By Anonymous on Sunday, June 8, 2003 - 08:31 am:
I would like to know the general formula for calculation of quantification of any residual solvent when analysed by GC HS thru external standard method.
For example, If standard concentration used is 0.8 mg per mL of Methanol and sample used is 500 mg in 2 mL of Solvent.Assuming a Purity of 100% for standard Methanol, what would be the formula for calculating the amount of methanol(ppm) in the sample.
By Anonymous on Monday, June 9, 2003 - 05:20 am:
Sample concentration is 250mg/mL
MeOH Std conc is 0.8mg/mL ( = 0.32% )
[Area of Methanol peak in sample divided by Area of Methanol peak in std] multiplied by 0.32 gives the weight percent of methanol in sample
0.1% equals 1000ppm