some questions regarding drift calculation in GC
Posted: Mon Nov 06, 2006 11:50 am
Dear all
I was trying to calculate the drift in concentration from day to day basis as given in SW846 EPA but my calculation gives me negative answer.
can area of the standard can be taken for calculation?
I mean to say today i make new standard a suppose 1ppm(Single point cal)and inject and getan area.Then next day inject the same standard and get the area. From this can i use the formula
(First day area-2nd day/first day)*100
SW846 says
theoritical concentration -calculated concentration /theoritical concentration
please send me some suggestion
I was trying to calculate the drift in concentration from day to day basis as given in SW846 EPA but my calculation gives me negative answer.
can area of the standard can be taken for calculation?
I mean to say today i make new standard a suppose 1ppm(Single point cal)and inject and getan area.Then next day inject the same standard and get the area. From this can i use the formula
(First day area-2nd day/first day)*100
SW846 says
theoritical concentration -calculated concentration /theoritical concentration
please send me some suggestion