li> </ul> </div> </div>   <div id="b88wmiw" class="pc_foot"> <div id="b88wmiw" class="pc_ft_main w1100"> <div id="b88wmiw" class="ft_list"> <ul> <li> <b>產(chǎn)品中心</b> <a 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