-
- Posts: 5328
- Joined: Thu Oct 13, 2005 2:29 pm
- Location: Maun Botswana
Mr.Brown wrote:Peter Apps wrote:
Earlier you mentioned dirt in the liner, which presumably came from earlier samples (it cannot have come from blanks and solvent injections). This suggests some history - what samples and how many have been run through the system previously ?
Peter
thats hard to tell but since the last liner change, roughly 300 samples (headspace, t-BME extracts from food samples, some standards,...)
I rinsed now the injector with acetone and n-hexane and backout once more 500°C for 1 h (with liner inside, and septa, as suggested by ATAS GL technician)
300 samples is a lot between liner changes. The headspace samples will not have deposited crud in the inlet, but if they were in an aqueuos matrix the water vapour might have hydrolysed the column phase to some extent. Certainly food extracts will crud up an inlet in short order, and there is a good chance that some heavy muck is sitting on the first couple of metres of the column.
Do you have replacement inlet liners and'or a spare column that you can test ?
Peter