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src="http://www.chem17.com/mystat.aspx?u=sanbon"></script>  <div id="b913rxf" class="ly_crumb"> <img src="/skins/170979/images/crumb_icon.png" /><p>當前位置：<a href="/">首頁</a> > <a href="/article.html">技術文章</a> > <span>溶氧儀測量數值不穩定的原因分析</span></p> </div>   <div id="dhrzbrf" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">溶氧儀測量數值不穩定的原因分析</h1> <div id="b7r1dlp" class="NyNewsdetail_tips">更新時間：2021-07-29 點擊次數：5355</div> <div id="9zrh9ll" class="NyNewsdetail_con"> <div>　　<a href="http://www.ztgbb.cn/ParentList-432782.html" target="_blank">溶氧儀</a>是根據電化學原理，即在含氧的被測電解質溶液中的兩個不同金屬電極上，將產生氧化還原反應，由此生成的擴散電流和溶液中的氧濃度呈一定關系的原理制作的測量水中氧氣含量的儀器。也有的儀器采用伏安測定中的極譜法，對溶液中的工作電極施加電壓后，其生成的極譜圖上的電流與溶液中的被測物質濃度呈一定關系的原理制作。<br /> </div><div>　　溶氧儀測量數值不穩定的原因分析：<br /> </div><div>　　1、進行溶氧儀測量時，不能將溶解氧探頭直接放入曝氣中的污水池中;<br /> </div><div>　　2、如果機器帶有氣壓補償需要查詢當地的海拔氣壓輸入儀器才能顯示正確數值;<br /> </div><div>　　3、溶解氧與溫度有關系，標定時溶液溫度盡量與測量溶液溫度相同，以提高測量精度;<br /> </div><div>　　4、曝氣池溶解氧變化量很大，可能會出現測試結果(零氧或滿氧)需具體情況具體分析，必要時需要在已知水樣中確認電極是否正常后才能下結論。<br /> </div><p align="center"><img src="https://img78.chem17.com/9/20210729/637631712183413545348.jpg" alt="溶氧儀" width="500" height="426" align="middle" /></p><p> </p><div>　　標定：測量前用飽和濕空氣(或平衡水)對溶氧儀進行標定。若測量值與用亨利定律計算的理論值相吻合，則可以使用，否則應進行檢查。用亨利定律計算出常見壓力、溫度范圍內的水中氧飽和溶解度。<br /> </div><div>　　極化：極譜法要求每次更換膜或電解液后，必須對電極進行極化。所謂極化，就是去除極譜室內電解液中殘存的溶解氧，使溶解氧向陰極表面遷移時產生的“本底電流”減小到零。這時，為通過原點的直線，所以極化又稱為調零點。具體做法是將電極放入現配制的無氧水溶液(0.01 mol·L-1硼砂水溶液與無水亞硫酸鈉配成1%～2%亞硫酸鈉溶液)，約10 min即可。</div> </div> <div id="xtlnhbd" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-2732153.html">談談差壓變送器正負遷移的問題</a></li> <li>下一篇：<a href="/Article-2725413.html">溶氧儀的零氧校準液是什么，如何制備？</a></li> </ul> </div> </div>   <div id="1vvj3fv" class="ly_foot"> <div id="3vt5rbh" class="ly_Ftmain"> <div id="xhbb3fd" class="ly_FtLeft"> <div id="dfhdbh1" class="Ft_nav"><a href="/">首頁</a><a href="/aboutus.html" target="_blank">關于我們</a><a href="/products.html" target="_blank">產品展示</a><a href="/news.html" target="_blank">新聞中心</a><a href="/article.html" 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