BOD sample hold time

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BOD sample hold time

Postby sreed » Wed Mar 19, 2014 9:55 am

The hold time for BOD samples in SM5210B, 2001, 4.a.(1): "In no case start analysis more than 24 h after grab sample collection." If the sample is a composite, it's to be treated in the same manner as a grab. The maximum hold time listed for BOD analysis under Title 40, 136.3 table II is 48 hours. I've always thought the hold time to be 48 hours. I would like to know if I am to follow the more stringent requirement of the method, as I am updating my laboratory SOPs and I want to get this right!

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