Department of Analytical Chemistry and Environmental Control, Hot Laboratory Center, Atomic Energy Authority, Inshas, Cairo, Egypt.
Environ Pollut. 2010 Oct;158(10):3077-84. doi: 10.1016/j.envpol.2010.06.035. Epub 2010 Jul 24.
The adsorption behavior of 241Am, 60Co, 137Cs and 85Sr in the presence and absence of chelating ligands (ethylenediaminetetraacetic acid, ethylenediaminediacetic acid, hydroxyethyliminodiacetic acid, iminodiaceiticacid and methyliminodiacetic acid) was investigated. Sorption affinity in the absence of chelating ligands followed: Am(III)>Co(II)>Cs(I)>Sr(II). The presence of chelating ligands generally had little effect on sorption of 85Sr and 137Cs with Kd values 110 and 690 mL g(-1), respectively. But at 0.02 M of ethylenediaminetetraacetic or hydroxyethyliminodiacetic, the Kd decreased to 5 or 63 mL g(-1), respectively, where thermochemical modeling indicated almost all 85Sr is complexed with these ligands. The Kd values for 241Am and 60Co generally decreased with increasing chelating agent concentrations. In notable cases, the Kd values for Am increased at specific concentrations of 10(-3) M for IDA, MIDA and 10(-4) M for EDDA. This is proposed to be due to formation of a ternary surface complex.
在存在和不存在螯合剂（乙二胺四乙酸、乙二胺二乙酸、羟乙基二亚氨基二乙酸、亚氨基二乙酸和甲基亚氨基二乙酸）的情况下，研究了 241Am、60Co、137Cs 和 85Sr 的吸附行为。在不存在螯合剂的情况下，吸附亲和力的顺序为：Am(III)>Co(II)>Cs(I)>Sr(II)。螯合剂的存在通常对 85Sr 和 137Cs 的吸附影响不大，其 Kd 值分别为 110 和 690 mL g(-1)。但是在 0.02 M 的乙二胺四乙酸或羟乙基二亚氨基二乙酸存在下，Kd 值分别降至 5 或 63 mL g(-1)，其中热化学模拟表明几乎所有的 85Sr 都与这些配体形成配合物。241Am 和 60Co 的 Kd 值通常随螯合剂浓度的增加而降低。在一些显著的情况下，在 10(-3) M 的 IDA、MIDA 和 10(-4) M 的 EDDA 特定浓度下，Am 的 Kd 值增加。这被认为是由于形成了三元表面配合物。
