[en] In order to determine trace levels of rhenium in plant samples by ICP-MS, a pretreatment method was developed. Ten radish samples (Raphanus sativus L.) grown in solution culture containing ¹⁸⁴ReO₄^- were used. The samples were separated into three parts (leaves, fleshy root and fine roots), then each sample was oven-dried at 60 deg C. The Re loss ratios in the samples after incineration at 450 deg C for 3 hours and acid leaching at 90 deg C for 3 hours were compared. There was no difference of recoveries among the sample parts, and throughout the procedure, almost 100% Re was recovered from the samples. (author)