Acridine Red Spectrophotometric Determination of Trace (IO_3)~- based on Formation of Associated Particles

摘要

Under the conditions of HCl-KI, acridine red (AR) has a max absorption peak at 540 nm, the max absorption peak of acridine orange (AO) at 480 nm. When there is (IO_3)~-, it reacts with excessive I- to form (I_3)~-. The AR and (I_3)~- all combine to form an association particle that caused the absorption decreasing. (IO_3)~- concentration in the range of 5-90×10~(-7) mol/L can be determined by the pectrophotometry.