Standard Methods states that sulfate-reducing bacteria (SRB) typically grow within 2 to 7 days, although this may occur at any time between 2 and 21 days. How should bacterial growth that is observed after the 8 days listed on the SRB-BART bottle be counted?

Document ID

Document ID TE1755

Published Date

Published Date 27/05/2017
Question
Standard Methods states that sulfate-reducing bacteria (SRB) typically grow within 2 to 7 days, although this may occur at any time between 2 and 21 days. How should bacterial growth that is observed after the 8 days listed on the SRB-BART bottle be counted?
Summary
SRB-Bart Extended Testing Time
Answer
Hach consulted the BART manufacturer DBI (www.dbi.ca) and confirmed that the test can be extended beyond 8 days. Most customers do not because the colony count is so low at this point it is not of concern. The manufacturer stated that if the test were extended to 21 days and observed, then the population would be reported as less than 10 cfu/mL.