Abstract
Four types of pure cement hydration products such as C-S-H（Calcium Silicate Hydrate）, ettringite, monosulfate hydrate and calcium hydroxide are synthesized. Each of such products is dispersed and shaken in a solution containing trace elements such as Cr（VI）, As, Se, B, F and Al. Subsequently, the immobilization rate for each cement hydration product is determined based on the remaining amount of each element in the solution after shaking and filtrated. Consequently, it emerges that each trace element has its own characteristics in terms of the immobilization rate for cement hydration products：C-S-H tends to immobilize ‘Al’ well while ettringite excels in immobilizing ‘Se’ and ‘F’, monosulfate hydrate excels in immobilizing Cr（VI）, Se, B and F, and calcium hydroxide excels in immobilizing As, Se, F and Al.
