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class="art-info"> 發(fā)布時(shí)間： 2022-03-09　　點(diǎn)擊次數： 880次 </div> <div id="ssoiekc" class="art-body"> <span style="color: rgb(102, 102, 102); font-family: "PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif; font-size: 14px;"> 　　五日生化需氧量(BOD5)是一種用微生物代謝作用所消耗的溶解氧量來(lái)間接表示水體被有機物污染程度的一個(gè)重要指標。其定義是：第5天好氧微生物氧化分解單位體積水中有機物所消耗的游離氧的數量，表示單位為氧的毫克/升（mg/L）。BOD5測定儀是利用電子差壓傳感器替代汞壓差法來(lái)測量生化需氧量，采用無(wú)汞法，減少了對實(shí)驗人員的傷害；結合手機app，可顯示BOD5數值的變化曲線(xiàn)，直接顯示BOD的mg/L數據。</span><br style="color: rgb(102, 102, 102); font-family: "PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif; font-size: 14px;" /><br style="color: rgb(102, 102, 102); font-family: "PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif; font-size: 14px;" /><div style="margin: 0px; padding: 0px; list-style: none; border: 0px; color: rgb(102, 102, 102); font-family: "PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif; font-size: 14px;">　　<a href="http://www.5757576.com/Products-36536039.html" target="_blank" style="text-decoration-line: none;">BOD5測定儀</a>輕松實(shí)現五日生化需氧量的測量<br /> </div><div style="margin: 0px; padding: 0px; list-style: none; border: 0px; color: rgb(102, 102, 102); font-family: "PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif; font-size: 14px;">　　首先將放大器置于培養箱內，并按預先選擇的量程及測量范圍，定量體積的水樣倒入培養瓶，放在放大器上連續攪拌。培養箱內溫度控制在20℃±1℃，水樣恒溫后進(jìn)行五日培養。培養瓶中必須保證足夠的溶解氧。</div><div style="margin: 0px; padding: 0px; list-style: none; border: 0px; color: rgb(102, 102, 102); font-family: "PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif; font-size: 14px;">　　樣品中的有機物經(jīng)過(guò)生物氧化作用，轉變成氮、碳和硫的氧化物，在這一過(guò)程中，從水樣中跑出來(lái)的一氣體二氧化碳被氫氧化鈉（或氫氧化鉀）吸收。因此瓶中空氣壓力減少量，相當于微生物所消耗的溶解氧量，這樣樣品BOD5值與瓶中空氣壓力減少的程度成正比，通過(guò)測量空氣壓力的變化可以得到BOD5值。</div><div style="margin: 0px; padding: 0px; list-style: none; border: 0px; color: rgb(102, 102, 102); font-family: "PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif; font-size: 14px;">　　增加或減少所取樣品的量可以增加或降低壓力減少值。這樣操作者無(wú)須繁雜的稀釋步驟就能準確測量很寬范圍的BOD5值。培養瓶中空氣壓力的變化是通過(guò)半導體壓力傳感器來(lái)進(jìn)行檢測的，經(jīng)過(guò)信號放大和微處理機的運算處理，由六位數碼顯示器循環(huán)顯示各樣品的BOD5值，并由打印機打印出數據，實(shí)驗結束后可打印出完整的生化反應曲線(xiàn)。</div><p align="center" style="margin: 0px; padding: 0px; border: 0px; color: rgb(102, 102, 102); font-family: "PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif; font-size: 14px;"><img src="https://img73.chem17.com/9/20220309/637824222823063111228.jpg" alt="BOD5測定儀" width="500" height="500" align="middle" style="margin: 0px; padding: 0px; border: 0px; max-width: 100%; max-height: 1000px;" /></p> </div> <div id="2m0goeu" class="art-next"> <dl class="shangxia"> <dd>上一篇：<a href="/Article-2908000.html">原來(lái)便攜式明渠流量計堰槽的安裝有這些要求</a> </dd> <dd>下一篇：<a href="/Article-2952106.html">國標COD消解器加熱時(shí)可以任意調控加熱功率,使用方便</a> </dd> </dl> </div> </div> </div> </div> </div> </div> <div class="i0mio20" id="clear"></div>  <div id="0iakes0" class="sy_footer clearfix"> <div id="20amg2c" 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