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- Posts: 6
- Joined: Wed Jan 14, 2015 11:02 pm
I'm having trouble figuring out how to calculate a gc result from my calculation.
this is my usual process to calculate the percentage of the substance.
Sample prep for example is 165.9mg of sample
20ml of meoh
50ul of sample / 950ul MeOH (1:20 dilution) into gc autosampler vial.
chemstation result is 100.0 ng/uL
100.0ng/uL = 100ug/mL x 20 x20ml/1000 = 40mg
40mg/165.9(sample weight) = 24.1%
What im having trouble with is that im being asked to determine the amount of a substance per 20g
my sample prep is the same as above
Sample prep for example is 325mg of sample into 20ml of meoh
50ul of above sample + 950ul MeOH (1:20 dilution) into gc autosampler vial.
my result is 18.37 ng/ul
Id like to see step by step how to convert the 18.37ng/ul to mg/20g
im sure its a simple conversion, but I must be missing something because my calculations arent making much sense.
thank you