What requirements are there for a BOD5 to be valid?
BOD5 requirements: • The instrument must be calibrated as per manufacturer’s instructions if using a dissolved oxygen meter to measure dissolved oxygen. • A Blank must be run that meets the criteria of the method or data must be qualified when reporting results. • A glucose-glutamic acid standard or a similar known standard must have been analyzed to show the system is capable of producing a valid result. • The sample must deplete a minimum of 2 mg/l with a final D.O. of 1.0 mg/l. For 300 mls of sample that does not meet this criteria the results are reported as less than 2.0 mg/l or the mdl.
