摘要
为了解化学性质与Eu相似的长寿命镧系和锕系元素在环境中的化学形态,用荧光衰减光谱法测定了N2环境下,在pH=5.3±0.1,离子强度为0.1mol/kgNaClO4条件下,Eu(Ⅲ)在氧化铝和胡敏酸氧化铝表面上的化学形态及Eu(Ⅲ)与胡敏酸的配位特性。研究结果表明,当胡敏酸被吸附到氧化铝表面上时,胡敏酸对Eu(Ⅲ)在氧化铝上的吸附具有很强的促进作用;在胡敏酸存在下,Eu(Ⅲ)在氧化铝上可能的吸附形态为:≡(Al—O)—Eu—HA+·(H2O)5和≡(Al—O)—Eu—HA+·(H2O)2。
The speciation of Eu(Ⅲ) on γ-Al_2O_3 is investigated by fluorescence spectroscopy study in the presence of alumina, humic acid and humic acid-alumina. The experiments are performed at 0.1 mol/kg NaClO_4, pH=5.3±0.1 and under N_2 atmosphere. The results show that sorption of Eu(Ⅲ) at HA coated alumina surface is strongly influenced by humic acid and the species of Eu(Ⅲ) is dominated by both alumina particles and humic acid sorbed onto the mineral surface in the presence of humic acid-alumina. The study of effect of humic acid on the sorption and species of Eu(Ⅲ) onto mineral surface is important to understand fully the behavior of Eu(Ⅲ), or its analogue trivalent lanthanides and actinides in environment.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2005年第2期108-112,共5页
Journal of Nuclear and Radiochemistry
基金
中国科学院"百人计划"资助项目(C03124025)
