I have a question. I loose the sensitivity of C35-C40 standards. I usually inject a standard mix (C21-C40) but over the time I loose the high chain length carbons. Either I see very little peaks or I see nothing. If I inject the low carbon chain standard mix (C8-C20) I have no problem at all, I have the same sensitivity over the time. Could anyone help me what to do?
Thanks a lot