A simple,sensitive and accurate method was developed for the determination of lead ion by taskspecific temperature-assisted ionic liquid with flame atomic absorption spectrometry. The main factors affecting the extraction efficiency,such as p H value,amount of ionic liquid and hydrochloric acid ultrasonic extraction time,were studied. The optimal conditions were as follows: p H value was set at 5. 99,the concentration of ionic liquid was 80 mg/m L,the extraction time was 30 min,the ice bath time is 30 min,a...