Abstract
Using a radioactive tracer, 131I, analytical procedures were examined for the determination of iodine in rock samples by radiochemical neutron activation analysis using shortlived 128I According to the present results, iodine is easily lost during the preparation of reference standard samples unless iodine solution is efficiently alkaline (pH>10) and/or they are dried in a short time (e.g, ca. 30 min at 50 °C under a heat lamp) . It was confirmed that no iodine was lost when samples were soaked with conc. KOH solution containing iodine carrier, dried on a hot plate (ca. 100 °C) and then fused with a meckel burner. The revised procedures proposed here are expected to work effectively for the determination of ultra trace iodine in rock samples.
