Umwuka wa ogisijeni ukenewe, uzwi kandi nko gukoresha ogisijeni ya chimique, cyangwa COD muri make, ukoresha okiside ya chimique (nka potasiyumu dichromate) kugirango uhindure kandi ubore ibintu bya okiside (nkibintu kama, nitrite, umunyu wa ferrous, sulfide, nibindi) mumazi, hanyuma gukoresha Oxygene ni calcu ...
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