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A novel selenium nanoparticles (Se NPs)-amplified chemiluminescence (CL) reaction, Se NPs–potassium permanganate–dinitrobutylphenol (DNBP), for the determination of DNBP at gram per milliliter level is described. In the present study, it was found that direct reaction of DNBP with potassium permanganate (KMnO₄) in the acidic mediums elicited light emission, which was greatly enhanced by selenium nanoparticles. Under optimum conditions, the CL intensity is linearly related to the concentration of DNBP in the range of 1.0×10⁻⁷–8.0×10⁻⁵gmL⁻¹ with a detection limit (3σ) of 3.1×10⁻⁸gmL⁻¹. The relative standard deviation for 11 determinations of 2.5×10⁻⁵gmL⁻¹ DNBP is 2.07%. The Se NPs were prepared by the chemical hydrothermal method. It was found that catalytic properties of Se NPs were higher than those of microparticles (MPs). In addition, scanning electron microscopy (SEM) and X-ray …