question from dummy - Chemstation - ESTD

Question

Hello everyone, thank you for this support forum. 
 I am new to Agilent and Chemstation software and i need some tips. 
 I set the method and put values in calibration table. 
 After the sample rum the report shows me Ret Time, Area, Amt/area and Amount %. If I have understood correctly: 
 Area is the sample Area 
 Amt/area is the calibration factor from calibration table (mass_standard / Area_standard) 
 Amount % is Area * Amt/Area 
 
 The EN standard that i have to use indicates that in order to calculate the result I have to make this calculation: 
 Result%= (sample_Area*F*100)/(sample_mass*4) 
 or simplifying 
 Result%= (sample_Area*F*25)/(sample_mass) 
 
 Now the question is: where to insert *25? in multiplier? 
 And if I wanted the software to do the complete calculation where would I enter the sample mass? in the sample info before starting the analysis? 
 I tried with no result... please help!

giopeco · Accepted Answer

SOLVED! 
 it needs to be set ESTD% and not ESTD. 
 At this point the system calculates the result by multiplying by RF, Multiplier, Dilution and dividing by the sample amount. 
 Thank Andy Wright for your answer and help. You are right that using ESTD% the multiplier should be divided by 100 (in my case *25 becomes *0.25)

Andy Wright · Answer

Hi giopeco 
 The sample mass could go in the Sample Amount column in the sequence table. Chemstation will then divide the result by thins value, but will also multiply the result by 100. 
 In that case, a multiplier of 0.25, equivalent to your "divide by 4" in one of the formulae that you show would do the job. 
 /Andy

question from dummy - Chemstation - ESTD

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