Abstract
It was found that ZnSe quantum dots(QDs) could enhance the chemiluminescence(CL) of the luminol-K3Fe(CN)6 system.The CL from luminol-K3Fe(CN)6-ZnSe QDs system is strongly inhibited under the presence of hydroquinone.Based on this inhibition,a novel CL method with a lower detection limit and wider linear range was developed for determining diethylstilbestrol.The possible CL mechanism was also discussed.Under the selected experimental conditions,the CL intensity was linear with the concentration of diethylstilbestrol from 6.0×10-9 mol/L to 4.0×10-5 mol/L with a detection limit of 2.0×10-9 mol/L(S/N=3).The relative standard deviation(RSD)(n=11)for the determination of 4.0×10-6 mol/L diethylstilbestrol was 1.4%.The proposed method was successfully applied to analyze diethylstilbestrol in milk samples with recoveries of 94.47%~107.61%.
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