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將微(wei)(wei)生(sheng)(sheng)物(wu)(wu)膜(mo)(mo)緊固(gu)于隔膜(mo)(mo)式氧(yang)(yang)電(dian)(dian)極上即組(zu)成微(wei)(wei)生(sheng)(sheng)物(wu)(wu)電(dian)(dian)極,儀器采用(yong)流(liu)通(tong)測量方式,由流(liu)通(tong)測量池組(zu)件固(gu)定微(wei)(wei)生(sheng)(sheng)物(wu)(wu)膜(mo)(mo)。由于氧(yang)(yang)電(dian)(dian)極的(de)(de)(de)輸(shu)(shu)出(chu)電(dian)(dian)流(liu)與溶(rong)解氧(yang)(yang)的(de)(de)(de)含(han)(han)量成正(zheng)比,當不含(han)(han)任何有(you)(you)機物(wu)(wu)的(de)(de)(de)液(ye)(ye)體(緩(huan)沖溶(rong)液(ye)(ye))通(tong)過流(liu)通(tong)池時,微(wei)(wei)生(sheng)(sheng)物(wu)(wu)的(de)(de)(de)同(tong)(tong)化作用(yong)很小,因(yin)而流(liu)經微(wei)(wei)生(sheng)(sheng)物(wu)(wu)膜(mo)(mo)的(de)(de)(de)溶(rong)解氧(yang)(yang)幾(ji)乎沒有(you)(you)減少(shao)。當含(han)(han)有(you)(you)有(you)(you)機物(wu)(wu)的(de)(de)(de)溶(rong)液(ye)(ye)通(tong)過流(liu)通(tong)池時,微(wei)(wei)生(sheng)(sheng)物(wu)(wu)的(de)(de)(de)同(tong)(tong)化作用(yong)變(bian)的(de)(de)(de)異常活躍,消耗更(geng)多的(de)(de)(de)溶(rong)解氧(yang)(yang),于是導(dao)致(zhi)流(liu)經微(wei)(wei)生(sheng)(sheng)物(wu)(wu)膜(mo)(mo)的(de)(de)(de)溶(rong)解氧(yang)(yang)量減少(shao),這種溶(rong)解氧(yang)(yang)含(han)(han)量的(de)(de)(de)變(bian)化,直接使氧(yang)(yang)電(dian)(dian)極的(de)(de)(de)輸(shu)(shu)出(chu)發生(sheng)(sheng)同(tong)(tong)比變(bian)化,即輸(shu)(shu)出(chu)電(dian)(dian)流(liu)變(bian)化值與樣(yang)品有(you)(you)機物(wu)(wu)的(de)(de)(de)含(han)(han)量成正(zheng)比的(de)(de)(de)關(guan)系,就此計算出(chu)BOD值。
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