Abstract: The effect of surfactant on the chemiluminescence(CL) that Pb(II) catalyses luminal-1,10-phen-H2O2 is studied.Based on Tween-20, a new CL method for determining trace Pb(II) is proposed. there is a linear relationship between the intensityof CL and concentration of Pb(II) in the range of 1×10-6～1×10-4mg/ml; the detection limit of method is 2.5×10-7mg/ml forPb(II);the RSD is 1.9%.The method has been applied to the determination of lead in Calcium propionate with satisfactory results.

Key words: flow injection chemiluminescence, surfactant, lead, calcium propionate