Abstract: To determine trace chromium in food preservative calcium propionate made of eggshell to prove it’s reliability,we adopted chemiluminescence method and graphite furnace atomic absorption spectrometric (GFAAS)method to compare the obtained results. It was showed that results of the two methods were rapid simple,little interference and fine reproducibility. By chemiluminescence method the detection limit was1.5×10-12g/ml and the linear range 1×10-10～1×10-6g/ml. By GFAAS the same results were 1×10-12g/ml and 0～1×10-6g/ml respectively.

Key words: food preservative, calcium propionate, chromium(Cr), chemiluminescence, graphite furnace atomic absorption spectrometric(GFAAS)