Dear Carlo
Now I'm not sure that Walter miss understanding or not ?,
First time we develop MRM method following Bangkok lab and when Dr. Andre (Agilent Application ) came to traning at hear , he has set all new MRM method and we used his method to develop until now and this method which can not detected at 10 ppb because used miss tuning .
If you have not confirm with he , please confirm to he again.
Now , I'm very worry .