Determination of N,N-Dimethylacetamide in Water by Flow Injection Chemiluminescence

A method was proposed for the determination of N,N-dimethylacetamide (DMAC) by flow injection chemiluminescence, based on the fact that DMAC could enhance the chemiluminescence intensity of the KMnO4-Na2S2O3 system in an acidic medium. When the concentrations of H2SO4, KMnO4, Na2S2O3 solutions were 1.2, 5.0×10-4, 5.0×10-4mol·L-1, respectively, a linear relationship was found between the chemiluminescence intensity and the mass concentration of DMAC in the range of 0.20-40.0 mg·L-1, with detection limit (3S/N) of 0.071 mg·L-1. The proposed method was applied to the determination of DMAC in water samples, giving recovery rates obtained by standard addition method in the range of 97.3%-104% and RSDs (n=7) in the range of 1.2%-3.6%.