Add time:09/26/2019         Source:infona.pl

A novel and highly sensitive chemiluminescence (CL) method for the determination of dicyandiamide (DCD) has been developed based on the new CL system of N-bromosuccinimide–merbromin–cetyltrimethylammonium bromide in alkaline solution. Experiment conditions were optimized using central composite design-response surface methodology. Under the optimal conditions, the relative CL intensity was linear with the concentration of DCD ranging from 5.0×10−8gmL−1 to 3.0×10−6gmL−1. The detection limit, at the signal-to-noise ratio of 3, was 3.0×10−9gmL−1. The relative standard deviation was 1.9% for 11 repeated determinations of 1.0×10−6gmL−1 DCD. The proposed method was successfully applied to the analyses of DCD in tap water and milk products. And the recoveries were in the range of 87.0–102.3% with relative standard deviation values of 1.2–2.9%. Moreover, the minimum sampling rate was 120samplesh−1. The possible mechanism of the CL reaction was also discussed.

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