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將微(wei)(wei)(wei)(wei)生(sheng)物(wu)(wu)膜(mo)緊固于隔膜(mo)式氧(yang)電極上即(ji)組成微(wei)(wei)(wei)(wei)生(sheng)物(wu)(wu)電極,儀器采用(yong)(yong)流(liu)(liu)通(tong)(tong)測量(liang)方式,由流(liu)(liu)通(tong)(tong)測量(liang)池(chi)組件固定微(wei)(wei)(wei)(wei)生(sheng)物(wu)(wu)膜(mo)。由于氧(yang)電極的(de)輸出(chu)電流(liu)(liu)與(yu)溶(rong)(rong)(rong)(rong)解(jie)(jie)氧(yang)的(de)含(han)(han)量(liang)成正(zheng)比,當不(bu)含(han)(han)任(ren)何有(you)機物(wu)(wu)的(de)液(ye)體(ti)(緩沖溶(rong)(rong)(rong)(rong)液(ye))通(tong)(tong)過流(liu)(liu)通(tong)(tong)池(chi)時,微(wei)(wei)(wei)(wei)生(sheng)物(wu)(wu)的(de)同(tong)化作用(yong)(yong)很小,因而流(liu)(liu)經(jing)微(wei)(wei)(wei)(wei)生(sheng)物(wu)(wu)膜(mo)的(de)溶(rong)(rong)(rong)(rong)解(jie)(jie)氧(yang)幾(ji)乎沒有(you)減少(shao)。當含(han)(han)有(you)有(you)機物(wu)(wu)的(de)溶(rong)(rong)(rong)(rong)液(ye)通(tong)(tong)過流(liu)(liu)通(tong)(tong)池(chi)時,微(wei)(wei)(wei)(wei)生(sheng)物(wu)(wu)的(de)同(tong)化作用(yong)(yong)變的(de)異常活躍,消耗更(geng)多的(de)溶(rong)(rong)(rong)(rong)解(jie)(jie)氧(yang),于是導致流(liu)(liu)經(jing)微(wei)(wei)(wei)(wei)生(sheng)物(wu)(wu)膜(mo)的(de)溶(rong)(rong)(rong)(rong)解(jie)(jie)氧(yang)量(liang)減少(shao),這種溶(rong)(rong)(rong)(rong)解(jie)(jie)氧(yang)含(han)(han)量(liang)的(de)變化,直接(jie)使氧(yang)電極的(de)輸出(chu)發生(sheng)同(tong)比變化,即(ji)輸出(chu)電流(liu)(liu)變化值與(yu)樣(yang)品有(you)機物(wu)(wu)的(de)含(han)(han)量(liang)成正(zheng)比的(de)關系,就此計(ji)算出(chu)BOD值。
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