Could you help me with my PAHs test problem?
Posted: Sun Nov 02, 2008 8:08 pm
I use these six PAH internal standards as surrogate. I got six surrogates recovery increasingly high in some soil samples. For example, the recovery of the first three surrogate were around 80-90%, the forth one went up to 120%, the fifth one were 150%, and eventually, the sixth one went up to 200%, 300% sometimes. We don't do PAH soil and water sample cleanup. We use SIM mode. These surrogate peaks looks in good shape.
I suppose it's because of matrix interference, because most time these problem happened with dark sample(few times but still had sometimes happened with clear sample). But, how come interference could have the same RT and same ions with these deuterated compounds?
Can someone give some idea?
I suppose it's because of matrix interference, because most time these problem happened with dark sample(few times but still had sometimes happened with clear sample). But, how come interference could have the same RT and same ions with these deuterated compounds?
Can someone give some idea?