Abstract: In order to establish a new rapid determination method for trace chromium(Cr) in wheat flour,Nanyang color wheat was selected as sample. After the sample was treated by microwave program digestion,Crion with high valence state was deoxidized to be Cr3+ by sulfurous acid. Based on Cr3+ linear catalysis to Luminol-H2O2 chemiluminescence system,the total content of Cr in wheat was determined. The contents of Cr in the color wheat samples are between 2.211 mg/kg and 6.088 mg/kg. The linear correlation coefficient is 0.9988. The RSD of 5.0×10-8 mol/L Cr3+ is 4.5%(n=11). The lowest detection limit of Cr3+ is 3.75×10-11 mol/L. The recoveries in grey wheat are in the range of 93.66% to 99.09%. This method is fast and sensitive with good selectivity. So it can be used to determine the trace in wheat with satisfactory analytical results.

Key words: microwave digestion, flow injection chemiluminescence, color wheat, chromiumin