Determination of the Bromate in Water Based on 1,10-Phenanthroline Fade—Subtracted the Amount of Fe~(2+)— Spectrophotometry

The weight percentage of Fe2+ can be determined with 1,10-phenanthroline as chromogenic agent,and Fe2+ would be oxidized by bromate to Fe3+ and then 1,10-phenanthroline faded.Therefore,the content of bromate in water can be indirectly determined according to the stoichiometry amount of Fe2+.The linear range,detection limit,recovery,chromogenic conditions were studied and found that the recovery is 92.5%～108.7%,detection limit is 15～36 ng/L,the precision is less than 0.312.