Rapid Determination of Sodium Saccharin by FI-Chemiluminescence

FI-Chemiluminescence determination of sodium saccharin based on the CL reaction between luminol and H2O2 was reported. In an acid medium, the solution of sodium saccharin was reacted with K2Cr2O7 to reduce Cr(Ⅵ) quantitatively to Cr(Ⅲ) and the CL intensity of the reaction system was remarkably enhanced by the Cr(Ⅲ) formed. The content of Cr(Ⅲ) was then determined and converted into contents of sodium saccharin. Linear relationship between values of increase in CL intensity and concentration of sodium saccharin was obtained in the range of 5.0×10-7-1.0×10-5mol·L-1. Detection limit (3s) was found to be 1.08×10-11mol·L-1. Recovery was tested by addition of standard solutions at 3 concentration levels to sample solutions, values of recovery obtained were in the range of 95.6%-105.8% with RSD (n=12) of 2.9%.