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Table 2

Storage and maximum holding time of samples (APHA 2012)

Parameter nameStorageMaximum storage
BOD Preferable to analyse as soon as possible. Otherwise refrigerate (<6 °C) in the dark 48 hours 
COD Preferable to analyse as soon as possible. Otherwise acidify with sulphuric acid to pH < 2 and refrigerate (<6 °C) in the dark 28 days 
Colour Refrigerate (<6 °C) in the dark 48 hours 
pH Analyse immediately Determine in situ if possible or upon arrival at laboratory 
Turbidity Refrigerate (<6 °C) in the dark Up to 48 hours 
Parameter nameStorageMaximum storage
BOD Preferable to analyse as soon as possible. Otherwise refrigerate (<6 °C) in the dark 48 hours 
COD Preferable to analyse as soon as possible. Otherwise acidify with sulphuric acid to pH < 2 and refrigerate (<6 °C) in the dark 28 days 
Colour Refrigerate (<6 °C) in the dark 48 hours 
pH Analyse immediately Determine in situ if possible or upon arrival at laboratory 
Turbidity Refrigerate (<6 °C) in the dark Up to 48 hours 
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