The sorption/desorption of radioruthenium was investigated by the batch method in sea water system at ambient temperature
on the surface sediments obtained around the Daya Bay of Guangdong Province, where the first nuclear power station of China
has been running from 1994. It was found that the sorption percentage was obtained to be around 40% for all the surface sediments
in 60 minutes. Then, the sorption percentage goes up slowly. The sorption percentage of radioruthenium reached around 80%
in 113 days (2713 hours). The distribution coefficients decreased from 3.16·104 to 1.35·103 ml/g with the increasing of sediment concentration in the range of 4–10000 mg/l. The results of the desorption experiments
suggest that the sorption of radioruthenium is irreversible with 81.5% relative hysteresis coefficient.