Table 2 Temperature programming of GF-AAS for the analysis of Cd, Cr, Pb, As and Se in tea leaves and soil samples
Stages | Cd temperature  °C, hold time (s) | Cr temperature  °C, hold time (s) | Pb temperature  °C, hold time (s) | As temperature  °C, hold time (s) | Se temperature  °C, hold time (s) |
|---|---|---|---|---|---|
Stage-1 | 150, 20 | 150, 20 | 150, 20 | 150, 20 | 150, 20 |
Stage-2 | 250, 10 | 250, 10 | 250, 10 | 250, 10 | 250, 10 |
Stage-3 | 500, 10 | 800, 10 | 800, 10 | 600, 10 | 600, 10 |
Stage-4 | 500, 10 | 800, 10 | 800, 10 | 600, 10 | 600, 10 |
Stage-5 | 500, 3 | 800, 3 | 800, 3 | 600, 3 | 600, 3 |
Stage-6 | 2200, 2 | 2300, 2 | 2400, 2 | 2200, 2 | 2200, 2 |
Stage-7 | 2400, 2 | 2500, 2 | 2500, 2 | 2500, 2 | 2400, 2 |