Abstract:The graphite furnace atomic absorption spectrophotometry （GFAAS）coupled with the suspension injection method was established to determine the chromium in the edible gelatin.During suspension preparing，the effects of gelatin particle size，the amount of surfactant，and the ratio of sample weight to constant volume on the detection results were studied.The choice of matrix modifier was discussed，the heating program of GFAAS was optimized.The studies showed that addition of a surfactant was not necessary，when the constant volume was 10 mL，the suspension prepared by weighing 0.30 g-0.35 g gelatin with particle size less than 0.15 mm was most suitable for detection.Magnesium nitrate was selected as the matrix modifier，the optimal detection condition of GFAAS with the ashing temperature of 1 500 ℃ and atomization temperature of 2 200 ℃.Under the optimal conditions，the method detection limit was 0.001 mg/kg，the relative standard deviation of the test was less than 5 %，the recoveries were between 95 % and 115 %.The method was simple，effective and rapid for the determination of chromium in edible gelatin.