Currently our lab owns an AA800 Graphite Furnace. We anlayze various trace metals by EPA Method 29, which requires a filter digestion using HNO3 and HF. We have found that when we use the recommended conditions for the different steps in the analysis program, we receive a 0% spike recovery and a lower than usual concentration on a known concentration.
Is there anyone out there using an AA800 and have had difficulty analyzing Be in a HNO3/HF solution? Not sure what the drying, pyrolysis, and atomization should be in the method. The recommended conditions do not work.
I currently have:
Temp: Ramp: Hold:
100 5 50
120 30 10
1500 1 5
2400 0 5
2500 1 5
Sample at 10µl, Diluent at 14µl
Matrix modifier at 5µl Mg(NO3)2