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- Posts: 162
- Joined: Fri Jun 22, 2012 2:51 pm
I'm taking a second look at my lab's QC for 8260... we have a 6890/5973 with a purge & trap, which we use mostly for soil samples. Our P&T stir motor is broken so rather than just placing the soil into a vial with a stir bar, we extract 5g of soil into 5ml of methanol and spike a 40 ml voa of DI water with the extract.
Currently, to do an MS and MSD we add the spiking solution to the water in the 40 ml voa after the sample extract. This seems weird to me... I'm not sure what it tells us that a CCV doesn't. Would it make more sense to spike the soil itself?