~(90)Y在不同材料器壁上的吸附性能

用HDEHP萃取法从高放废液中提取了90Sr,对137Cs的去污因子约为800。以90Sr-90Y为示踪剂,在不同pH条件下对90Y在聚丙烯、聚乙烯、玻璃等材料管壁上的吸附进行了研究。结果表明,在pH=0~10范围内,3种材料的管壁吸附90Y的变化趋势基本一致。当pH3时,90Y在3种材料上基本不吸附;当pH3时,90Y在3种材料上均有较大的吸附,且在玻璃上的吸附远大于在聚丙烯和聚乙烯上的吸附;对于聚丙烯和聚乙烯2种材料,当pH7时,90Y在聚丙烯上的吸附大于在聚乙烯上的;pH7时,情况相反。根据实验结果,在90Sr-90Y的实验中,应尽量选用聚丙烯或聚乙烯作为容器,且溶液的pH值应小于3。

Adsorption of ~(90)Y on Experimental Vessel Wall

~(90)Sr was obtained by HDEHP extraction from high level liquid waste. The decontamination factor for ~(137)Cs is about 800. The adsorption of ~(90)Y on polypropylene, polyethylene and glass was studied as a function of pH. For three materials, the effect patterns of pH on the adsorption of ~(90)Y 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 ~(90)Y, it is better to choose polyethylene or polypropylene vessel and keep the pH of solution below 3 in the experiment related to ~(90)Sr-~(90)Y.