How do you calculate the swab limit, once it has been extracted in solution?
In general the calculations go as follows:
swab limit (ug residue/swab) = acceptance criteria (ug residue/cm2) X swab area (cm2) X swab recovery (%)
acceptance criteria = ug residue/cm2 of a given residue
swab area = cm2 of area swabbed
swab recovery = the percent actually detected compared to a spiked surface area of known amount of residue (amount detected/amount swabbed X 100)
To convert swab limits to test result limits by converting ug residue/swab to ug residue/mL based on the extraction volume that is used to extract the swab for analysis.
The general equation is:
test result limit (ug residue/mL) = swab limit (ug residue/swab) / mL of extraction solution.
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