Yesterday I did check one of the two part syringes without the black rubber plunger and they were much cleaner, but instead of what looks like heavy hydrocarbons or paraffin wax, they are contaminated with heavy amides, major masses of 59 and 72. After looking at the masses from the first syringes with full scan I am beginning to think that it is silicon oil instead of paraffin because the major masses are 73, 207, 281 and 96.
I was doing 525.3, 530 and 541 for UCMR4 back in the summer and the syringes worked fine for the drying step, now I can't even see the internal standards on a SIM run. I will probably just order some of the 10ml SPE reservoir tubes to make cartridges, although I found that UCT has some 5g ones for less than $4 each. Has anyone here had any experience with the DryDisks from Horizon? I have seen those demonstrated but not sure if they are super clean and how expensive they would be.
I have used the pasteur pipettes before for small scale cleanup, but I need 4-5g of sodium sulfate to remove all of the moisture from the extracts so I don't think I can get any large enough for this project. They are perfect though to make a silica gel column for 1ml extract cleanup for waste waters though.