DETERMINATION OF SULFUR DIOXIDE IN AIR BY FLOW-INJECTION CHEMILUMINESCENCE ANALYSIS

A novel chemiluminescence (CL) system coupled with flow injection technique was developed for the determination of sulfite based on the enhancement effect of sulfite on the chemiluminescence of luminol-H_2O_2-Cu~(2+) system. The method has the merits of higher sensitivity, higher selectivity, wider linear range, simpler instrumentation. Under optimum conditions, it is applicable for the determination of sulfite in range of 1.0×10~(-6)-8.0×10~(-9)mol/L,with a detection limit of 2.3×10~(-9)mol/L. The relative standard deviation was 2.7%for 11 measurements to 1.0×10~(-7)mol/L sulfite standard solution. The method has been successfully applied to determine sulfur dioxide in air by using sodium carbonate as absorbent material.