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center;">COD在線(xiàn)監測儀檢測分析COD的原理、結構及工藝流程</h1><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"><span style="font-size: 24px;"><strong>青島路博建業(yè)環(huán)?？萍加邢薰?/strong></span></p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"><span style="font-size: 24px;"><strong>廠(chǎng)家直銷(xiāo)</strong></span></p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"><span style="font-size: 24px;"><strong>LB-8040型在線(xiàn)COD監測儀</strong></span></p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"><span style="font-size: 24px;"><strong><img alt="" src="http://img75.chem17.com/2/20201103/637399945221306219115.jpg" style="cursor: default; height: 500px; width: 500px;"/></strong></span></p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"> <span style="color: rgb(102, 102, 102); font-family: verdana, arial, helvetica; font-size: 14px;">在COD、NH3-N這兩種常見(jiàn)的污水在線(xiàn)監測儀的使用原理進(jìn)行分析闡述的基礎上，意在說(shuō)明其所需的維護項目以及故障排除的方法，對實(shí)現在線(xiàn)儀的平穩運行，保證數據的及時(shí)有效起到一定作用。</span></p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"> </p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;">關(guān)鍵詞：在線(xiàn)監測使用和維護故障處理</p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;">　　1 前言</p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;">　　隨著(zhù)環(huán)境保護的日益重視，減少水資源的污染，已經(jīng)成為人類(lèi)生存、發(fā)展的重要控制環(huán)節，尤其是工業(yè)污水的達標排放，更是國家對工業(yè)生產(chǎn)、發(fā)展的首要前提條件。COD(化學(xué)需氧量)、NH3-N(氨氮)、油含量等指標是污水排放的重點(diǎn)監控指標。為了及時(shí)了解生產(chǎn)企業(yè)排放污水達標情況，中國石油的企業(yè)都要求安裝污水在線(xiàn)監測儀。裝bai污水在線(xiàn)監測儀安裝于排污單位的廢水排污口上，監測數據、儀器運行狀態(tài)等信息通過(guò)寬帶網(wǎng)或無(wú)線(xiàn)傳輸傳送到監控du中心并由監控中心實(shí)時(shí)監視現場(chǎng)儀器的運行情況，對現場(chǎng)儀器采集的監測數據進(jìn)行質(zhì)量控制和分析，將合格的數據存入數據庫。環(huán)境管理部門(mén)和企業(yè)可通過(guò)網(wǎng)絡(luò )查詢(xún)污染源的排污信息，并可根據信息調整生產(chǎn)和污染治理設施運行情況。所以在線(xiàn)監測儀器的使用，保證了污水排放數據的及時(shí)、準確和真實(shí)性，是環(huán)保工作必備的設備。在線(xiàn)分析儀在使用過(guò)程中會(huì )經(jīng)常出現故障，如何減少故障的發(fā)生率和及時(shí)排除故障與日常的正確使用和正確維護有著(zhù)直接的關(guān)系，這需要儀器使用者經(jīng)常對儀器進(jìn)行精心地維護和保養，在解決故障的日常工作中積累經(jīng)驗，實(shí)現在線(xiàn)儀的平穩運行，保證數據的及時(shí)有效。筆者在對COD(化學(xué)需氧量)在線(xiàn)監測儀和NH3-N(氨氮)在線(xiàn)監測儀的使用和維護中積累了一定經(jīng)驗的基礎上對其進(jìn)行綜合闡述，以此拋磚引玉，介紹給同行的用戶(hù)參考。</p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;">　　2 COD在線(xiàn)監測儀和NH3-N在線(xiàn)監測儀的工作原理和工藝流程簡(jiǎn)介</p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;">　　2.1 COD在線(xiàn)儀監測儀的原理、結構及工藝流程</p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;">　　水樣以重鉻酸鉀為氧化劑，以硫酸銀為催化劑，以硫酸汞為去氯離子干擾劑，在強硫酸介質(zhì)中消解回流氧化后，用硫酸亞鐵銨進(jìn)行滴定，滴定水樣中未被還原的重鉻酸鉀，根據消耗的硫酸亞鐵銨的量換算成消耗氧的質(zhì)量濃度CODcr。