Kev thov cov pa oxygen kuj tseem hu ua chemical oxygen xav tau (chemical oxygen xav tau), hu ua COD. Nws yog siv cov tshuaj oxidants (xws li poov tshuaj permanganate) los oxidize thiab decompose oxidizable tshuaj nyob rau hauv dej (xws li organic teeb meem, nitrite, ferrous ntsev, sulfide, thiab lwm yam), thiab ...
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