Abstract: A method for the determination of chromium in food by ionic liquid -graphite furnace atomic absorption spectrometry was established. The sample was directly dissolved in 1-butyl-3-methylimidazolium chloride （[Bmim]-Cl） and added with 0.5 mL nitric acid. The pretreatment process could be completed within 5 minutes. The solution was directly detected by graphite furnace atomic absorption spectrometry. Chromium has a good linear relationship in the range of 2.58~20.64 μg/L, under the optimized spectral conditions, the detection limit of chromium is 0.04 mg/kg, the recovery of standard addition is 92.00%~101.65%, RSD is 4.11%~6.69%. The pretreatment method is green and safe, easy to operate and fast to process, and has a wide application prospect.

Key words: hydrophilic ionic liquid, 1-butyl-3-methylimidazolium chloride, graphite furnace atomic absorption spectrometry, chromium