Table 1: The optimum instrumental conditions for determination of lead by AAS are as the following [14].
| Instrumental conditions for Pb measurement | |
| Wave length (nm) | 217.0 |
| Concentration unit | µg/ml |
| Lump current (mA) | 10 |
| Gas pressure | 30 |
| Air pressure | 60 |
| Slit width (nm) | 0.7 |
| Observation-height | 0.9 cm |
| Air flow rate (L/min.) | 21 |
| Fuel flow rate (L/min.) | 3 |