Abstract:

This paper describes a method for the determination of iodine in table salt using iodate-fluorescent yellowsurfactant
system. The conditions for the oxidation of fluorescent yellow by potassium iodate in acetic medium were studied.
The system had a maximum absorption at 438.5 nm in the medium of acetic acid. Beer’s law was obeyed in the range of
0.40–3.00 mg/L of iodine. The molar absorption coefficient was 4.31×104 L/(mol·cm) with a correlation coefficient of
0.999 0. The precision expressed as relative standard deviation (RSD) was in the range of 0.83%–1.47%, and the recoveries
were in the range of 98.1%–98.4%. This method is simple, rapid, accurate and precise, and has been successfully used in
determination of iodine in table salt.

Key words: fluorescent yellow, fade spectrophotometric method, surfactant, iodine, table salt