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How to calculate concentration for swab cleaning analysis?

Question asked by chemist23 on Apr 26, 2020
Latest reply on Apr 27, 2020 by gabcaron

I trying to figure out how to obtain the concentration my result in mg/ml in a typical swab cleaning analysis.

 

Let's say

 

Area sample peak = 100
Area standard peak = 25
Weight of standard = 25 mg
Dilution vol of standard = 100 ml
Dilution vol of swab = 15 ml

 

Therefore

 

Conc. = (100/25) x (25mg/100ml) x (15ml/1 swab) = 15 mg/swab

 

Is this correct? I want to obtain conc. in mg/ml not mg/swab. How would I get mg/ml?

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