Ka aunoatia e te tātari te tikanga whakapūngao dichromate paerewa. Ka tangohia he tauira wai i ia wā, ka tāpirihia he nui tika o te whakapūngao pāhare pākawa dichromate (K₂Cr₂O₇) me te waikawa whanariki kukū (H₂SO₄) me te hiriwa sulfate (Ag₂SO₄) hei whakakorikori, ā, ka whakamahana i te ranunga hei whakatere i te whakapūngao. I muri i te nakunaku, ka inehia te dichromate e toe ana mā te colorimetry, te potentiometric titration rānei. Ka tatau te taputapu i te kukū COD i runga i te kai whakapūngao. Ka whakauruhia e ngā tauira matatau ngā tauhohenga nakunaku, ngā pūnaha whakamatao, me ngā kōwae whakahaere para mō te haumaru me te tika.
Awhe Taupānga:He pai mō ngā wai para me te COD i roto i te awhe 10~5,000mg/L me te kukū pūhaumāota iti iho i te 2.5g/L
Ngā Tikanga Whakamātautau:Te nakunaku pāhare pākawa dichromate i te pāmahana teitei, te whakatau tae
Te whānuitanga ine:10~5,000mg/rita
Te āheinga ki te whakahoki anō:10%, 6mg/L rānei (Tangohia te uara nui ake)
Atanga tāuru:Huri rahinga
Atanga putanga:Te mahi i roto i te whare; pāmahana 5-28℃; haumākū whanaunga ≤90% (kāore he hauhautanga, kāore he tomairangi)
