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iydmllvh"> <div class="xcnuscvg_fl">發布時間：2022-04-01</div> <div class="xcnuscvg_fr">瀏覽次數：210</div> </div> <div class="new_con"> 　　總有機碳分析儀采用紫外過硫酸鹽氧化法測定液體樣品中的總有機碳，然后采用非色散紅外吸收法檢測二氧化碳。該分析儀可測量液體樣品中的TOC，范圍為0-5mg/L至20000mg/L。該方法符合EPA、DIN、CE、ASTM和Namur法規，并符合ISO和EN標準的要求。<div>　　1.監測結果比實際結果小很多。</div><div>　　分析：</div><div>　　1）由于空氣當中的CO2溶入水中，造成IC測量值偏高，TOC值降低；</div><div>　　2）由于分析儀器長時間使用沒有洗干凈，內壁附著了碳酸鹽；</div><div>　　3）苯酚溶液配得不標準。</div><div>　　2.所用的氧氣的作用。</div><div>　　分析：</div><div>　　1）用作載氣，將水樣帶入儀器內部；</div><div>　　2）用作助燃氣，將含C化合物中的C變為CO2。</div><div>　　3.在檢測水體中有機物的含量時，TOC法相比COD法的優點。</div><div>　　分析：</div><div>　　1）比起COD的滴定和反滴定操作，TOC法自動化程度高，操作簡單，分析速度快，只需3min就可以得到結果；</div><div>　　2）TOC通過監測C的含量來監測水體受污染的情況，其監測結果直指有機物的污染程度，而COD通過監測水體中還原物質的含量來監測水體受污染情況，不能夠確定是有機還原性物質還是無機還原性物質，所以TOC比COD的干擾要小，準確度要高；</div><div>　　3）TOC可以檢測幾乎所有的有機物，氧化率約100%，監測精度高，而且儀器進行封閉監測，其監測狀態基本不被人為改變，監測結果偶然誤差較??；而COD監測需要手動操作，引起偶然誤差的因素增多，監測結果的可靠性降低。</div><div>　　4.監測海水單位體積耗氧量是多少，選擇高錳酸鉀的原因。</div><div>　　分析：</div><div>　　海水的鹽分大，水中的有機物質含量較多。儀器雖然精度高，但其對監測條件也有嚴格要求，利用在線監測儀來監測海水，可能對儀器的內部構造有所損壞（如鹽附著在燃燒管內壁等）。同時由于海水中雜質含量較大，即使使用精密度不高的COD法來進行監測，其相對誤差也不會很大，所以選擇高錳酸鉀法來監測。</div> </div> <div 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