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- 12. Methods Parameter Method Nitrite concentration Colorimetric method Nitrate concentration UV spectrometric screening method Total iron concentration Phenanthroline method Total hardness EDTA titrimetric method Dissolved oxygen Winkler method Total solids Gravimetric method Heavy metals Atomic absorption spectrometry Chemical oxygen demand Open reflux method Biochemical oxygen demand 5-day BOD test Total Coiform and E.coli Multiple fermentation tube method