Microbiology test method of indoor air by exposed plates
good day dears:
I want to know how we can test the quality of indoor air by microbiology test . as i know we can use method test of exposed Agar petri dishes but i want to help me for more information about that test method and what the References.
thank you
From my experience processing these in a major micro lab in the UK, they are processed in the same way as any poured/streaked plates or the same agar. The plates should be exposed for 30 minutes for sampling and are then incubated at the required time/temperature (e.g. 72 hours@250 for Rose Bengal yeasts & moulds, 48 hours @370 for Plate Count Agar TVC)
good day dears :
I ask if we exposed petri dish for 30 minutes and the result was 15 colonies how we can calculate cfu/m3 kindly mention to references .
thanks
good day dears :
I ask if we exposed petri dish for 30 minutes and the result was 15 colonies how we can calculate cfu/m3 kindly mention to references .
thanks
Hi ahmed,
Afaik, settle plate data is currently more often used to calculate cfu/area/time.
Impaction techniques are commonly used if cfu/m3 values are required.
Nonetheless, a value for cfu/cm3 for yr settle plate data can be estimated via Omeliansky's formula as shown in this post 18 –
http://www.ifsqn.com...ria/#entry95042
(also see Post6/method2, Post17)
A reference illustrating use of the Omeliansky formula is attached.
Sedimentation with the Omeliansky formula,2012.pdf 44.61KB 58 downloads
thanks dear Charles.. best regards
Also see this recent post:
Indoor air test by exposed petri dishes