A study on the association of two iodine isotopes,of natural127I and of the fission product129I,with soil components using a sequential extraction procedure

Sequential extraction techniques have been utilized in order to investigate the degree of binding or association of natural iodine¹²⁷I and the radioactive iodine isotope¹²⁹I with soil components. The results indicate that only a small fraction of natural iodine (2.5–4%) but a large fraction of the recently added radioactive¹²⁹I (38–49%) is water-soluble. The other forms of iodine which were determined for both iodine isotopes were exchangeable iodine, iodine bound to metal-oxides and iodine bound to organic matter.