</p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;">　　反應式如下：Cr2O72-+14H++6e=2Cr3++7H2O</p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;">　　Cr2O72-+14H++6Fe2+→6Fe3++2Cr3++7H2O</p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;">　　<strong>LB-8040型在線(xiàn)COD監測儀</strong>為例，其結構分為分析部分元器件和控制部分元器件。主要包括：計量杯、電磁閥、蠕動(dòng)泵、冷卻風(fēng)扇、加熱杯、亞鐵銨滴定池、磁力攪拌器、冷卻水潛水泵、冷凝管、試劑箱等部分。</p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"><span style="font-size: 16px;"><span style="font-family: 微軟雅黑;"><strong>COD在線(xiàn)監測儀產(chǎn)品概述：</strong><br/>儀器采用重鉻酸鉀(K2Cr2O7)作為氧化劑測定出的化學(xué)耗氧量，即重鉻酸鹽指數。在強酸性溶液中，以重鉻酸鉀為氧化劑測得的化學(xué)需氧量。</span></span></p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"> </p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"><strong>LB-8040型在線(xiàn)COD監測儀</strong></p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"><strong><img alt="" src="http://img65.chem17.com/2/20200519/637254758208920862331.jpg" style="cursor: default; height: 500px; width: 500px;"/></strong></p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"><span style="font-size: 16px;"><span style="font-family: 微軟雅黑;">COD</span><span style="font-family: arial;"><span style="font-family: 微軟雅黑;">分析儀采用人性化的設計，使本產(chǎn)品較之同類(lèi)產(chǎn)品具有更低故障率、更低維護量、更長(cháng)的使用壽命以及更高的性?xún)r(jià)比和準確度。本儀器適用于化學(xué)耗氧量在 10～1000mg/L 范圍內且氯化物濃度低于 1000mg/L 的廢水在線(xiàn)自動(dòng)連續監測。</span></span></span><br/> </p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"><strong style="color: rgb(0, 0, 0); font-family: 微軟雅黑; font-size: 16px;">二、COD檢測儀測量原理</strong></p><p style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, "Trebuchet MS"; font-size: 13px; white-space: normal;"><span style="font-family: 微軟雅黑;"><span style="font-size: 16px;">樣品、重鉻酸鉀消解溶液、硫酸銀溶液（硫酸銀作為催化劑加入可以更有效地氧化直鏈脂肪化合物）、以及濃硫酸的混合液加熱到165℃，重鉻酸鉀被水中有機物還原為三價(jià)鉻，在特定波長(cháng)下測定三價(jià) 鉻含量，再根據三價(jià)鉻離子的量換算出消耗氧的質(zhì)量濃度（消耗的重鉻酸離子量相應于可氧化的有機物量）計算出 COD 值。還原性的無(wú)機物，例如亞硝酸鹽、硫化物和亞鐵離子，會(huì )提高測量結果，它們的耗氧量會(huì )加到 COD 值中。氯離子的干擾可以通過(guò)加入硫酸汞消除，因為氯離子能與汞離子形成非常穩定的。</span></span></p><p><br/></p><p> </p> </div> <div id="fvkfg1sxx" class="pge_re"> <span>上一篇：<a href="/news/show445859.html">便攜式油煙檢測設備技術(shù)要求</a></span> <span>下一篇：<a href="/news/show446310.html">對重鉻酸鉀法檢測COD常見(jiàn)問(wèn)題分析</a></span> </div> <style type="text/css"> .news_tag{margin-top:10px;} .ews_t_t{line-height:45px;margin:0px auto;font-size:16px;height:45px;overflow:hidden;color:#333;font-weight:bold;text-align: left;} .ews_t_tl{overflow:hidden;} .ews_t_tl a{float:left;color:#555;display:block;height:36px;line-height:36px;padding:0px 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