Acetone carrover post Purge and trap Refurb EPA524/ 8260

[ttpp823]

Hello,

We recently had a refurb done on our OI analytical Purge and trap system for drinking waters. Previous to the refurb, the system had quenched acetone responses on the high end of the curve but little carryover (less than 2ppb) of acetone and small amounts of carryover of the end compounds ie. naphthalene. The range of the curve for acetone is 10-200ppb, all others .5-40ppb. After the refurb where the transfer line, trap, and sparge tube were replaced, we ran an ICAL. The curve was good for Acetone. However, after the HCAL the first blank has about 15ppb of acetone. Has anyone seen this before? We tried doing front inlet maintenance again but to no success. I did do a test with increased bake time but that was also unsuccessful.
We do a 40:1 split ratio. I am, unfortunately, not allowed to change that. Any suggestions would be greatly appreciated.

[MichaelVW]

When I had an Archon and P&T from the same era, I expected roughly that amount of acetone contamination (and a little naphthalene carryover). The newer Evolution/Centurion was better but acetone blanks were rarely completely blank, and I never went above 100 ppb for a cal.

Can you try more / larger / warmer sparge tube rinses between samples?