Improved routine method for the determination of total iodine in urine and milk.

A simple routine method for the determination of iodine in biological fluids is proposed. Destruction of organic matter by alkaline ashing is carried out prior to determination by the Sandell and Kolthoff reaction. The precision is below 8% for urine and milk. Iodine contents as low as 2 ng g–1(p.p.b.) can be detected.