A determination of lead content in plant by microwaveheating and GFAAS

The best experiment conditions, accuracy and precision for determining the microamounts of lead content in plant by microwaveheating GFAAS approach were studied. Results indicated that the best acid system is 5 mL HNO33 mL H2O22 mL HF, the best microwaveheating condition is under the state of power 600 W、temperature 180 ℃ and microwaveheating 15 min.The optimal working condition of Graphite Furnace is the dried 45 s under 90 ℃, cineration 20 s under 900 ℃, atomized temperature 1 400 ℃ and cleaned temperature 2 500 ℃.The limit of detection of this method was found to be 0.068 4 mg/kg，the relative standard deviation error were in the range of 1.2%-5.6%，and recoveries were in the range of 95.81%-100.09%．