@inproceedings{oai:repo.qst.go.jp:00053673,
 author = {Nakamaru, Yasuo and Tagami, Keiko and Uchida, Shigeo and 中丸 康夫 and 田上 恵子 and 内田 滋夫},
 book = {Waste Management Symposium Proceedings},
 month = {May},
 note = {To understand Se adsorption behavior in acid soils, soil/soil solution distribution coefficient (Kd) was obtained for 58 Japanese agricultural soil samples using Se-75 as a tracer. It was found that the Kd-Se values, ranged from 12 to 1060 (arithmetic mean =315), were highly correlated to the soil active-aluminum (Al) and active-iron (Fe) contents. Those two components were considered to be the major adsorbents of Se in Japanese soils. The mechanism of Se adsorption by the active-Al and active-Fe is regarded to be ligand-exchange, which is the same adsorption mechanism for phosphorus (P). Therefore, using a modified sequential extraction procedure proposed for soil adsorbed P, the adsorbed Se-75 was extracted from 12 selected soil samples. In this procedure, we employed 1 mol/L NH4Cl, 4 mol/L NH4F and 0.1 mol/L NaOH for extracting loosely bound Se, active-Al bound Se and active-Fe bound Se, respectively. The results showed that 80-100% of the adsorbed Se was recovered as active-Al and active-Fe bound forms. The loosely bound Se was less than 2% of the total amount of Se sorbed on each soil. The active-Al bound Se was the dominant form in the soils that had higher Kd values, while the active-Fe bound Se was the dominant form in the soils that had lower Kd values. Therefore, we considered that the higher values of Kd-Se were mainly caused by the sorption on active-Al.},
 pages = {1--7},
 title = {Using a sequential extraction procedure for selective determination of soil-adsorbed Se},
 volume = {30},
 year = {2004}
}