Since iodine concentrations vary considerably amongst different
foods, diets and natural products (Koutras, Matovinovic, &
Vought, 1985), the analytical procedures employed are generally
chosen according to sample matrix, the (expected) iodine level
and speciation and/or the costs associated with the analysis. A
method frequently used for biological matrices is the catalytic
spectrophotometric determination of iodine as I based on
Sandell and Kolthoff (1934) following one of numerous ways of
sample digestion