Abstract: ⁹⁰Sr was obtained by HDEHP extraction from high level liquid waste. The decontamination factor for ¹³⁷Cs is about 800. The adsorption of ⁹⁰Y on polypropylene, polyethylene and glass was studied as a function of pH. For three materials, the effect patterns of pH on the adsorption of ⁹⁰Y are similar. The adsorption on the three materials are so small that can be negligible at pH<3. Glass has a strong adsorption ability compared with polyethylene and polypropylene. The adsorption percentage for polypropylene is higher than for polyethylene at pH<7 and the contrary is the case at pH>7. Therefore, in order to avoid the adsorption of ⁹⁰Y, it is better to choose polyethylene or polypropylene vessel and keep the pH of solution below 3 in the experiment related to ⁹⁰Sr-⁹⁰Y.