The study of chemiluminescence(CL)reaction of lucigenin-H

2

O

2

-ClO

-

system and the sensitization of acetone is reported.In basic medium

the ability of H

2

O

2

-ClO

-

is greater than that of H

2

O

2

or ClO

-

.Thus

H

2

O

2

-ClO

-

can quickly oxidize lucigenin and the CL intensity is increased.Acetone can increase the speed of CL reaction of lucigenin-H

2

O

2

-ClO

-

system and enhance the CL efficiency of above CL reaction

therefore

can raise the CL intensity.The sensitized CL intensity is proportional to the concentration of ClO

-

in the range of 1.25×10

-9

g/ml

-2

-2.0×10

-4

/ml.Many foreign ions do not interfere with the determination of CLO

-

Based on these results

we have developed a novel CL method for the determination of trace ClO

-

The detection limit of the method is 0.25ng/ml.