A method for the determination of iodine in plants is described. This method involves destruction of organic matter by alkaline incineration and automated spectrophotometric determination of iodide based on the Sandell and Kolthoff's reaction. The mean recovery of 131I was 93.4% (S.D. = 3.19)). For replicate analyses of different plant material, the coefficient of variation is between 3 and 5%.