Extraction of acetanilide herbicides in naked oat (Avena nuda L.) by using ionic liquid-based matrix solid phase dispersion-foam flotation solid phase extraction.

The herbicides in naked oat (Avena nuda L.) samples were extracted, separated, and determined by using ionic-liquid-based matrix solid-phase dispersion-solvent flotation coupled with high-performance liquid chromatography. The experimental parameters were optimized and evaluated by a univariate method and orthogonal experiment. A good linear relationship was obtained in the range of 5-5000 mu g/kg, and the linear correlation coefficient are between 0.9989 similar to 0.9993. The quantification limits for alachlor, metazachlor, propanil, acetochlor, pretilachlor, metolachlor, and butachlor are 5.03, 2.62, 2.73, 4.58, 7.28, 5.05, 5.78 mu g/kg, respectively. The average recoveries of the acetanilide herbicides at spiked concentrations of 10, 100, and 500 mu g/kg ranged from 92.1 to 104.7%, and relative standard deviations were equal to or lower than 2.9%.