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If the counted colonies, (n
) exceeds the number of sampling head holes
f
(n
), then the equation will fail and the results cannot be trusted. If this is the
h
case, then the sample dish can be considered as overloaded with micro-
organisms and the user should consider lower sampling volumes.
The colony concentration is the corrected count per volume of air sampled.
The results are normally expressed in colony forming units per cubic metre.
To convert the corrected count to CFU/m
3
use the equation:
n
CFU
= 1000.
c
3
m
V
s
Where n
is the corrected number of colonies counted and V
is the sampled
c
s
volume in litres.
Spreadsheets to automate the correction process and to collate and present
results are available for free download from:
https://www.cantiumscientific.com/support/information
Alternatively, use our on-line tool to determine corrected counts and CFU by
visiting:
https://www.cantiumscientific.com/membership/count-correction
16
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